FOODS AND GROWT}I OF JUV.NILE COHO SAIiON
oNocaHYEHus iI$UTCH (1L4LB&uM), AND CHI!)OX SALMON
O}OO
TS3CI(WALBAUM) IN CE1T&IN O&FGON STRIA3
.&AOND K;1I1 BiEt3ER
A fliJ5I$
OREGON STME COLIGE
lASTER OF SCIENCE
APPROVED:
Redacted for privacy
a a a.. aie*e.f ** a a aa a a a a a . a .'a., a
Profeazor of Fish oz4 Game
a
a a a . a -a a * a
a a. a * II
iaesint
Head of Departent
in Charge of Lajor
Redacted for privacy
#
-.--- .. a a a a ama. S . a a-a* a a a* a * a a a a a aa a Saaa. a
OhaiiSehoote Cüttee
Redacted for privacy
Dean of Graduate School
Date theei5
pid by HiL3a Lyare
Septmbr 3, 3960
ACKNODGL2INTS
Snoere appreciation 5.s expreaed to the bio1ogist3 ot the Fish
Cuiieeion ot Oregon who aided in collecting the samples of fish and
those the assisted with the original planning of the study,
The collections
ere nade by personnel from the Bay City,
Charleston and Clackamas laboratories, and £roxm the Sandy River and
Willanette River hatcheries.
(jp';]
. . .. . . . . . . . . . a a a a s ..a . a a * e a a . .
INTRC1IJCTION
Notes onLiee HlBtory
ITHOD8OF c&ITIX.1 D&T&
8APLI1AREA.8
3.
2
. . . . . . . .
. .
.
. ... . . . . . . .. .
a..a.saaa.ae*aaaó.aas.aIa.Ia*aa
S
6
..............a...
9
FOODSaa.a.a..a.aa.aaaaa......a...a...a....a......a...
:i.
...aa..a..aaa..aa...a..aaa..a..
3.1
Diet Ccposition
Sea*onal variations n diet . a .a a a a a . a a .
Food and Stream: F1ow
.....
a..aaa a.aaaaa
aaa
aaaaa
25
Foodandize Groups oFish
27
Food Weignt
.a..aaaa.aaa.aaa.....
ae.,aaa.aaaaaaaaaea.ai.a.asaaa.a..a
30
t3QWTJj INL}lTH
aa.....aaoa.....a..aaa.aa.....a..a.aa
37
3.953. Brood
37
aaa'Iaaa...sa.a.,..a.a*.a.ap.S.Ø..
1j9
Ana3yis oL Length Data .. a a a a.. a a a. a .. a a a a . a a a
53
a.aaaaa*aa.aIaa...aaasae.a**a**a
58
1952 Brood
GBL)WTH INWE]flHT
s.pa..a.a...ae.i.a..aaa..aaaaaa.
1952 Brood .a.a.....a,..a...aa.,...s......aa.....
CONDITION FACTOR a..aaa..a,...aa.......a.a.a.a.I....a
ThA.RY AID CO!LU5IONS . .... a... *a a a a a a a a .....
BLIOGR&PHY aaaa.a*.a...aa..aaas.a.aa.a.aa..
1951 Brood
. .
APINDUa a.... . a. a
a a a a a. . a.. a.. a a a a a. a .a.a .a a a a a a.
58
61
67
76
79
83.
LIST OF IYU)IES
PACE
I
I]
JMLTRS CF FISH Y AGE GROTJ? COLCEOTiD
ArTfl
i..a satus&ad
rqi'
tA
.
PERC1NT?J3 CGk?CSITION BY NC$i'R OF F.:OD IT1S OF YOUNG
COO AND CHINOOK SALa. N DURIO A 16-MONTh SAM?LINt} PERIOD
fl
III 5A}LING DATA EROM COHOS COLLEC1LD AT 3-HOUR INVWtLS
FRO
LLR2O
CREEK DURING 2k-HOUR PERIOD.................
22
XY VAThR IEMPERATUHES AND STOMACH ANALYSIS OF FISH
TMEN AT 3-HOUR INTERVALS LRJrtn A ZI .HOUR SA]Lflfl
PERIOD IN £ARQN CREEK .... ..... . .. .. .. . ... . . . . .. .. . ....
2i.
E RATING OF FOOD GROUPS I REUTION TO IRCENT&GES
V
BY MJLERS IN TUE STQM&CH CONTENTS .....................
VI
COMPARISON OF FOOD PREFEREIE BY TO AGE ClASSES OF COlIC)
SAIGN FOR THE PERIOD OF ARCH TO JUNE 153 *
NUMBERS ARE PERCENTAGES OF TOTL IMS 'EATEN ...........
29
VII DRIED FOOD WEHTS OF STOMCB CONTENTS FROM COHOS AND
OF
CHINOOKS OF THE 193. BROOD SHOWN AS A PERCENTAC
PII3IR'[D risn HEIGHTS . . ... . .
1
.. .
. . .. ...
30
VIII iLID FOOD WEIGHTS FROM STOMACH CONTENTS OF THE 1%2
BROOD COHO AND CHINOOK SAIliON SHOWN AS A PERCENTAGE
OF i-fl FISHEICHT
32
XI RELTIVE AMCUNTS OF FOOD FRO TO BROOD .ORS DURING
COJARABLE aL!LiNo PEiIODS.
S-'L.
3,
i.aKEi ONE
X LAN LENGThS AN]) iEIGHIS, AMD NCN SMPLiNG )AT.iS OF THE
19S1 BRCOD !EAR COHO AND CHINOOK SALM.N ................
II MEtN MOWIHLY
ENG1MS OF 1%i BROOD COlIC) AND CHINOOK SkUON
147
***'*
&.?.L
'"
-
r
L:II$;;
tLI
XIII
XIV
ii
.v;
I
.
IL
I
I[ZK
Z
AN I1IS AND WEIGHTS, AND ILMPLINC} L&TES OF THE
19BROODMBCOHOANDCHINOOKSAIliON................ 1-2
MI MONTHLY LENGTHS OP JHE 1952 BROOD JUVENILE
COHOANDCHINOOKSALMON................................
4
LIST OF
&BL
(GONTINUE])
TABLE
XV
MOflTHL! LEIt! ICREMiTS IN MiLLILIETERS, TOTAL IN1
NILY PIOD3 OF
GROu11I, AND 1EM IE?TH GROH FOR
E19S2BROODCOHOANDCItNCOKSAThO11...............
Xvi
RLY GROWTH INCR&2NTS iin LàN MNTffLY FOOD
QuAiTrrIEs.
3II
. . ............ ... .. . .... ... .. ... ... . . ....
TLY ME&N RELATIVE FOOD QU&NTITBS AND GROT.C1J
INCREflNL5(WThEJUVENII2SThEANCOHO$..............
XVILI 1!TN UITHLY
bA.L Oh a
XIX
.
IGHTS OF THE 1951 BROOD JUVENILE
a
a a *
a a . a
.. a a
a
N ONWL WEFHTS IN GA5 OF
bRU )D
a a a S a a S S S 5 0 5
a S S S
;!LI'J a
a S S
a
a a a a a
a.
8
TE 1952
a a a
a a a a a a
a a a a
TN LONTHLY RELTIVE FOOD QUANTITIES AND WEAN RIT!S O'
1%2
RGYTh (YE
VTffIT.
XXII
57
LiEPN RElATIVE FOOD QUANTITIES AND MEA1 RAS OF GROWTH
IN WEIONT FOR. THE 1251 3R00D STREk COHO COMPUTE]) FRO!
AN LONHLY WE1DH
XX
XI
5.5
ALJJ
OM MONTHIJT
OOB COHOS, COLPUTED
MJMBERS ARE PERCENTAOS ...............a
Ccl J1TIO FACTOR OF 1O-MILLflLTER
i
.z.,,,c.
a. a a. a a
a . a a
. a
itOU!
OF Ti
. a . a a.. a a. a
a *
s *s S
6
APPENDD
List of Tabis
Pt.GE
AIALiSIS OF ST3ACH CON
1:TS OF COW) SM2ON FROi
LARSOI; OREK, TR1 JT&RY OF COOS
y, ARPANGED
ACCCRDThO TO TINE PERIODS, SE OF FISH, A
MAJOR
TYPES OF OROANIS1 FMEN
PERIOD OF NOYE.EER 26,
1952 TOiARCH 7,
II
81.82
ALA.LSIS CF STSLCU CuNT8 OF COW) 3AW0N FEOIL
1AiSoN CREEK, TRD3UTA.RY OF COOS B&X, ARR&MIEI)
ACCORDING To TIME PRIQD5, SUE OF FISH, AND
JOR
TYPES OP OBGLNISL EAN. PERIOD OF Z&RCH U TO
,flJ1E 2.0, 1953
III
ANA.LIS
OF
..s...................e.........,...
STOMACH COFZS C
838b
00130 SAI2iON FROM
IARSoU CREEK,
UDUT&RY OF COCA BY, ABJ4MDED
ACC(DIM TO Tfl PERIODS, SUE OF FISH, AND MAJOR
TYPES OF ORGNIS13 EAN. PERIOD OF iU1 17, 1%3
TO SE2 ER 16, 1953
I
V
8586
. . . . . . . . . . -
ANA.L!SIS OF ST MACH COFiEl$ OF 00110
I2ON FROM
LARSON CREEK, TRISUTMtY OF COOS B&Y, ARR&IGED
A000RDIMI T TIME PERIODS, SUE OF FISH, AND MkJOE
TYPES OF ORGANISMS FA'rEN, PERIOD 0? SEPTEMBER 23,
1953 TO DECEMBER 16, 1953 . . . . . . . . . . . .. . . . . . . . * * . .
87.88
ANA.L1IS OF STOMACH COWENTS OF COW) SALMON FR
IARSOII CREEK,
UTA.RY OF COOS BA.!, ARRA.NGETJ
ACCORDING TO T11E PERIODS, SUE OF FISH, AND MAJOR
TYPES OF ORGANI&1 E&iEN. PERIOD OF DECEER 23,
1953 TO ILA.RCH 1'!, .195I
VI
.
a
. a a a a a a a a a
a a a
a a .-* a
AN&LYSIS OP STOMACH CONTENTS OF 00110 SAUON FROM
UNSN CIK, 1BI13JTA.RY OF TIIWLOOK R111TR, A1.NGED
ACCORDIMI TO TINE PERIODS, SIZE OF FISH, JND JJOR
TYPES OF OROLNISL EA.N, PERIOD OF JA1'WARI 7, 1953
j)(?T' 11
1It'
J, £L'.JI
.1.J.
4.77J ..........*I.*.....aa..a.*..I
Tflr\
8990
m
VII ALIS CF STO1tCH COFiENTS OF COW) SLLON FROM
ThON CREEK, TRIBUTART OF TtUAW)OK RIVER, LRRi43ED
ACCORDING TO U1Z PERIODS, SIZE OF FISH, AND 1JOR
TYPES OF OR UISL8 EATEN, PERIOD OF MARCH 17, 1953
Tu JUNE 10, 1953
a
#!3LIur]ILz
zzxzzzzzzzzz.
9394
APPENDIX - Continued
L
o
Tables
TABLE
IX
AN ANALYSIS OF STUACH CONTENTS OF 00110 SALMON FECiI
!fIJNE3ON CW.EK, TEITT&R! OF TILLAMOOK RIVER,
ARL9AED ACCORDING It) TIME P1IODS, SIZE OF FIS}i,
AND MAJOR ¶LYPES OF ORGANISMS EATEN. PERIOD FROM
SE?Z1TR , 1953 TO DECBER 16, 1953 ..........
ATh Of TiACH CO LINT
97-98
OF cairo SAI2I')N FRr
MUNSON CR7EK, TRIBUTARY OF TILIMEOOK RIVER,
AN:1D A000RI)INO Tu TLU PERIODS, SE OF FISH
AND AJ
TyPE r. OANIS EATEN.
PFRTOD OF
ECtJi 23, 1953 TO ArRIL 7, 1951 ...............
XI
99-100
ANALYSIS OF SM.CH CON:NT$ OF COHO SAi3N YOUNG
ABRNTHY C11EK, TRIBURY OF IMET
RIVEI', AERANOED ACCORDING TO TIME PER1th)S, SIZE
OF FISH AND MAJOR TYPES OF ORGANISMS IAflN *
P'IoD OF NOVEl
19, 1952 TO i}X 11, 1953.. . ..
XII
101-102
ANALYSIS OF STOLIACH CONTENI OF 00110 SAiON YOUNG
F?.OM ABERNETh! CREEK, ThIBUTARY OF WILIMiIETTE
R3YEH, AIthANOND ACCORDING 10 TIME
IOD, SIhE OF
FISH AND MAJOR TYiS OF ORGANISMS EATEN. PERIOD OF
MARCH18, 195.3 TO JUNE 10, 1953 .................. 1O3-l0.
bl
ilL
I
.
,
I
pJ
I
I
*
XIV
XV
:1
.
/LlS IS OF STOMACH CONTENTS OF 00110 SALMON YOUNG
FROE AEERNEB! CREEK, 11IITARY OF WIIJAMET'IE
RIVER, AflANBD ACCORDING TO TIME PERIODS, SIZE
OF FISH AND MAJOR TYPES OF ORGANISMS EATEN. PRIOD
OF SE?ThMBER 23 1953 TO DECEMBER 9, 1953 ........
10?
ANALYSIS CF ST...MACli CoNTENTS OF COHO SAI2LoN YOUNG
FBOi ABERNETdY CREEK, 1tDJTARY OF WIIAI$?1 RIVER,
AkME.i) ACCORDING It) TDiE PERIODS, SIZE OF FISH
AND MAJOR TYPES OF ORGANISMS EATEN, PERIOD OF
FEBRWtRYIS, 17, &2I,1951s..,...................
XVI
ANALYSIS :I4'
10
0ONT.T5 OF 00110 SkUoN PROM
CE]1R CREEK, TR3]3U TAR! OF SANDY RIVER, ARRANGED
ACCORDING TO T
iERIODS, SIZE OF FISH AND MAJOR
T!PES OF CUANI2MS EATE.N
PERIOD OI 10EU13ER 10,
1952 TO MAIH lO, 1953
109-110
122
........
1953 15, NOVEMBER TO 1953 5, NOVEMBER OF
PERIOD EATEN. ORGANISMS OF TYPES MAJOR &UD P1511,
OF SIZE PERIODS, TIME 1) ACCORDING AiRANCED RIVER,
W1LUJETTE THE OF FORK MDDI THE FROM SAWOLT
CHINOOK YOUNG CF CONTENTS STOMACH OF ANALYSIS
............
.. .
xxrv
JE
12O-I2
193 17, 3irTELB TO 193 25,
OF PERIOD EATEN. ORI.IANISMS OF TiPES MA.JOR AND
FISH OF SIZE 2ERIODS, TIME TO ACCORDING ARRANGED
RIVER., WIL1ALETTE THE OF FORK tIIODLE T}TE PROM SAI1dCN
CHINOOK
!CU OF TENTS C COCH
OF ANALYSIS
*. .
XXIII
....
.............. i93
16, SCPT/R TO 193 19, JUNE
?IOL)
EAThN. b 1 ORCA OF TYPES NAJQR AND
FISH CF S1E PIBIODS,
TV TO ACCCWING ARRANGED
!flVCR, SANDY OF 1RIBUTARY CR3EK, CEDR FROM
SALMON GOHO OF CONTENTS STOMACH OF ANA.LYSLS
U3-11i
..........
1953 16, DECECI3J±L TO 1953 23, SThQER
OF FERIOD EATEN4 ORUkUISMS OF TYPE5 ZJAJOR AUD
FIS1 OF SIZE PERIODS,
Ti TO
ACCORDING
RIVLR, SAUD! OF JTARY
CRMEK, CEDAR FROi
SALMON 00110 OF CONTENTS STONWH OF ILYSIS
US
1553 17, FEBRUARY TO
31,
CELER
1953
OF PERIOD EATEN, &NISMS
OF !PES
MkJOR.
AND
FISH OF SIZE PERIODS, TIME TO
ACCO)ING
ARRANGED
RIVER, SMDY OF TAR! i3J
CBZEE, CEDAR FROM
YOUNG SALMON 00110 OF CONTENTS STOMACH OF LNAJ4Y3IS
116
QTJ3
rJNG
.............
I
.i.yi
rt
XX
XIX
XVIII
j_t, &,UAis
''
r"'
EATEN ORGANISMS OF T!'ES
18, MA!H OF PERIOD
N&JOk AND FISH (iF SIZE PERIODS, 3E TO ACCCRDD
LEE&NGED RIVER, SANDY OF TR1BUTRY
CEDAR
SALMON COHO OF CONTENTS STACH OF ANAi3SIS
om,
XVII
PAGE
4!
Conthrned
tc
APPENDIX
APPENDDC-Cotjud
I4Et o! Tab1e
LIST OF FIGURES
PAGE
FIGURE
I
M&P OF Vi 3TERN OREGON SHOWIMG LOCATION OF PREtS }LEE
;rç 'icw
T&TX
*M# Sa*aSI5a*a5S*aSa4*55a
.l.,.
2
3
1.
I'ERGENTAGE COPOSITION B! NUiaERS OF FOOl) ITEJS OF
YOUNG COHOS AND CHINOOK JWiiON DURIJ:G THE 16-iOflH
&tiPiiNG ?RIOD .iaaaa.....ia.-.a..a........s.
13
SEtSONkL PERCE&GE COMPOSITION B! NUMBEIIS OF FOOD
ITEMS OF JTJVNILE COHO SALMON FROM IAL8ON ORKEE .....
16
SE1ISONPLL PERCENT.GE COMPOSITION BY N(JMi3EkS OF FOOD
IT1ZãS OF JUVENILE COHO SALMON FROM MUNSON CREEK .....
6
CNT?LGE CMPO&ITION BY
SEA.SONPL P
17
iis or FOOD
ITEMS OF JUVL;NILE COHO SALMON FROM CEDtR CREEK ......
7
8
19
SMESXL PERCENTGE COMPOSITION BY NUMBERS OF FOC)
ITEMS OF JUVENILE CHINOOKS FROM MIDDLE FORK
TiILLP.METTE RIVER
8
LATIVE FOOD EIGHT
flRVALS IN
COHO AT 3-HJR SM5PLI
RELLTIONSHIP OF TtGFkWRE A
FROM JUVENII
lARSON C1tEK a.., ..,a a.. a.
9
10
20
-
a
a. a...... a.... ass....
YMRLY M1&NS AND JL:NTHLY WRL1TIONS IN THE RElATIVE
Fool) rIGHT: OF THE 192 BROOD COHO SIJLCN ..........
RElATIONSHIP OF FOOD IN COHO STOMACHS TO
SEfM FL(
AND TELPTJRES II IRSON OREEK ....................
U
RElATIONSHIP OF FOOD IN COHO ST
* T\
iiI'
12
13
?r1t
£i
CilS TO STRE'O
FIi3V
BElA lIONSHIP OF FOOD IN COW) STOMaCHS TO ST11EN FLOW
AND TEMPERATURE IN ABE ETHYCREEK ..................
ho
RElATIONSHIP OF FOOD IN COHO S )MACHS TO STREAM FI
IN CED&R CFtTK ......................
lii
RElATIONSHIP OF FOOD IN CHINOOK STOMACHS TO I&TFR
TFPFATURES IN THE MIDDLE WflT RXVER .........
]
38
.V
1'! r't,rv
't,Jtj.*
AND TTERA.
Ilj
33
Ia
RELATIONSHIP OF FOOl) IN STOMaCHS OF COOS }LkTUBERY
COHOS TO POND TE!t?EIt&T1JRES . .. . . . a...... . ... . . . ......
1i3
LIST OF FIGTrn:S (ccnui)
PAGE
16
iJIT GROT PATt2S OF FISH SP 2LZD
1E 192
Liccr cciic AD cHINcOi SLUON ......................
17
18
19
63
CONDiTION FACTORS OF THE 19S 2 mooD COIjOS AND
C:flc&.Ks BY si caouis
70
iONTHLY CONDITION FACTORS OF THE 19S1 AND 192 BROOD
EN FOR 2MH MONIPA ..,
STBLAM RARED COHOS WITH
73
RE1ATIOSHIP OF FOOD QUANTITIES AND CONDITION FACTORS
AT 3.-HOUR SAETLEX I ?ERVALS L LI(i& CRE1 ... . ...
714
FOODS AND GiWTH OF Juv:.NILE CONG 8AJ23N
OORH!XBUS XISU1H (VIALI3&UM), AM) CHINOOK SADLON
S1(WALBtUi!) IN CERTAiN OREOON STREAMS
TRODUCTION
This is a report oxi a study made of the food and growth of
jnrsnile echo salmon, Oncoithyncluis kisutch (Walbaun), and uveni1e
chinook salmon, Ccornchus tshaytscha (Walbauni), initiated
primari],y to determine the kinds and quantities of foods eaten and
the resultant effects upon fish growth and to identify, if possible
axy factors ]Jiting the production of these species
Oregon streams
in Western
The coho salmon is more commonly reterred to as
The data were obtained from eokly
silver salmon in some areas
fish samples of the l?]. and 1552 brood echo and chinook salmon
during the period of November l92 to April 3.9g.
The juvenile echo salmon gore obtained from two Oregon coastal
streams, Larson and Munson creeks, and from two inland streams,
The
Aberne thy and Cedar creeks
iddle Fork of the Vliflamette River
as used as a source for the chinook salmon samples.
There have been only a few studies made of the food organisms
of juvenile colic and chinooks
but these have been united in detail
and scope 'with little data on the natural food from the surmier rearing
areas, the seasonal and geographical variations, and the resultant
effects of these variations upon growth during the freah-iwter period
prior to ocean migration.
108)
in examining
Shapovalov and Taft (16 pp. 70-73 and lCd-
the life history of the coho salmon in WaddeU
Creek of coastal California, foand that
a1P,Qst nothing is knovni of
the food of juvenile silver salmon at Waddell Creek on the b*sis of
stomach examination".
Chanan and Quietorif (6, pp. l-lI analyzed
the stomach contents of 309 juvenile chinooks taken from the Columbia
River drainage and they concluded that the diet consisted primarily
of aquatic inseet foina.
Chamberlin (5, p. i5) found that small coho salmon in an Alaskan
lake fed mainly on the adult and immature fexs of aquatic insects
and that the larger fish along the lake shore.. fed jredozthiant]zy on
adult insects of aquatic origin,
Other observations of stomach con-
tents were madu by Chamberlifl of young salmon taken in estuarine and
salt water bay areas.
None of these reported studies were designed
to obtain food data through the various seasons of the year in stream
environments.
Notes on Life History
A brief description of that portion of the ooho and chinook life
history concerned with this study may aid in cMainating the need for
a year around sthdy of the food habits,
The coho salmon is found throughout the Pacific Northwest with
the present known range extarxi.ing from Centtal California to Northern
Alaska and Asia.
In Oregon the fish eater the streams Within the
period of October to late January or february 1 with the peak of
epawning generally occurring from late November through December.
The differences in timing of the spawning runs among the streams involved may be a factor of race or geographical location, but the
timing of entrance within an individual stream from year to year is
believed to be generafly deterniced by water temperatures and stream
oho simon. have then observed by the author spawning in Tonnillo
Lake tributaries near Coos Bay in February.
flows.
The yeung fish batch in early spring within a ho to 50 &Ly period
toUawing egg deposition, depending upon prevailing water temperatures.
The newly emerged fry begin to feed even before the yoik
is
completely
absorbed2 and continue to feed almost incessantly throughout the
reaainder of the fresh water residence.
The fish normally remain in
the streams throughout the first sunnier with migration to the ocean
beginning in the £o11cing spring about one year from time of emergence.
It was this period from t ins of emsrgence to migration that the food
habits of the young cohc
were sxaniined.
The sampling period of
November 1952 to April 1951i. ijicluded portions of the l91 brood
hatched in the spring of 1952 and samoles from the entire stream
residence period of the 1952 brood hatched
in
the spring of 1953.
The brood year designation used in this report is based upon the
year during which the bulk of the parent fish enter the streams to
spawn.
The 1952 brood fish 'sem mainly from parent fish entering the
streams during the late fall and winter months of 1952 tit it also
inclades fish resulting from the spawning of the later parent, arrivals
in Jamary and possibly Fabniary.
This brood year designation was used.
beóause of precedence established in previous studies undertaken by
Fish Commission of Oregon personnel.
This brood year designation
differs from that established by Shapovalov and Taft (16 p. 2.3) where
it was determined by the year the fish are hatched..
amp1ea of fish from Larson Creek on iLarch 18 and March 2l contained
ixidiidLtals of the year with food items in their stomachs and the yolk
stiU unabsorbect.
The spr'ng chinook aaluon are found in nearly the saxe general
geographic range as the colic salmon, frc
Alas a and Asia.
Central California to Northern
The adult chinook migrate up the rivers
in
the spring
and sunmer but generally do not spawn until early fall during the latter
part of August and into October.
The :Incubation period of ho to 50 days, as in the colic, is dependent
Cooler water temperatures noxmlir
upon prevailing water temperatures
associated with this species nay exteud this period to over two months.
The life history portion involving the stream residence of the
spring chinook sampled from the Midd e WillaTilette River is more compli-
cated than that of the coho salmon
ward anytime after emergence
in
that the young may migrate sea-
The bulk of the migrants in the Vlillamett
River system generally move to the sea immediately after hatching and
again in the fall.3
The characteristic of the chinook to spawn in
larger streams than do echos, offered more difficulty in obtaining
samples of the resident juveniles for stomach analysis than that encountered in cohos.
It is generally known. that there is some variation in the amounts
and. kinds of foods eaten by a given species of fish depending upon
locality, season of the year, water conditions and relative
abundance of food.
These variations
in
the food supply are considered
important in the resultaüt growth as reflected in condition factor
differences and may even be factors in the fresh water survival as
3Personal coimtunication w.th Prof. R. E. Dimick, Oregon Stae College,
wU as the ages and sises at ihich the fish nigrate.
The amounts and kinds of foods found in the stomabs at any ome
ttme is probably the result of organisms available to the fishes within
the 1iait of the fomging capacities.
The ana].ysis of stomach contents
from frequent sampling of a particular fish poilation throughout an
exbended period is helpful in determining the fl.uctuations in the food
supply and in studying the relationship of the food supply to the
growth and condition of the fish sampled,
Reimers
3, p 328) in his study of iaatero Brook trout in a
California mountain lake, showed that the general decline in abundance
and availability of food was reflected in the average volume of the
stomach contents
in
Allen (2, p. 127) working with Atlantic salmon
)w Zealand, obtained data on the quarty and nature of the sources
of fish food by examining the amounts and kinds of food eaten.
This
he accomplished by examining the stomach contents of trout of all agez
under a variety of conditions.
T]IODS OF DATA COLUCTION
The basis for obtaining the data for this study revolved around
a regular weekly collection of juvenile fish from each of the five
streams and samples at two-week intervals from a coho salmon hatchery.
The sampling ;eriod started in November 19S2 and continued to April
For the most part, a weekly sample of ten fish resulting from
each brood year present was collected from each of the streams.
Occasionally the nuuber collected was slibtly less and the vieeldy
collecting intervals varied a few days,
Random samples were taken to
ri
assure a better representation of the available polation. Several
pools were usuaUy seined
in
obtaining the fish sample.
two or three fish were usually retained fra each pool.
done, in part, to lessen the efiect of decreac
No more than
This wa
g the noola 'opulation.
Physical records obtained at the time of collections include the
tL'e of sampling, air and water temperatures, turbidity, estimated
flow in cubic feet per second, and uather conditions.
rating used,
The turbidity
established earlier by supsrisory personnel of' the
Fish Ccsmdssion was:
No. 1-water clear on riffles and in pools
No. 2clear on riffles, murky in pools
No. 3murky on riffles and
iii pools and, No. b-- Saupy with mud.
A samle of aim fish was obtained each week £ro
ery frt March 18 to April iS, 1q53.
the Cooa hatch-
For the remainder of the sampling
period to Ireh 195b, 12 fish were collected at two-week intervals.
These samples of hatchery-reared silvers were employed in making coin-
parisons of food weights, growth, and condition factors with the viict
etreazn fIsh.
Tabulation of' the pbsical data taken is shown In
Appendix Tables XXVI to XXXI.
SALTLfl
AREAS
8e$etion of streams for obtaining the fish samples was made
partly on the basis of geographic separation and. the pc mity to
laboratories of the Fish Commission of Oregon frcn hich the strears
were readily accessible.
This geographic separation of streams was
desirable in obtaining samples wiich might show differences in foods
which occur due to geographical separation.
7
Figire 1 is an outline nap of Western Oregon giving the locations
of the sampling areas
The beakauarters station for this study is
located at Charleston on Coos Bay in south-western Oregon.
From this
station sanoles of cohos were coilec ted from Larson Creek, a stream
flowing into a tidewater arn of Coos Bay.
Saiiles of hatchery reared
echos were obtained from the Coos River Fisheries Station, located
Iii. miles from the bay at the head of tidewater on the South Fork of
Coos River,
On the nort} Oregon coast, sam:les were obtained from unson
Creek, a tributary of Tijlanook River which flows into Tillamook Bay.
Personnel from he Bay City laboratory conducted the sampling
in
this
stream.
Two sampling streams were selected in the iillanette River
system.
Abernethy creek, a tributary of the lower TiUamette River
near Oregon City was sampled by personnel from the Clackanas labo-.
ratory,
Spring chinook were obtained from the upper Wilamette water-
shed ij the Middle Fork by personnel from the Willamette River laboaratory.
Cedar Creek, a tributary of Sandy River, which flows into
the Columbia River was sampled for cohos by personnel from the Sandy
Hatchery laboratory.
Table I lists the species arid numbers of fish collected from
each area and the total number of fish examined.
of l3
There was a total
0 age group cohos sampled and 3521 fish of the age I group,
making a total of 287
echos sampled from all areas.
The total
number of chinooks sam led was 179.
A
E1
Co
Ba
FIGURB 1. lAP OP WITBIUI ORBGON SHOVING WCA!MON OF £WA WHIRl
FISH 8A)IPLIS IRI O)TLINED
1&BLE I
irnbers
of Fish by Ag. Group Collected free
the Samplød Areas
Total
Or
0
1
Abernetby Creek
Cedar Creek
259
276
LarsonC
126
Munson Creek
Coos }iatcIry
14.20
Coboa
187
296
636
126
535
230
722
1056
332
14.9
130
179
1IL03
1651
305I
1i3
2Q
Chinooks
Middle Willamette lUvez'
Totals
TAB.1t1ORY PiWCEI7JRE A
).UflE
All fish emined had been preserved for various lengths of
time in a solution of i(
fornelin.
as
Th. length of each fish
recorded to the nearest millimeter by measuring from the ti
of the
snout to the Lark of the caudal fin.
The use of the analytic balance and the rapid rate of evaporation of moisture from the body of the fish made it necessary to
develop a standardized procedure for weighing all moist items.
This
wee done by selecting fish of various sizes from 50 to 86 millimeters
in length and following a preliminary removal of all excess moisture,
the fish were weighed individually with the weights recorded at onehal! minute intervals ±'or a period of 10 minutes.
recorded to the nearest 0.001 grem.
The weights wore
It was found that the rate of
evaporation and the percentage change in weight for all sizes of
fish had decreased sufficiently at the end of a Live-minute period
to establish this as the interval for reading and recording the
weights wit
ththnum of error resulting from fish size nd air $X
p001115.
The stomach of each fish was removed by cutting at the gullet
After identification the entire stomach contents end filter were
k1
FOODS
Diet Copsition
A total o
19 different groups ot' food ite3ns vere identified
in the diets of the juvenile salmon as shown in Table II.
SITLN BY NU}3KR OF FOOD ITIMS OF
PIRCENThGE Co
!OUiD COHO A}D CHINOOK 5AUON DURING A 16-MOWII
TJ3LE II
LMPLThG PRI0D
COHO
iRSON
Diptera
Collembola
Plecoptera
60.5
10.8
5.0
Eiemeroptera
7.5
Coleoptera
H,menoptera
Hcmoptera
Arachnida
IS
1dracarina
5.3
0.7
2.0
1.3
2.0
1.0
0.14
1acostraca
Annelida
'ichoptera
CHINOOK
JNSON ABERNEThY CEDAR
52.b
69.0
hI.6
15.7
6.9
12.5
2.6
3.9
2.7
11.2
13.5
10.14
14.3
14.5
13
33
0.7
1.5
1.1
0.5
0.5
6.2
3.9
IS
3.1
6.6
0.2
1.7
Hemiptera
Cob eggs
0.].
0.14
oJ.
0.14
0.5
Diplopoda
Chilopoda
Thysanoptera
0.1
0.1
0,1
0.1
0.2
8.1
0.1
L!oilusca
Lepidoptez'a
0.6
0.3
0.7
0.6
0.7
M-W41T
39.0
3.7
39,9
1.2
2,1
1.8
0,6
5.0
0.14
33
0.2
3.2
6.14
0.1
0.1
0.1
tributed the largest percentage In numbers o.
items found in the
stonachs of eohos from the streams, ranging fron 141.6 per cent
Abernathy Greek to 69.0 per cent
inportancc
in
Cedar Creek.
ere Collembola and E*iemeroptora.
in
Other groups of
These three contri-
buted from 65.5 to 86.3 per cent of the total items in the stomachs
of cohos from the four streams
Other groups represented but of
of mature and lmaatur'e forms of aquatic origin with some adult forms
of terrestrial origin.
The Diptera group was comprised nain]r of
larval, and pupal forms of aquatic origin along with some adult forms
of both aquatic and terrestrial origin.
The Ephomeroptera group was
comprised a]iiost entire3r ci' the nmpha1 forms.
Terrestrial Hansen-
optera, Lepidoptera, Annelida, and Coleoptera combined, contributed
a m
ixun of 3.
per cent to the chinook diets and a maximum of 8.1
per' cent to the diets of colios in Abernathy Creek.
Thiring periods of fresbet conditions forms such as spiders,
earthworms, and Collembola appeared in greater numbers than at other
tines.
The 16 month diet pattern for chinooks indicated that Ephemeroptera
contr'ibuted the largest number of food items in the diet, constituting
39.9 per cent of the total contents by number.
The aquatic Diptera
were nearly as numarowi forming 39.0 per cent of the total number of
items
Other groups of lesser importance were Trichoptera and Hydra-
carina, which contributed 6.14 and 5.0 per cent, respectively, to the
diets.
13
(chi 1op.
bip1opot&
LAIlSOl
jSi1'ur ggs
JIsaipisra
(Tricbopt.rs
Aims1Us
L
Dipt.rs
(jiiliioostrscsJ
-i34r&csria&
--
Jjiomopt.rs
-"R7noptsr
Col.opt.rs
phsmsroptsrs
Plscoptsrs
Coilsubols
(Lspido Pt. vs
\ Thyssnopt.rs
j Chilopod*
Silvsr sgga
Hsatptsrs
-<\\\?riahoPt.rs
Diptus
Lrschids
"Horopisrs
j
ii7noptsrs
col.opt.rs //
Iph.ropt.rs-
I
-Plscopt.rs
colisabols
MIDDLI WILLAT?1
/
PisooptIrs-
Dipt.rs
I
E
Anaslits
-Arsohai4s
I
-
\Iphsasrspt.rsi N.
2 1Vr?Aca
-?riohsptsr.
---
-----liosoptors
cooeiioi IT 1ITY*1! 0? OD I?1 0? yoIs
PIGV
ODUD LID miixooz i*zi JI1i TID 1-Zwr! IL1IQ P1110)
A notable difference between the compositions of diets for the
two spec iss of salmon was the abuncnce of Collsmbo],.a in the stomachs
of cohos and the complete absence of this form from the chinook stomachs.
It is not known if this absence was dne to availability or was a rejection of this item by the ehinooka. 0haman and QUistOrif (6, pp. 3-7)
in their food studies of juvenile chinook salmon of the Columbia River
drainage, found a diet composition very sinilar to that of chixiooks
from the Middle Wilisnette in that the Ephemeroptera and Diptera ocprised approxioate1y 80 per cent of the diet.
Their findings also
showed no Collembols. in the diet.
The foods of young echos and chinook salmon were found to consist
primarily of aquatic organisms from the strean bottom with the fre-
quency of appearance of terrestrial forms such as Coleoptera, }menoptera, .&nnelida, and Collembola apparently more influenced by vrn!i*tiue
in the seasons than ware the bottom 'dwelling organisms.
Some of the food organisms taken at the surface were the adult
stages of aquatic insects while others were of terrestrial origin
probably entering the stream as a result of accident or freshet con-'
ditione.
Ssasonal variations in diet.
The samplieg period of 16 months
was divided into five appz thaately equal divisions.
These divisions
were to correspond as nearly as possible to the variations in seasons
and the emergence of the new year class of ooho.
The first and fifth
divisions generally inc]mded the sampling monthe of November through
roh for the winter periods of 192-3 and l%3-Sb.
visions included samples taken in the spring,
The other di-
srch to midJune; in
15
16
(2)
r. li-June 10, 1953
(1)
111u..ca
/',Cottid egg.
Nov. 26, '52-Jr. 7, '55
çn. .b reii*ins
jSilv.r egg.
Trichoptera.
-Anna1id*
31&Coetrsic
(Hydrlc&rin& (/''
Diptera
Arschnida
Dipt.r&
\
( /
)//
Hym.nopter,,/
Co1eopt.r
-Ipheineroptera
'-Plecopters
Co11ezro1s-
(5)
June 17-Sept
(4)
Ito11u.ca
16, 1953
Sept. 23 Dec
jCottid eggs
16, 1953
Diplopoda
Chilopoda
Silver eggsj
Trichopters
Annelid -
\\\7:;t/
---
\\"ph.meropt.rs
/-.
\P1.copt.rs Colle.bols(5)
11usca
Dec. 23, '53-Ir. 17, l95
Diplopod*
Chilopoda
Silver eggs
Trichopters
Annelids
Dipters
)lsoo*tit'
Hydrscarins
j4
Hopter$
I
(
Hynoptera
-,
\\
\
Colleo1a
_Pl.copters
_Iph.ropter.
Co leopters
FIGU
3
SI&SONAL P!RC!NTAC
O$IIO1f 3! NVBUS OF OOD I?I
OP JUTNILE OHO SALICK PDX LAOI w&
Li
Silver seal..
(2)
x. 17-Tans 10, 1955
(1)
Silver ggs
7 *.r. 11, 1965
Chilopods
Diplopoda
Hemipters )
riehopt.rs
Ann.lida
1sc. strsc$
1
ipt
(Rydracarinai J
) Arachnids
)HoRoptsrs
lioptera
Plecopt.ra
Co liembo la
(5)
(4)
June l7-S.pt. 16, 1955
lluscs i
OIousts
I
zz/D-&
-
Sept. 25-D.c. 16, 1965
(trichopt.rs Dipter.
Ann. lids
1aco
etracs1-<Diptsrs
pt.rs
l.opt.rs
Col1scla(5)
Dee. 25, '53-Apr. 7, 1954
Silver scale.
Aquatic wor
Chi lopoda
Zriohopters
Diptera
nne lids
1sco straca
Ce11.ela
Hynoptera
9e leopters
P1
ii S1*SOIAL PI3I7AG2
1POLTLOI 3! IU1M 07 POOD I?I
OP uvu iLl
EO SALJ P* Jl$OJ '
18
(2)
(1)
r. 1$-Jzne 10,
-Tnyi&noptr$
Nov. 19, '52-ar. 11, 1953
Silver eggs
Ston. 5
-0 at racod.a
çTrichopt.raLAzinelida
MLlaco it rica
Dipt.ra
Diptera
Hydracarina,
Hopte ra
1leno ii
Hynenoptera
Coleopteç'
pheurop'te
PlecopteraCollembola
(4)
(3)
Jane 16-Sept. 16, 1
Sept. 23-D.c. 9, 1955
- Hynopter&
-Col.opt.rs
Epheroptera
Plecoptera
-Co11.bola
/Oottid eggs
Chilopoda
r&k'1i ptera
Anne lida
Lepidopt.rs
Hemiptere
Prichopters
Hydricerin*
Arachnida
(5)
February 15, 17, 24, 1954
collembola
P1.copt.rs
(
I
hi lopoda
ph.roptera
Isopoda
laco straca
Ann. lida
Col.opt.rs
ffynopt.r$
Homoptera
______.Arachnida
S SIA2OftL PIRN?AGI OOPOSI?I0N )T NU1BI
OP uwILI NO SALIOF PaDI A.gwaIT
0, FOOD Ifl
3.9
(2)
(1)
r. 1$-J1z. 10, 1955
Dsc. 10, '52-*r. 10, 1955
Hydsc$rins
bm.bnid*
Dipt.ra
KoptSrs
R7nopt.rs
Plscoptsr&
c.11.abols
(5)
(4)
3m. 1ø-S.pt. 16, 1955
S.pt
25-Dsc. 16, 1965
£nn.lid*
1I4o itrscs
'Arschnid.s
Dipt.r
Dipt.rs
Ropt.ra'
Hynopt.rs
Vol.opt.r&
P1.copt.r&
c. ilsabo 1
(5)
D.C. 31, '53-Psb. 17, 1954
Co Usabo 1*
P1.00pters
Ipbsropt
PIG
6 SAS0NAL PR*W!A1 CO0SI10N
OP JUYNILB
BY 3UIIIBBRS OP
H0 SALN PI cBDAB c
OD I?1
20
(1)
(2)
r. 1O-J-
Nov. 26, '52-Msr. 4, 1953
11, 1963
T r I cho pte ra
Anne 11 &
Hydr$carin&
Ar..chnida
IL
Hopter&
Dlpt.r&
Hynopt.ra
(
opters
Coleopter&
Diptere
pheniropt.rs
-Plecoptera
(4)
(3)
Nov. 5-Nov. 18, 1955
Tune 25-S.pt. 17, 1953
-H.miptsrs
'l'richopter&
---Hydrscertn*
-Lrschnid*
Ho.opt.r&
Rysnopt.rft
-Co1.opter
Ipheropt.i
Plecoptera
(5)
Jan.. 19-Psb. 19, 1954
Dipt.ra
I
---Jijnopt.rs
Iith.ropt.zs
viau
7
susoi*i P!fiCI?AG1
OP uvIL CUI*)O
,ioei,ioi Y JU
o POOD 1fl
PlOW EDDLI lO
WILLAI'fl hUh
22
hours, the dried food weight averaged about 0.23 per cent of the wet
fieh weight.
aapliag period when the teperature was
At the .1500
80°, the dried food weight dropped to 0.15 per cent of the body weight.
A slight increase to 0,19 per cent in relative food weight 'was noted
at I00
at a tenpe.ratore of 77'.
Although the least number of items
was. contained in the stomachs during this period (Table IV') they
were of the larger adult forts and produced a higher dried food weight.
An accelerated feeding rate was observed between the ho rs of 6 p.m.
and 9 p.m. when the relative food weight increased to 0.W4 per cent
and the temperature d i'opped 100 to 67°.
TABlE III SAIEPLThG D&TA FRO COHOS C0LlECD AT 3-HOUR flRVAL9
F30M IARSCN CREK DUItIZ A 214-hOUR PiIOD
(oan
Tine of $ample
0900
1200
1500
1800
8-.12-53
aoo
21400
0300
0600
8..13-53
of
Lish
La
10
10
10
10
10
10
10
10
Me*n
Weight
Uean
Dry food
Grams
ight
L!M.
Grems
58.6
2,856
3.338
o,0068
0.0075
34140
0.00147.
3.8146
3.927
3.708
0.0073
0.0171
0.00RB
14.120
0,01214
3.517
0,0130
62.14
62.0
67.5
66.2
67.0
68.9
66.3
According to the total number of items in the stiache at the
various sampling tines, the fish apparently ceased feeding at an
upper temperature of 76°
The data. are insufficient to ehow the
ezact temperature at which feeding was resumed, but it does indicate,
however, thatitwas'withintherengeof67°t011°.
The reduction
relative dried food
weights and numbers of food
items at the 21400 hour sampling period may have been due to hunger
EN AT 3aHOUR UflVAL3 DURflO A 21p.HCXJR
TABLE IV WATER TE1iPERATURES AND $TuMAGH ANLi3I$ OF FIllI
aARPLD3 PERIOD IN lARSON CREEK
$
I
ii
4
4
No. Water $
-
r-1
Q0
oi'
Sample Fish GF
$
NUMBER 0? ORGANIM
0900
10
65
90
95
27
17
152
15
1200
10
75
161
32
10
230
514
14
1500
10
80
23
1
5
19
33
1800
10
77
29
3
U
21.00
10
67 198
3146
3
21400
10
62
236
140
0300
10
59
:1.814
o600
10
58 151
3
5
1163 11
3
3
114
14
1
3
522
6
1
1.1
90
1
1
61
2
2
3
14.
1
1
3
223
6
1
6
9
7
3
1
21.9
13
1
17
5
1
1
2
14
2
1146
9
8
So
9
5
1
1
76
5
82
1.
19
14
1
7
2
61429
2
806
1
537
1i59
7
369
being satisfied following the preceding fasting period and a resumption
of a more no,mul feeding pattern.
Hoar (bc. cit.), having found art extended fasting effect as a
result of high temperatures, noted that the fish exposed to high
temperatures for more than 3
hours did not feed again for a period
extending into the beat of the following day even though the inter-i
vening temperatures had been reduced below that which had induced the
cessation of feeding.
The effect of daily temperatures exceeding 76° could have a
disrupting influence upon the nornal behavior and feeding pattern
of juvenile coho salmon.
ily temperatures exceeding 76° during
the sunmter months are not uncosunon in somo portions of coastal streams
flowing into unshaded areas of a cut-over watershed.
These high temper-
atures may have an accumulative effect, as described by Hoar, upon the
resident fish populations and could be a factor limiting the production
of cohoa in these coastal streams.
Donaldson and Foster (7, p. 36) in. experimental iiork on juvenile
sockeye salmon in Alaska, found that these fish were not able to
tolerate a 78° temperature for more than a few daye.
At 73° there
wea a baa of weight and considerable mortality; the fish, however,
could maintain themselves at 70°.
to
Reducing the temperature to a 62°
range improved the rate of growth and utilization of food.
Shapovabov and Taft (l, p. 70) indicate that high temperatures and.
lack of suitable foods were caused for loss in numbers of salmon fry
in California prior to migration.
There was no indication of a decreased feeding rate during the
hours of dininished light intensity in Larson Creek, such as was
observed in Atlantic salmon by Hoar.
The foeding rate between 6 and
9 p.m.. as sJaon in Figure 8, exeeeded that of any other period.
The
period of 2.00 to 0600 also showed greater feeding activity than.
during arr of the daylight hours.
and
treaza Flows
The fluctuations in numbers of the different orgarn.sms appearing
in the stomachs at the various seasons appear to be coincident with
certain pIsical changes in the environment.
During the ouirner months
stream flows are at a min.mun and temperatures at a maxi'mmi.
At this
tine certain groups appeared in more of the stomachs and constituted
a larger component of the diet than at other periods. Mce groups
of organisms wsro also raeaented in the diets during the low flows
of the suer months than during the higher flows of other seasons of
the year.
Eeiieroptera adults appeared a]most solely during the months of
a
0'
00
0
\V
in the stomachs o
period.
f±sh sampled £rcm all etrears during the low flow
This group contributed a maximum of IC) per cent
in
the diets
of echos from Larson Creek but was somewhat more lmortant to the
summez diet of chinooks contributing 18.lI per cent.
Earthworms were aLiost entirely absent from the diets during the
mlxdzmim flow period for their prezence
in
the stream generally occurred
Collem-
during periods of rainfall and washing in from the stream banks.
bola appeared during periods oi' increased rainfall and higher stream
fl(mw during the fall and spring months.
The Plecoptera nymphs entered into the diets of both echos and
CIIinOO
at all seasons but to a larger nwrber during the fall and
winter when the
ter volumes vro greater.
flpheneroptera nymphs were found in the stomachs throughout the
entire year with the adults generallv appearing in greatest numbers
during the low flow period of the susater months
Larson Creak fish
did not follow this pattern, but rather showed a decline in the numbers
of both nymphal and, adult forms during the reduced flow period of Ju
to October.
There was a notabla increase in the numbers of Diptera
pa, flomoptera and Hydracar ins appearing
in
the stomachs of Larson
Creek fish when the average flow was 2 cubic feet per second as compared to the average winter flow of 28 cubic feet per second,
Pods and sj groups of Lish
The effect of different size groups of fish
daring the spring period of March to
tne.
in
selecting different
Fish of these two brood
years were available from Lerson, Munson and Abernetby Creeks.
The dominant foods
in
the diets were determined by the numbers of
organisms each food group contribited to the diet composition for the
I6month sampling period.
The8e dominant foods are shown
numbered according to the relative
oontrUmted. to the diets.
in
Table V
ercentage by nuüers each group
The preference rating for these dominant
food k'pes by each brood year was deterained by the frequency of appearance of the items
in
the diets as shown in Table VI.
The l92 brood year fish from the three streams ranging in sizes
from 31 to 68 niilUmeters, indicated a preference for the smaller soft
bodied forms of Diptera larvae and Collembola.
The larger, years-old
fish of the 191 brood, ranging in length from 62 to 1Z miUlmeters,
showed a prefersncL for the larger more chitinized ferns of Ephemeroptera, Plecoptera and adnit Coleoptex'a.
The large earthworms were
eaten to a greater extent by the larger fish.
Within the units of the available food in the fauna, the per-
organisms of different
ize8 is perhaps Jixd.ted to sce extent by the
ability of the fish to thest that particular food item.
&BLE V ThE RkTING OF FOOD GIiOtJ?S fl RElATION TO PERCENTAGES
BY NUMBERS IN ThIE STOM.0li CQN!INTS
cd
00
Ha
Cli
Z
-o
El)
l)
4)
Eli
-i
El)
a)
+'
4)
r-1
0
0
o
H
a)
E
El)
fl
0
tD4
M
2
0
Q.
$
ti
0
r4
Cl)
ED
rd
li
(1)
C
H
1
5-
a)
-P
0
0
(-t
12314
1235
12314
132
1
Q
0
C
(I)
4)
-P
0
)
H0
0
5
2
14
14
5
14
li-3
S
BLE VI COPARISOU OF FOOl) PRERENCE BY TWO AGE ClASSES OF 00110
&WON FOR TEE PERIOD OF MAROH TO 31JtE 1953.
NULBERS ARE PERCENTAQES OF TOkL ITEMS !ATEN
8tream arid
No.
Brood Year
Lareon
1952
1951
lineon
1952
1951
Abernethy
1952
1951
Fist
12?
50
US
Size
Range
31-66
1!
Parcentapf
62.2
16.6
5.3
7.9
11.8
56.5
25.8
7.2
2.5
3.8
80
62-115
142.6
80
32-55 55.14
75-121 W4.8
7.5 18.14
6.5 214.1
147
7.8
150
7.].
9.7 23.?
ot !toC
2.14
71i25 28.9
314-55
1
1.6
8.7
3.6
14.0
1.3
2.2
.30
The uwnerical analyses of stomach contents by identifying the
items present may be useful as indicators of the Launal composition
which may occur in the streams sxid also for showing the preferences
This method also
for certain organisms by various sizes of fish.
shows sowe differences in foods produced in the different geographica]. locations and the varistions brought about by seasonal influ-
ences as shown in Figures 3 to 7.
It is difficult, however, to show precisely the relatio* hip
between the growth of the fish and the numbers of items eaten due to
lbs
the variance in kinds and sines of the individual food items
relationship between foods and fish growth is better shown by using
converting to a
the dried weight of th gross stomach contents
percentage of the total fish weight and making comparisons with
This conversion to a relative food
changes in weights and lengths,
quantity placed the weight of dried stomach contents of a.0 fish on
a common reference point for making comparisons between sampling
periods and streams without regard to fish size.
The variations in percentages ci' relative food weights by sampling
periods and streams for the 1951 and 1952 brood echos and chinooks
fz'
afl. streams are shown
TABLE VII DPD FOn
in
Tables VII and VIII.
p SC! CoNTTNT FROV COjIOS AND
CLi1!COxS oF Tirr 1951
OOD SHOWi' A
A IC1NTkG
PRESERVED F!S VEIGHTS
Relative Food Weights
Streai
1ov.
-'.#
Cecar
0.11
Larson"
!inson*
Mid-Viillamett___
Meazls*
Dec.
'.'.
0.
0.o
0.13
Jan Feb.
Larcb April ?ay
"at.'.
0.3204
0..
0.j
0.u7 0,j
0.
0.
0.26 0.214
0.17
0,26
0,08
0. 0
o.0.i8
0.31 0.27
0.
0.22
O.W)
0.
0, 9
0.1.5
0.3
0.17
0.30
OF 'E 192 BEOOD COHO
BLE VUI DRIED FOOD TTIGHTS F1OM STOW OH CONTEN
AD CUINOO SfLUN SJOWN AS A P1CLY1flL OF THE FISII E10IT
Mar. A
Stream
,
May June
,
Laron*
0.89
.dd1e Willaniette
Coos Hatchery
.
Ju
.
Au ,
Sept.
Oøt,
o.o
,
v,
Dec.
,
b2
Jan,
Feb.
Mean
0.20
0.27
O.16
O.lL3
0.28
0.13
0.11
0.29
0.20
0.98
1.17 0.0
0.27
0.15
O.2t
0.17
0,27
0.37
0.68
0.30
o.L7
0.lj.3
oJ
0.30
0.10
0.26
0.26
O.Z
0.27
O.Ih 0.15
0.18
0.28
0.26 0.29
0.20
0.20
0.12
0.10
0.32
0.30
0.22
1.32 1.20 1,62 1.68
0,8
0.33
0.89
0,79
1.02
O.bS
O.8I
i.i1
0.57 0.62 0.37
0.23
0.21
0.18
0.26
0.28
O.Ii.2
0.23
mean
o
colic $treame*
0.33
33
i
I
là'
i
K
Hit
1'
O$IH.aC**RT
4..-i
I
til
3.0
V
E41E4
_i
.- 0.1
Oil
0
- 0.
.ol
9 V.
'S
iØ.l
H
0.3
O$tH
I
E11
thiction in relative food quantity from 1.68 per cent in July to a low
of 0.79 per cent in August.
The yearly mean relative food weight
for the coho streams varied from a maximwn of O.Z7 per cent in Larson
Creek to 0. 21. per cent for Abernethy Creek.
These percentages were
Constdereb3ir less then the l.li per cent comted for the Cqos hatchery
fish.
Relative food uantitiés fror the Willamette River chinooks showed
a generaUy lower trend than the coho streams, varying fran a spring
maximum of 0.29 per cent in June to a minimum of 0.10 per cent in
November.
Fish of comparable age from the 1951 and 1952 brood cobos consumed approximately the same amount of foods during the January to
April sampling period.
This is shown in Table 1X with the combined
data from Larson and Munson creeks.
TABLE
RElATIVE AMOUNTS OF FOOl) FRC
TVO BROOD
RS DURI1)
COMPAR1BLE SAETLIm ?iODS, SAPLES TAKEN OKE
APART
larson and Munson Creek
Data Combined--- 1951 Brood (age 1)
1952 Brood (age 1)
!EAIt
Relative Food Quantities in Per Cent
Feb.
Mió1i
pril
Jn.
0.21
OJo
0.29
0.37
0.2l,
0.18
0.33
0.1.i.2
For the entire sampling period o.1 the 1952 brood echos, there
was very little ditference noted in the average amount of food coz
sumed in relation to fish weights from Abernethj, Munson and Cedar
Creeks, lb1e VIII).
Larson Creek, on the other hand, produced an
aver.aU average relative food weight nearly double that of the
other atre
Coos hatchery fish, living in a near ideal food
high teseratures.
was ecamined for the 2l-hour sampling period on Larson Creek. Tm
daily pattern of high temperatures ama food as shown in Figure 8 was
found to have sie parallels with the monthly pattern of feeding of
the l92 brood salmon as shown in Table VIII.
The iood quantities in the stomachs
fish.
in
relation to fIah waight
The highest monthly avoz'ae tempern,ure for larson Crook was
62j° F.
hopeas the highest recorded daily temperature was 80°.
During the late fall ad winter months some irregular patterns
37
similar temperature trends
This is indicated in Figures 10 through
iS.
The greatest quantity of food. in relation to fish weight for the
Cooe hatchery occurred. in the months of Juno and July.
The average
fish lengths for these two months were 67 and 80 millimeters, re-
spectively. At the oeak food consumption period these fish were
approximately twice the size of the stream fish samples when they
zhibited their greatest food intake,
hi].e the plotted temperatures
in
Figures 10 to 15 do not appear
to be near any critical point, it should be remembered that the times
of the individual samllng were not at the peak daily tempmeatere
periods nor were they necessarily on the warmest days of an week.
Sampling for the 'ost part, was done in the morning bat ore peak daily
temperatures were reached around 3 to t p.m.
The effects of food availability, dinrnal feeding pattern, texnp-
eratnres, flows, and sizes of fish may ail have influences on the
amounts of food
in
the stomachs.
The one factor exerting the greatest
influence on foods in the stomachs may be that of high temperatures
as indicated by the food and temperature relatiniship in Figures 8
and 10' through 15,
ORG VTTII IN IJiNO
38
so
4o
3O
r:;
1.0
.7
0.5
0
0.1
0.0
0
0
(I,
0
10
z
'-4
0
ID
P I A *J J i3o ID
IOI? HS
10 RLAPIONSHIP OP JOOD IN
S?RAM PLOW AND P PRATUR!S
FIGUR
II
HO SPOM&OHS 'ro
IN WON CRK
39
0.4
1951
3OD
0.5
z
8
U)
1952 1OD
/
BC
70
60
50
40
50
'C
C
Y
FIGU
F *A MJ .t A 501 D J P *A
KI?I3
II
RELATIONSHIP OF ROOD iN CellO SPOMACHS TO
STREAM FLOW A1D rMPSRATURE IN )UNSON vx
hO
70
460
5O
I
c
0.4
1.1
eo
90
JDJTIAIJJASOND
IOITHS
FIGUR!12 RLLTIONSHIP 0? FOOD IN (X)HO S!'OM*ICHS 'P0
SPRAIt FLOW AND PERAPU
IN A3RNE'PHT CREEL
t'T
Oil
0
0
01
0J
0*
0Q
3.,,
tQ6t
aoc
Z96t
aocu
ii
0
t0
0'.
00
0L
0,
00
03!
OI
Oaf
Ott
'-4
4
0l
BY
110
UIOL
Et II}INOLLTtli iO clOOd I 0H03 SH3YYOS
0 1LVLLS *O'Ld aNV L
NI
gYa
X3
0
Li
p.
c ju i
FIGUBZ ]j
1.3
1..! J% JULT hUG Sd'? oC
iOT
IZC J1
1*B
0 N P H S
LATIONSHIP OP FOOD IN CHINOOK STOMAQiS TO %!ATER TEP3BATU.S
IN THE MIDDLE WI LLAETTE RIVER
0
'
0*
os,t
09't
eg't
OElp
(n
o.t
'tI
ot.t
OO'T
08'4
i4v
i* **w
rznr
i
3o
£01
3*
s1.1I1toI
tRflOL
aIHSIOIYt.i iO
AZ}{3LVH SOHO3 OJ NOd
aoo NI SN1YIOJS o
sRaI.Y*$J
S003
sampling of the 1951 brood cohos began on November 19, 192 in
Abernethy Creek, with larson Creek sampling following soon after on
November 26,
The first Cedar Creek fish were taken on December 10,
wblle those from Munson Creek were seined on January 7, 1953..
Samples
from the Coos hatchery were first obtained on March 6, 1953, which
was lmmediately prior to the release of the new 1952 brood year into
the hatchery ponde.
Chinooks from the Mjddl8 Fork of the T(illamatte
River wero first sampled on November 26, 1952.
Table X shows the
mean lengths and weights and mean sampling dates of the 1951 brood
year echos and chinook
The last dates of sampling on this brood
year were determined by the migration of these fish out of the saap1.tg areas.
The average weekly lengths of samples from some of the streams
indicated a gain in length of the fih for some periods and an apparerx
reduction
in
length for others
This apparent decrease in average
lengths is probably a function of sample size in relation to the r1de
range of fish sizes available and probab:Ly reflects the inadequacies
of the sample size during these periods.
lien (1, p. 110) in grouping samples of brwi trout on a monthly
basis, also encountered these negative growth periods.
He 3i:plies
that the size of sample might be a factor, for he states that
older year classes
in
the
where the samples are smaller and the growth rate
is slower, wider grouping is desirable; that is, including samples
from a wider range of tise.
Shapovalov and Taft (16 p
71) in combining the mean lengths of
cihos by two-.week periods, showed that there
ors ce*tain sampling
tAILI 3.
A11 L!0T1!S IJD !IGR?S, AND
L&0N
Mean Mean
Date
12/3
12/10
12/17
12/214
12/31
1/21
1/28
2/14
2/11
2/18
2/25
3/5
3/U
3/18
3/21
14/1
1*18
14/15
1/21
14129
5/13
5/20
No. L.
Fish Me.
fft.
Urn.
10
10
5
10
9
9
69.9
58.6
61.2
14.35
614.14
3.1414
70.14
14.145
82.2
7.06
11
10
7
70.5
73.3
14.149
2.77
3.12
.514
82.0 7.59
5 80.0 6.91
3 80.0 6.32
9 91.8 10.614
1 92.0 9.28
10 109.3 15.70
U 100.14 12.02
10 102.1 12.92
3 87.0 10.91
9 98.9 13.514
10 110.8 15.59
10 112.2 16.17
5 103.2 114.33
3 88.3 8.77
ABERNXE?
Mean Mean
No. L.
Nt,
Fish Mm.
Urn.
10
12
9
10
13
11
10
10
10
10
10
10
10
10
10
10
10
11
10
10
10
6
10
71.1
73.1
75.8
76.2
77.0
75.5
72.2
J
7
Fish Me.
l?.&
!1U
Gm.
Mo,
L.
ITt.
Fish Mm.
Urn.
COOS HATCHERY
Mean Mean
Wt.
No. L.
Fish Mm.
Gm.
A11M)'
MID-i1ILA3rTE
Mean Mean
No. L.
Fish Me.
iTt.
Urn.
10 101.0 3.1.38
10
6.19
6.17
101 81.14 6.03
101 92.6 10.56
9:1.
5.26
14.22
14.06
5.25
75.3
5.25
5.17
7.00
814.9
£I0
14.714
14.68
814.5
814.9
tt
Mean Mean
IEOO
4.20
77.0
85.1
83.0
85.7
82.7
87.3
Mean Mean
HO AND
14.57
14.93
.714.2
714.9
A.N SARPLING DATES OF THE 1951 BBOOD TEAR
6.1*6
7.140
6.914
8.30
6.86
7.52
7.70
88.3 9.314
89.6 8.52
98.3 11.13
95.14 10.63
10 1014.6 13.06
10 103.0 12.26
1 101.0
-
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
79.0
6.149
814.5
7.66
7.16
81.7
75.3
80.0
80.3
86.0
82.6
79.8
814.6
5.147
7.214
6.58
8.02
7.23
6.145
7.614
82.3 7.07
76.5 5.37
85.8 7.53
82.0 6.514
87.1 6.15
1.0
87.0 5.96
10 92.5 8.83
10 100.2 11.75
10 98.14 11.07
10 95.1 10.55
5 103.0 11.80
9.78
80.14
U 97.2
79,14
81 814.5 7.114
7 71.9 14.58
61 86.8 7.59
7 72.9 14.147
6 67.2 3.75
61 93.5 10.114
6 67.3 3.59
14.. 71.3
14.19
90.5
51 80.5
141 86.0
9.00
7.50
7.27
75.5
14.82
l4
14
7.65
6.19
6.87
3.60
5
86.14
14
3
81.3
83.3
66.7
14
m.e 5.25
14
86.7
52 75.8
3
7.146
5.38
7.86
10
91.5
91.0
8.149
10
92.1
9.23
114
9
10
96.9 1.0.73
92.6
9.li14
6 139.5 314.23
10 86.2
6 136.3 28.90
10
10
6
914.0
14
93.3
7.38
8.93
6.66
6.53
8.06
6 1314.7 28.07
6 128.7 23.1414
6 131.2 23.99
63122.0 20.67
83.3
814.7
1includes hatchery liberations
2Thjs brood appeared until Nov. 1
3Hatchery Lish liberated at this
point.
perdeds which produced smaller mean lengths than previous ones.
These
rebictions in average size of certain samples appear to be a. nattixai.
phenomena of the older year classes attributed, perhaps, primarily to
the size of sample and eeoondarily to the migration of the larger
sized fish out of the sampling area.
Shapovaioir and Taft (16, p. 88)
found that the larger coho from a.l1 portions of Wa&leli Creek started
migrating first,
The effect of a snail sample size was seen in the average size
of fish from the Coos hatchery.
No migration was poss ibis so the
successive reductions in lengths were evidently due to inadequate
members of fish in the samples
The average lengths £ra samples
of six fish of the 19S1 brood cohos from the hatchcrr ranged from an
init3.al 339. millimeters on March
to 122,0 millimeter's for the
last sample taken on April 8.
There were some decreases in mean lengths rioted in successive
samples of fish from Abernethy and Mansora creeks, even though the
desired sample of 10 fish was obtained.
These variations in lengths
when Ut tie or no migration is occurring, lends strength to the
supposition that there is a wider range of lengths represented in
the older year classes and that a larger sample than toe 10 is necesisary in obtaining a better indication of the growth pattern of the
aider fish.
On this basis, the weekly samples were combined into
mean monthly samples, as shown in Table XI.
Larson Creek fish made the greatest over. all gain
9.9 uzilimetere from December th.tomgh April.
in
length of
Table VII shows that
Larson Creek fish during this sso period had a greater mean relative
L!I
weight of food than did the other streaie.
TLI XI N LIcNThIY LE1GH3 CF 191 BROOD COkiO ANi) ChINOOK 5AIiON
lARSON
No, Lean
ABERNETHY
I'ish L.
Ma.
Month
Dèoeer L3
67.6
January 33
714.6
(czno3)
WLfl0N
No, Noan
No, Lcn
No. 1.lsan
Fish L.
Fish L.
Fish L,
Fish L,
Lb..,
&n,
No. Uo
53
53
3'9
ho
3*
1
82,6*
31
60.1
28
Pebruaiy 23 97.9
141)
82,2
140
22 714.8*
March
b].
33 99.3
8,b 140 80.8 17 83,1*
ipril
28 107.5
146
ho 86.9
95.2
17 79.1k
*Mar1d hatchery fish present in these samples
140
75.14
814.1
19
36
14
101.
91J
9L?
87,1
93,3
nsori Creek, which was not sam'-].ed until Jszuiary, proiced the
least cveraU increment in
owth
f 6.8 millimeters.
Fish from
Abcrnethy Creek showed a gain of 19.9 mi1iteters in average monthly
lengths.
The Cedar Creek samples did riot shc
a consistent length
growbh pattern, var:?ing from 83.5 millimeters in December to 714.8
millimeters
in
February and 79.14 ntilThueters
in
April.
This variable
growth pattern as shcmn in Table XI may have been due, in part, to
size of sample, but more
robably could be attributed to the presence
of hatchery fed fish in ss of the samples.
Most of the hatchery
fish were identified by the absence of fins as a result of a marking
program,
Others, which were not marked, were Identified by the
presence of hatchery food
were included
in
in
thc stomachs
The hatchery Led fish
the table for their elimination wcu1d have reduced
the size of sample
oiid use
In addition, it was not known
if
the
Liilz with nairs1 food in the stomachs at the time of sampling had
not been under hatchery influence at
ono earlier period.
Lie chinooks did not exhibit a regular pattern of growth in
With the arception of the large increase
in
growth shown by the
Larson Creek samples from Jaisiary to February, the largest gain in
length for fish of all streams except Cedar Creek was iade daring
the period of March to April,
The least monthly gain in length was
during the period of February to
'1ie variations Li
arch.
growth increments were emined
to the mean monthly quantities of food
in
in
the stomachs.
relation
Usferring
to Table VIII in the section on food, the mean relative food quantities
in the stomachs for the priod of December to April were determined
for Larson,
nson, and Abernethy Creeks, and are shown
along with overall gain in length.
in
Table XIX
The period of least growth of fish in Larson, uon and Abernathy
Creaks occurred during the period of February to Maroh
Airing this
time there was a reduction in the average relative food quantity from
0.27 per cent to 0.22 per cent, (able Vu). An increase in the rela.tire food quantity from 0.22 per cent to 0.30 per cent was noted
the period of March to April..
in
This increase in relative food quantity
coincided with the best growth period for the three streams with the
exception of the January to February growth increment oi' Z..3 ailli
meters for fish from Larson Greek.
In general, there was a good relationship found to exist betvmen
the relative quantities of food in the stomachs of the sampled fish
from Larson and Abernathy Creeks and the growth increments of these
fish.
The timing of emergence of the fry depended upon the time of
initial egg deposition and the prevailing water temperatures during
the incubation period.
The streams selected for the food and growth study wore rather
wide3.y separated geographically and might be expected to show acme
differences in timing of emergence far the new brood year fish..
differences
in
These
timing ware indicated by the appearance of the new brood
The first coho fry appeared in the Larson Creek samples on arch
dates of March
and 11.
inson Greek, on the north coast, did not
produce any- new fry until the sampling of April 1, which places the
emergence between March 25 and April 1. Abernathy Creek, of the
Willamette River drainage, produced the first samples of echo fry on
April 8.
Cedar Creek of the Columbia River drainage was the latest
stream to produce samples of the new brood cohos
iich appeared en
The chinook fry from the Middle Fork of the Wiflaznette
May 2O
River did nct appear
in
the sampling until May 20.
Table XIII presents the mean weekly sampling data for the 1952
brood cohos arid chinooks
It was noted that in addition to the
variable dates of appearance, as mentioned, there was some differences
seen in the average sizes of the first samples of new fry from the
streams.
tex.
The first Larson Creek fish on March
II averaged 32.6 miii-
in length, while those of Abernathy on April 8 were 36.0 miU.i-
ters and
inson on April 1 averaged 3.0 mifliecters
The larger
initial average sizes of fish, from Abernathy and. Manson Creeks suggest
that the fish of the new brood may have amerged at an earlier date
and for various reasons did not enter into the samples.
On the other
hand, Balding (3, p. 222), in. studying the growth of Atlantic salmon
parr in a Canadian hatchery, found that the size of the egg is the
principal factor determirdng the size of fry of idential species
during the yolk sac stage. He also found that environmental factors
played an important role
is
regulating the growth of salmon during
the feeding period, with tewperature as the iost prominent factor.
The differences in initial siea of the fish in the samples is
probably due to the length of the feeding eriod and growth before
tkBLE XIII
ABERNPHY
LARSON
Mean Mean
Vlt.
No. L,
Date Fieh
193
Mm.
Gin.
VII
32.6
33.8
35.0
36.6
36.8
38.3
37.1
38.5
0.37
o.11
3/18
3/25
lu].
10
10
10
10
9
/15
li/22
14/29
5/6
5/13
5/20
5)27
b/3
6/9
6/17
6/2h
7/1
7/8
7/15
7/21
7/29
6/5
8/12
8/19
8/26
9/1
9/6
10
10
10
10
5
8
6
10
10
10
10
11
10
10
3.0
10
10
10
10
10
10
10
No.
L,
Wt.
Fish
Mm.
Gin,
CEDAR
MUNSON
'.
No.
Fish Mm.
10
3
9
8
10
10
9
36.0
36.8
33.9
37.9
0.12
0.11
0.39
0.63
3.0
8
7
78.3
89.0
1
92.0 10.514
9
99.6 11.35
52.8
2.02
3
12
56.7
2.52
12
63.5
12
70.5
143.5
1i3,2
0.87
146.8
1.17
140.8
o.e14
142.7
0.96
146.2
1.]li
li6.6
14
52.14
1.37
1.81
36.o
35.0
3°.8
2
50.
514.3
1.914
1
51.0
51.2
53.7
60.1
56.1
60.2
59,3
3
2
1414.o
2
1
148.0
52.0
2
2
56.5
1.96
614.14
1.73
1.99
2.90
2.27
3.11
3.01
3,58
0.72
1.62
1.55
1.16
1.15
1.35
1.81
611,5
3.143.
2
2
70.5
65.o
3.95
3.28
72.7
14.85
614.6
3.33
714.c'
8.114
3
1
12
0.91i,
10
3.614
7.07
1.51
0.66
1414.2
3.0
14.214
72.3
75,7
14.23
148.].
0.142
1O.2
6.149
67.14
71.2
68.8
12
140.0
O29
78.6
9
10
10
12
10
5
3.11
3.77
2.79
5
3
0.78
0.87
0.50
7
14.87
68.1
65.3
65.2
10
141.0
142.3
0.146
3,99
3.59
66.6
59.14
10
5.83
6
6
38.0
38.2
38.5
66.3
10
2.06
3.60
0.6].
6.148
2.149
66.0
37.5
37.2
140.2
78.14
55.1
2
6
6
6
72.7
7
1.70
2.17
2.76
3.95
3.85
3.97
3.90
Cm.
7
1.3
1.63
1.95
3.77
2.05
itt.
Mm.
10
53.0
52.1
6
6
52.9
'%.O
67.5
56.7
L,
Fish
3.31
59.14
614.7
3
10
Gin.
No.
Gm.
li.57
55.0
55.1
52.5
69.6
60.8
65.1
li6.e
lit.
Wt,
70.6
50.1.
148.
0.91
1.17
1.23
141.6
L.
Mm.
L.
Mm.
3.38
149.6
8
10
0.614
No.
Fish
No.
Fish
62.14
63.14
51.3
375
MID-WILAME11'E
Mean Mean
Gin.
o.L1
0.50
o.56
0.61
0 61
0.68
1.01
1.05
0.85
2.00
1.78
1.69
2.314
COOS FL*.TCHY
Mean Mean
Wt.
5.22
6.23
5.58
5.35
Z&3.0
143,5
Mean Mean
Mean Mean
Mean Mean
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
1,6
OF THE 1952 BIOOi) lEAR X)HO AND CHINOOK SAIL0N
WIGHT, AND MEtN SAMPLING DA1
AN LENGTHS AI'
0.60
0.80
5
0.3
3
2
1114.0
0.50
0.143
12
76.5
12
83.2
12
90.3 10.62
12
89.8
9.89
12
97.14
13.35
714.0
2.78
5.16
6.33
9.14].
ULE XIII C0)rrIz
IJBSON.
Mean Mean
ti
/23
9/30
No.L.
.
!.
.
Fish
10
30
30
69.6
ls.1s8
65.3 3,73
80.7
6.1.9
E&N LEflTHS AND WEIGM, AND MEaN SAMPLIM) DAT& OF THE 1952
-
£BtNETHT
Mean Moan
No,L. Wt.
(.
Fish Me.
10
8
9
89.1
86.3
85.9
9.1.8
8.75
8.10
COHO AND CHIM)OK S&IMON
.itJNSOI
CELAR
Mean Mean
Moan Mean
Tt.
No.1..
No.L. Wt,
(. Fish Me. Gm.
Fish I.
10
10
10
62.5
6is.5
73.1
3,06
3.31
5.18
3
3
61.7
58.0
2.93
2.39
3070.1Is.78
986.98.57
1069.21..14.
360.32.61
10
10
10
10
10
10
10
10
63.3
3.03
75.7 5.58
2
7
3
lWn
57.0
66.0
66.7
57.0
2.10
3.30
3.73
2.22
U/I.e
.13/25
7
12/1
976.7 5.90
780.06.63
]41
11
W10
1
70.7
78.1.
Is,66
6.01
73.5 p.01
is.0i
8
8.1
8.1.8
7L9 5.32
784 6.57
3
86.3
7.83
66.8
1q15 10
75,8
12/23
794 6.83
8
773.6
3/13
3/20
3/27
2/3
219
tti.6
2/23
3/9
9
10
10
5
10
9
91.0 9.31.
93.910.1.7
92.3 8.81.
90.2 9.17
is
81.0
5.81
10
10
190.08.12
99.83.3.11
92.3 10.73
89.3 9.90
91.6 9.7].
785.08.06
10
7
5
2
1
Fish Mn.
On.
12 106.2 15.39
?!ID-VD..iaMETrE
Mean Mean
No.L.
it.
Fish Me.
On.
2 118.0 20.91
Is.61
p.28
2
694
zs.oy
1
73.8
543
81s.1
7.21
7.88
3
3
12107.1.17.12
3.98
12 111.3 19.25
lid.
366.73.52
2 116.0 20.68
12115.920.11.
1121.022.88
5'].i1.616.95
12110,633.25
393.38.761086.68.30
6.16
1s.96
71.6
68.5
70.0
7I.5
83.9
Mean Mean
Wt.
No.1..
9 98.9 13.78
1417
34113
30
10
10
10
10
10
COOS HATCHER!
00D TEAR
734
1076.2
6.76
5.09
5.96
10
10
10
10
5.63
5.86
7.71
7.02
79.5
71s.9
75.2
83.1.
80.9
65.3
3.25
12 120.8 22.62
273.5
1..36
12121.32I.19
1.
12 122.7 25.91.
2101.011.85
12131.831.89
1077.05.95
10
92.2 10.30.
%.6 11.28
10
95.8 12.00
95.5 30.92
71...O
7.15
2
95.6
89.5
9,79
3.0
8.71.
10
8
8
77.2
65.6
82.2
82.8
82.9
6.00
8.22
2
1
76.5
79.0
5.22
5.67
12 133.1 31.1.].
7.1.0
7.01.
12 131..3 32.21
7.00
12 133.0 29.32
1 113.0 17.1.1
1 1.06.0 12.30
p.)
Ana3rsis of length data
in
The shortcomings for analy, ing growth
periods were
length betsen weekly
cinted out in the analysis of growth for the 195). brood.
The indicated decreases in length for some successive weekly sampling
periods of the 1952 brood (Table XIII) were less frequent and of
smaller magnitude than for the 1951 brood.
grouped into mean monthly lengths as shown
Th
in
weekly data were
Table XIV.
The Overall growth represented by the saniles from each stream
for the total sampling period was determined by adding the increments
between the mean monthly lengths
These increments are shown in
Table XV along with the mean monthly growth and total growth for each
ctreaia.
The greatest ovez'-all stream growth increment for the 1952 brood
echo
s 56.1 millimeters made by iish from Abernethy Creek &ring the
Larson Creek fish aimed 1L9J
period of March 1953 to January l951.
iil11iineters in length from March 1953 to March 1951k.
T1ie over-all
growth increment fron Manson Creek totaled 14.6 millimeterS for the
period of April 1953 to March 195h.
Fish from the Coos batcbel7
gained 95.6 millimeters in length for the years period of March 1953
to March 195b.
This was nearly twice the gain in length of the stream
fish. Although the numbers of fish in the samples of echos from Cedar
Creek and chinook from the Middle Willamette were not considered ada-
quato for comparisons, the measurement data are ineiMed in Table IV
along with those of the other streams.
The combined monthly length increment data from the 1952 brood
i!ONTHLY LE1T}L OF flTh 1952 13R001) JUVENILE COHO
YtBLE XIV
JND CHINOOIC $AWON
LARSON ABERNEThY MUNSON CEllAR COOS WflU,METlE
bat.
1953
March
April
May
June
July
Augtist
September
October
November
Oecer
Jamary
Febrnary
33.8
37.5
1414.6
52,5
61,5
65.3
70,0
73.7
73.8
77.0
93.3
91.9
87.0
37,14
36.1
13,6
39.0
142.9
514.8
1414.14
514.9
IL8 .3.
36.9
67.2
67.7
75.2
85.0
514.3
147.5
60.0
67.5
69.8
57.7
63.8
61.8
61,7
79.8
92.5
102.6
9O.
88.5
88,1
92.5
75.14
79.9
78.6
80.5
85,6
57.6
63.6
77.5
92.0
108.5
109.14
126,3
69.14 121.0
117.2
127.3
133.7
133.0
101.0
77.7
13.0.0
sabnori were exsnixied to deternine the mean monthly pattern of growth.
The first period of March to April showed a conparativeir email growth
increment of 3.7 millimeters..
There was an increase in the growth
during each monthly interval up through the month of June when a
ne.xim monthly growth increment of 10.7 millImeters was recorded.
The growth was lees during the warm summer months with increments
of 6.6 and 7.0 millImeters being recorded for July and August. A
rather sharp reduction in growth incroments wa' noted in September
and October when 3.5 and 0.8 millilaeter8 was recorded.
An increase in the growth increments was observed in the La).]. and
winter' periods from 0.8 mil]ijmeter's in October to 3.7 millImeters in
November and 7.5 millImeters in December.
from the 7.5 millImeter increment
Febraary and to 0.1 millimeters
in
in
Decline
December to 0.
March.
in grcswth was noted
millimeters in
The intervals of least
v4i.9
*j wed. for ?Jonthly Mean
Inorøiienta
ota1 oJ
Februazy
arch
-1.lj.
16.3
December
Jarnzary
0.].
3.2
Noenber
Septber
October
3.7
August
3.7
7.1
7.9
9.0
3.8
lARSON
Li..7
Ju
July
April
hay
rc1i
Jte
56.li
h.14
-OJ.
5.8
-2.3
7.5
11.3
12.8
7.5
9.8
ABMY
t6.6
1.9
5.1
1t.8
8.3
7.7
i.5
-1.3
..0.1
5.6
7,5
2.3
95.6
-0.7
6,Ij.
12.7
10.1
6.8
18.9
7.3
6.3
12.1k
124.6
O,3*
10.2
5,7
51,2
-fla
9,0
-16.2
16,5
8,8
11j
13.9
5.8
LIIDDLE
WLiM!ET2
COOS
ff(TCEERY
l..9
10,6
10.2
6.1
2,0
CEUELR
-r.- -
5,1
L!UNSON
-
_-_ __ .
0.1
3.1
6.7
9.6
10.7
6,8
7.0
3.5
0.8
3.7
COHO 8M.MS
GROTh1
TABLE XV MO?ThLY LEN}T1 INC EMNT5 IN MThLIMETJRS TOTAL I&'TH 0ROW, AND 1EAN L.NG1i
192 BROOD COliC) ANt) CHINOO1 SJL1ON
GRCWI FOR NONTHLY PERIODS OF
growth were October to November, 0.8 milBmeters, and February to March,
0.1 miUimetem.
The maxiimun seasonal growth was made during the spring
and summer period of April to September with a mlithutun seasonal growth
in late tall and early winter.
The yearly growth increments and the mean relative monthly food
quantities for each stream were tabulated in Table XVI.
TaBLE XVI EARLY GROWTh
IEMENTS AND MEN MONThLY FOOD QUAJJTITflS
Larson Aberne thy Inson Cedar Coos Wilaiiette
.ar])T Growth
Increment (mm)
Mean Monthly Relative
Food Quantities
(per cent)
149.S
!6.14
0.214
0.147
I6.6
0.28
1414.8
0.27
9.6
l.2
0.22
1.114
There was a general agreement between the relative amounts of
food in the stomachs and the yearly growth increments of the fish
from most of the streams with the exception of Larson Creek.
the relative quantity of food was not reflected
in
fore
a comparable gain
in length.
The fish from Coos hatchery showed considerably more food in the
stomachs than the stream fish.
This was accomj:'anied by an increase in
length nearly double that of the stream fish.
The seasonal effect of feeding and the resultant quantities of
food found in the stomachs produced some marked differences between
the mean monthly relative food quantities (Table VIII).
These relative
food quantities are tabulated in Table XVII along with the monthly
growth Increments from Table XV.
TABLE XVII L&N MOiTh1Y REIATIVL FOOD QUANTITIES AND GROWTH
ThCRENTS OF T} JUVENILE STR1kU COHOS
Lr
Relative Food
Quantity
(per cent)
Growth
increments
June July
g sept 0t Nov Dec Jan Feb Jar
0.57 0.62 0.37 0.33 0.23 0.21 O.]B o.a o.
3.7 S,7 9.6 ]D7 6.8 7.0
O.h2 0.23 0.18
3.5 0.8 3.7 7.5 O.
0.1
(m1imeters)
The largert monthly growth increments were 9.6 and 10.7 mliiimeters from May to June and June to July knit they do not coincide in
timing with the greatest relative food quantities of 0.57 per cent in
April and 0.62 per cent in Nay.
The differences in timing between
these peak food quantities and the peak growth increments may indicate
A tine differential betwen a period of a certain relative food
quantity and the resultant growth of the fish or no direct relationship between food quantity and growth.
A differential
in
timing between food consumption and resultant
growth is evident but to a lesser degre frem the Coos hatchery data.
Table VIII shows the tea}z monthly relative food quantities of
1.62 and 1.68 per cent occurred in June and July while the peak growth
increments (Table iv) of 12.6 and 12.7 miflineters occurred in the
June to July and July to August intermls.
Some shift of timing appears to be necessary to show a relation-
variable and may be
de endent upon water temperatures.
In suimiary for the stream cobo, there appears to be a general
agreement between the relative amounts of food in the stomachs and
the yearly increase
in
length (Table XVI)
At monthly intervals,
however, there is a differential in tine beten the peak relative
food quantitios and a corresponding maximum growth increment.
(Table
XVII)
GROV1
IN WEIGHT
1951 Brood
The weight data for the weekly samples of the 1951 brood echo
and chinook are shown in Table I.
In general, the variations in
weights followed quite closely the pattern produced by the lengths
which showed a reduction in the sizes of some successive week].y
The probable Bauses for the variations in sizes were dia-
samples
cussed under the section on growth in length.
in weights
variations
Because of the wide
produced by the weekly sanpies and the resultant
irregular growth pattern, the data were grouped into monthly periods
as shown in Table XVIII,
TM3IE XVIII
Month
iE&N M0i2HLY IEIGHTS OF T!-IE 1951 DRool) JIJVZNIIE SAThION
Cedar
Willanette
Larson
Abernathy
mson
bean Weight 1an Weight Mean Weight Mean Weight Mean Weight
Grams
Grams
Grams
Grams
December Li?
January
5.88
February 1O.I9
March
12.35
April
33,79
4.61i,
5.09
6.69
6.95
7.59
7.2?
6.63
9.90
7.00
7.24*
5,95*
5.42*
7.15*
6.08
1O79
8,53
10,09
7.38
8,06
*Hatchery fish present
The samples of coho from Larson Creek showed the greatest gain
in weight from
.l7 grams in December to 13.79 grams in April, an
increment or 9.62 grams.
gain
in
The cohos from Abernathy Creek showed a
weight of 5.26 grams
rcmi L.61 grams in December to 9.90 grams
in April. A very slow growth of only 0.31 grams from January to April
'was indicated by the samples fram Munson Creek.
The samples from
Cedar Creek ehavaad a wide range of average weights from 7.2L grams in
December to 5.12 grams in February and 6.08 grams in April.
These
variations In the Cedar Creek samples were probably due to the procanoe of hatchery reared fish in the samples.
The variation in monthly weights of the chinooks from the Laddie
iTillamette were probably a function of email sample sizes but may have
been exaggerated by migration and mixing of populations
as
might be
expected in large streams.
Shapovalow and Taft (36 pp. 87-aC) found a redaction In the
average size of the migrating year old cohos
the spring.
in Waddell
Creek during
It was indicated that this was due to the early migration
of larger' fish resulting in a decrease in the average sizes of eubse-
quent samples
This migration effect, however, cauld not apply to the
Coos hatchery samples, ithere the decreasing average weights of suc-
cessive samples were presumably duo to the size of the sample.
The differences in average weights between successive monthly
samples of cohos fr'x the streams were comuuted as a proportionate
increase In the average weight for that particular interval by using
thetoznula
IWogW1
Mónth1y 1nteryaa )
1
periods.
The monthly growti rates are ahowi as occurring between the
differences
months for they are cmiputed f
in
mean month1y
gram weights.
LTIVE POOD QUANTITIflS AND LE&N BATES OP OBOW1
tOOD STRE&M COHO COMPUTED FROM
IN WEIGHT FOR ThE 1951
MEAN MONThLT WEIGH'
TkBLE XIX UEkN
Non
nson
Aberneth
Larson
Eel. Ycod Or
Per cent pez cent
November
oCrovth
Eel.
per cent per cent per cent per cent
0.16
Eelood Croitb
(o.)
December 0.36
0.32
(0.09)
(0.314)
Jz*a
0.7
February 0.33
0.23
(0.09)
(0.16)
0.17
0.22
0.26
(0.c.)
(0.32)
(0,12)
April
(0.08)
(0.31)
(0.58)
ILarch
0.26
0.19
0.26
0.514
(0.1,6)
a.0
Means
0.39
(0.30)
0.23.
0.514
(0.17)
0.29
(0.20)
Larson Creek sanples showed an increase in growth rate fron 0.3.i
per cent
in
the Decenber...January period to a peak growth rate of 0.58
per cent in the Jamary-February period. A decreasing rate of growth
was noted in the remaining sanpling periods from 9.16 per cent in the
February4larch interval to 0.12 per cent in the March...pril period.
Abernethy Creek samples indicated the fastest rate of growth of 0.31
per cent was attained
0,09 paz' cent
in
in
the January-February period, dropping to
the February-March period. An increase
in
growth.
rate to 0.32 per cent was noted in the March-April period.
Munson Creek samples did. not start until January.
There was a
Very slow growth rate of 0.08 to 0.05 per cent noted up to the AprilMay period when it increased rapidly to o.16 per cent.
The growth rates in Larson Creek showed ece relationah±p to
the relative food quantities
in
that the periods of large relative
food uantitiea (0.36 to 0.I7 per cent) were followed by periods of
good growth rates (0.31 to 0,58 per cent).
Ljttle direct relation-
ship was observed beten relative food quantities and growth rates
in the other streams for the monthly inter'va151
The mean data from Table XIX for the entire sampling period of
the 1951 brood ccihos indicates a fairly good relationship between
relative food quantities and rates of
roith.
1952 Brood
The mean weekly weights of the 1952 brood salmon are shown
h1e Xi, As an aid
in
in
cating the rates of growth, these weekly
samples were grouped into monthly periods as shown
in
Table XX.
TiBLE XX
tEAN AONThLY I7E1GflTS L GtMS OF THE 1952 BRDOD SkI2ON
Larson
Abernethy
Month Mean
lit.
Mean Vit.
ff
March
April
--
-
0.141
0.59
1.23
2.0?
June
July
August
Sept.
Oct.
Dec.
Jan.
Feb.
March
Coos
i-U1aaatte
Manson
Cedar
Hatchery (Chinoo!s)
Mean t. iean 'it. L4ean t.
Wt.
0.148
0.147
0.99
2.11
.95
3.32
3.72
5.l
14.146
8.214
1.03
2.07
2.99
3.95
!.5
9.30
14.142
.23
8.149
6.10
10.36
7.28
10.143
9.03
14,
6.90
6.55
6.91
7.02
0.99
2.27
2.35
0.55
14.36
1.32
239
7.60
11.29
10,514
3,11
114.59
26.13
2.82
18.29
2,814
26.69
3,71
23.141
5.14
28.91
31.81
3.19
6.28
20.17
2932
The mean monthly weigbt data of Table XX are plotted in Figure
16 to show the relationship in weight growth pattern.
The samples from Abernethy Creek showed the beet monthly and
the moat over-all gain in weight of the stream reared cobos, ranging
from 0,148 grams in April to 7.28 grams in December.
Larson Creek
fish wero slightly heavier than those from Lnson Creak at the
outhly
sampling intervals, with the exception of November and December.
tr
The monthly mean rates of growth
in
were comvuted by the use of equation (1).
weight for the 1952 brood
tabulated
in
These rates of grcnrUi were
Table XXI with the relative food quantity data from
'-4
'-4
U1VU
9t
a$I 9J*09Q I17&14 0
zg;t ao*a 090 Ut1
*Ti IXZ*Y9
1ODU*
I* *&
i.
ible VIII to show the relationship of food to growth.
In general,
the periods of greatest growth followed those months which contained
fish having the largest relative food quantitice.
The mean monthly relative food quantities were found to be compa.
rable for all streams with the exception of Larsen Creek fish which
showed nearly twice the average relative food weight of the other
coho streams.
There was a close similarity in the comparisons of mean food
and growth relationships between the two inland streams of Abernethy
and Cedar Creeks
Abernethy Creek fish, with a relative food quantity
of 0.2 per cent ethibited a growth rate of 0.9 per cent while Cedar
Creek fish With a mean relative food quantity of 0.26 per cent showed
a mean gain of OJLI per cent
in
rate of growth in weight.
it is not iuprobable to assume that under optmwu conditions
of
tenperature, there is the possibility that a better utilization of
the available foods would reflect in increased lengths and weights.
This is suggested in the greater rate of growth by fish of the inland
streams over fish of the coastej. streams
Fish fr
the inland streams
of Abernethy and Cedar Creek with an average relative food weight of
0.
per cent showed
rate of growth
in
weight of O.1S per cent.
Fish £rori the two coastal streams of Larson and
inson with aproxi-
inately O.li0 per cent relative food weight had a mean growth rate of
0.33 per cent.
Comparison of the relative food quantities and growth rates for
the Coos hatchery fish show a mich larger relative food quantity for
the rate of growth in weight than for any of the stream fish (Table
UI). The relative weight of food for the Coos hatchery was l.03.per
cent with a growth rate of 0.39
ax' cent.
This, when compared to the
mean relativo food weight of the stream fish of approximately 0.33
per cent and a mean growth rate of 0.39 per cent might indicate that
the strain fish had a higher food conversion than did tire hatchery
This was found to not be thre when the total gain in grain
fish.
weight for the stream fish sannlos and the hatchery sanples were
compered.
Thzring a comparable sampling periods, the Coos hatchery
fish samples indicated a gain in weight of 29 grains while the mean
gain in weight for the stream fish was 10 grains.
Tims the hatchery
fish with a mean relative food weiglt of approximately Three tines
that of the stream and an equal growth rate of 0.39 per cent showed
a gain in gram weight nearly three times that of the stream fish.
This would indicate that the food conversion factors for the stream
and hatchery fish were comparable.
The uonthly growth data of Table XXI show the greatest gain in
rate of growth of the stream echos
as made during the spring and
sur months, April through June, with a peak rate of growth of
0.73 per cent recorded in the April to May period.
Cohos from tire
Coos hatchery likewise showed the greatest gain in growth rate during
the same period with a peak growth rate of O.81L per cent in the April
to May pertod. A general downward trend in growth rate was noted
through the eunmter and fall months with a minimum growth rate of 0.11
par cent for the stream echo recorded in the October to November
period.
Coos hatchery fish ethtbtted. the smafleat growth rate from
Novc,br through January.
Ti? ;
March
0.89
0.89
0.39
0.39
April
0.30
0.98
0.26
1.17
June
0.50
021
0.27
0.23.
July
August
0.35
0,2I.
0.17
0.20
0.25
0.27
0.20
0.27
0..Ji,2
0,114
December
0.37
0.21
0.11
0.18
0.33
0.22
0.12
0.89
0.79
0,. 26
0.22
0.27
1.02
0.28
0,20
038
0.11
0.0].
0.29
0.22
0.58
8.58
Jairnary
0.26
0.27
0.27
0.23
0.15
0.85
0.22
0.13
0.20
November
0.39
0.35
0.59
0.11
0,10
0.16
October
0.26
0.22
01.115
1.68
0.33
0.28
0.28
0.33
0.18
Septiber
037
0.26
0.21
1.62
0.69
0.88
0,13
O...ljO
0.33
0.11
037
O*1
0,70
0.69
0.76
o.65
0.06*
030
0.. 814
1.20
0.62
o..0
0.76
0.53
0,73
0.72
0.75
o.7t
0.149
1.32
0.57
O.Li3
o.85
0.15
0.68
0,09
0.c
February
0.18
March
0.25
0.20
0.19
o.ib
Mean
0.50
O.7
0.
0.2{
o.814
0.114
0.26
OJ1
*3amp1e probably not characterie tic of actual growth - not incbided tn mean.
i3
p.39
constant The
weights. and length of lags the to drawn line a of slope
the from derived wns
expressed and 10
iz
of exponent £he
x W K formula
factor condition a as it
the developed he 120.) p. (10, work
later a in somewhat formula this Rofining
of length
L and constant, a
as relationship the
27)
p. (9, Hile
miUimetors. in Limb
C grams, in weight fish
erprsed he
11
where
where formula siiiiir a used
life, of remainder the for limits, narrow rather
within to, acUierred is
and.
life embryonic post early in established
fozauia the in cubed length the of
is form the that stated He
wfL3.
function a as expressed was fish the of weight the where boo) p. (8,
Hecbt by examined was length and weight between relationship The
factor, condition the of value inerical
nu- the
in
changes in result which weight or length
in
measurements
the affecting factors to given be can interpretations various ship
relation- this From
length. fish the to weight the of relationship the
of ion exjaess an essentiafly is value K or factor condition The
FACTOR CO})ITION
eaten. food of amount the to proportional roughly is made growth
the 50° below temperatures average with that found he where trout
brown of study a in relationship this qualifies b73) p. (13, Penislow
trout, in rates growth and stomachs the in food of amounts the
betwexi correlation close a maw be where 1b6) p.
(1,
Allen of tindings
grcwth of rates the in noted decrease a wes
the with compares This
stomachs. the in
there food of amounts decreasing With
fnd
were
quantities food reltive maxthumi the when periods the during occurred
was used to produce convenient units with ithich to work,
of
In certain species of fish there
relationahtp.
is
scue deviation f roan the cubic
Carlander (Li, p. 130) in his study on the Tflibee
found the relationship ol' weight to length to be 'W
Iii
practice, hcwever, in adapting the £oila to a condition factor, he
used a cubic relationship,
Condition factors have been need by various workers to express
the relationship of a fish to tts environmeit.
Surber (17, p. i9)
expressed the condition factor as a measure of pbampness in relation
to length and used it as an indication of over stocking in a strean.
Klack (12, p. 282) in a study of trout, uses the cubic relation-i
ship to indicate the suitability of an environment to various species
of ft
He also sugosta that since condition of a fish population
appears to depend upon the amount of food available, the average
valaes of K at any particular period of year may indicate the aburitzme
of food in a stream.
Phenicie and Bishop (ib, pp. 163-16h) used the
K factor, sinirly, to express the relationship of length and weight
in terms of a state oi' nourishment and. relative heaviness.
These interpretations of a condition factor may app]y to most of
the situations encountered by workers in length-weigbt studies, with
the final analysis lying not in the resultant nueerical values of K,
but in analysis of the factors
rothcing the changes in lengths and
'weights.
The condition factor formula K =
(2)
indicates that there is a cubic (r3) relationship between the length
aM 'weight.
As a check uon the applicability of using T) in expressing
the length to weight relationshiD of the salmon, the vabie
of
the ex-
ponent of L wa determined by the formula
n
T.oj L)
(Loj)
(Log W) -
.
£(Log W)
(3)
N [Iog L) - (Log t)'
where ii is the exponent of L and expresses the length to weight re-
The values of xi were ccmited for the fish fron alL streams with
the exception of cedar Creek, which was excluded due to the presence
of hatchery fish in some of the samples
The computed values of xi
for the sampling areas are:
kLbUL
The values of xi do not differ appreciably from the cube relation-
ship in formula (2) which was used to compute the condition factors
It was not practical to compute individual condition factors due
The mean condition factors by stream and length groups are shown
n Table XXII and plotted in Figure 17,
°-.° OQOS HL?GliZni
E
o--.
-
J5¼;
-
II
----
tH
7
11.1
/
I
/
-
,-
__..
/ ---------.
,
H
"1
HFIGURS 17 QOWDITION FACTORS OF TRE 1952
BOOI) COkOS iD CHINOOKS BY S1h3 GUPS
0
71.
TM3LE UI1 CONDITZOI ?AC)RS OF 10-MILLflER GROUPS OF 1flE
1952 BROOD SALMON
10-eiUxster length
3039
10i
I9
1.1U
Abernejhy
T
£aon
1.(
93
)..23
an of
1.01
coho streams
J4tinon
Coos
Hatchery
1.13
5059
b0-
,
a
6
7)79
O89
.
.
110119
120129
1.(
1,16
1,10
1.18
1..
1.25
1,19
1.20
1.20
1.21
1.iO
1.12
1.!8 i.bo 1.38 1.32 1.31
1.21
1.2I
1.
1.07
1,
1.16
1.25
1.25
1.22 1.36 1.15
100-
1
1,
1.18
1.29 1,27
1,19 1.
1.25
ou
9Q99
Middle
Wi11ette 0.92 0.9b 1.16 1.22
1.]1
1.09 1.10 1.08
1.15 1.27
(Chinook)
The condition factor for the ne'sty hatched fry in the 30 to 39
millizieter group for all sampling areas was lower than for any other
size group ranging from 0.92 for chinook and 0.93 for Hunson Creek
ooho
to 1.(
for Larson Creek fish and L33 for Coos hatchery fish.
The condition factor for the stream cohos showed a gradual increase
to a peak of 1.25 recorded in the 50, 60 and 70 niiliinster size groups
with a decline noted
in
the larger SizS groups to a miniimm of 1.10
in the 110 to 119 millimeter size group.
Condition factor of the cohos from Coos hatchery was greater
In all size groups.
Chinooks from the Middle WI'! 1
'ette showed a generally smaller
condition factor than the echos for all size groups with an in-
creasing trend in the larger sized groups where the coho were shcing
a decreased condition factor.
Allen (2, p. 21) in his abidy on the Atlantic salmon found that
at the beginning of the growth period when the condition factor was
72
low, the rate of feeding was rapid.
For a time during the early swmier
the weight increased rapidly without an equivalent increase In length,
resulting
in
an improved condition factor. As the difference between
weight and length reduced, the K values also reduced and finally be-
came steady. At the end of the summer the rate of growth in weight
decreased resulting in a reduction of the K values
A similar situ-
ation ms indicated by the data plotted in Figure 18 where the condition factors of stream reared echos were generally law (0.78 to 1.13)
in
the spring during the early months of life, increasing rather sharp-
ly to a max iumaean condition factor of 1.33 in mid-summer then decreasing gradually during the fall months to a mean
of
1
.
The K
factor of fish frc. the Coos hatchery followed a similar pattorn from
a minimum, condition factor of .l.17 in March to a maximum of l.!8 in
July, then decreasing
in
the fall and winter months to an average 0.1
1.32 from October to arch.
The food and condition factor relatIonship v.as examined through-
out the entire aaipling period of the l92 brood echo.
Table XXI shows
a maximum relative food quantity of O.57 and 0.62 per cent during the
months of April and L
with the pak condition factors not occurring
until July and August as seen in Figure 18.
These data show a time
differential of approximately two months between the pe*
of the
relative food quantities and maximum condition factors. A closer
relationship in timing was observed in the data from the Coos hatchery
where the maximum relative food quantities and condition aetors
occurred during the mouths of
and. July.
The relationship of condition factor to relative food quantities
r
'I
L
/
,4-f/\ //\
1/
I
\
r1*
f
\/
/
/
-
I
:1
--- LABBOI ______
/
JJ6OJ
ii /
--+ ABB3?HT ORZK
IIf
4il6tBOD
$195EBOD
/
*
18
D
P14
*
4 $0 ID J
1
VW1'HLY CONDITION FACTORS OF THE 1951 AND 1952 BROOD STREAM REARED COHOS
WITH THE
AN FOR EACH 1)NTh
*
714
.5
1.5
- - - FOOD UANTITT
CONDITION FACTOR
1l
1.4
1
1.5
.5
hi
.1
z
0
8
0900
1200
1)0
1800
2100
2400
0300
0600
HOUR OF SALING
FIGURE 19 RELATIONSHIP OF FOOD QUANTITIES AD CONDITION
FACTORS AT 3-HOUR SA]PLING INTERVALS IN lARSON CREEK
for different periods of a day is shown in Figure 19 with the data
plotted frcmi the 2l-hour sampling period in Larson Creek.
a silarity ui the trends between samping intervals
in
There is
that an
increase or decrease in the relative food quantity was generally
associated with a sinilar trend
ah
in
the condition factor.
This relation-
of food to condition factor and time of sampling is shown to
illustrate that the variations encountered are dependent upon the tine
of day that the fish samples were taken
The relative food weight data in Table XXI show that the hdtchery
food formed a proportionately greater part of the total fish weight
for all monthly periods than the stream food did of the stream fish
weight.
The larger values of condttion factor for the hatchery fish
over those of the stream fish were, In part, produced by the greater
relative uantitiee of food in the stmiachs.
Condition factor values of fish samples fran the hatchery varied
according to the time of capture in relation to the feeding period,
the amount of food available or feeding rate, and the capacity o
the fish to feed in wnters with certain seasonal variations in temperstores,
The condition factor values for the stream fish, although much
less affected by relative food quantities, did show some variations
in relation to food quantities as shown in Figure 19 fran the 21
hour study on Larson Creek.
The use of a nimierical condition factor for any stream or hatchery
as an Indicator of the relative well being, condition, or food situation would be of value only when compared to a standard
opt4m rMae
of condition factors established within the llmits of seasons, temperattLres and size of fish. Although the ccndi.tion factor for the stream
reared cohos and chinook was generally lower by seasons axd sise of
fish than the hatchery fish, this may not be an indication of a poorer
condition
For' the streams in this stud', the range of condition factors for
Juvenile coho varied from a mean of 1.00 in the spring to a peak of
1,32 and 1.33 in July and August and decreased to ].23 in November.
These iraues of K would be considered too icis for' the Coos hatchery.
fish th1b ba4 condition factors of 1.21, 1.8 and. 1.2 for the
respective periods of time
U&RY LLL) GLU810148
Results of the food analysis show a marked seasonal variation
in the kinds, numbers of organisms, and relative amounts of food
in the stcnach
of stream reared juvenile sainon.
The young salmon
fed predom?aant1y upon the bottom dwelling fonus of acuatic insects,
and primarily upon those organisms of the Dlptera group.
A greater food quantity in relation to fish weight was found
in the stnuachs of the 192 brood salmon in the spring months of
April and !y than at an; other time of year.
The 191 brood salmon
sampled duri.ng these two months had a relative food quantity about
half that of the 19 2 brood sampled at this same time
suggest that the snaller fish eat
These results
orc in relation to body weiht
than do the larger fish.
During the suznuer' nontha the relative airounts of food in the
stanachs ct' the 192 brood echos showed a decline from the peak of
77
the spring months,
This reduction in food is presmably due to a
ccibination of food availability, s±ze of fish and high water tempez'w.
aturee.
Reslta of the three hour interval sampling during a 2I hour
study on IJSrSQU Creek, showed a considerable reduction
in
niibez's of
organisms and the relative food quantities in the stciaths of fish
sampled in water above 76°F.
The axinwi growth rates of both hatchery and stream coho
generally occurred during the seasonal periods when the fliaxa
food quantities were found
in the stachs.
The hatchery fish ate
considerably rAlore Load in itlation to the rate of growth than did
the stream fish.
This greater quantity of food frc
fish over that of the
tro
the hatohory
fish was reflected in a ccnparable
increase in gram weight of the hatchery fish.
The difference in tining betreen ionth1.y peak food quantities
and peak growth incronts ma:; indicate an absence of a direct association betseen food and growth and that the food may be actie.t
less critical than other factors or that the saipling and methods of
analysis were not adequate to demonstrate this relationship.
Condition factors of the hatchery fish were considerably greater
than those of the stream fish during all seasons.
The use of the
condition factor as a measure of well being of the hatchery ox' stream
fish should be limited to a coranarison with standard units established
within the lirnits of seasons, temperature, and size of fish,
The range of condition factors for the stream cohos varied frczt
78
O.9
in th
upring to 1.33 in the sier and 1.23 in the winter.
These factors would not be applicable to the condition ci' the Coos
hatchery fish which varied fra:i l21 to 1.58 and 1.25 for sixiilar
periods.
The effect of water temperatures over 760 may have a disrupting
influence upon the behavior and feeding pattern of juvenile coho
salmon and could be a factor Uniting the production of this species.
BLIOG11APHY
BIBLIOGRAPHY
Continued
13.
orth and food conPentelow, F. T. i. The relation beton
sumption in the I3roni trout, Journal Experimental Biology.
1939.
l6:1116-1473.
ih.
Phenicie, Charles K. and Clinton J. Bishop. Condition factor
alinement charts. Montana State Departeent of Fiah and Game.
Progressive Fish Culturiat, 1950: 163l614.
15.
Reimers, Norman. Conditions of existence, growth, and longevity
of Brook trout in a small, high-altitude lake of the eastern
3ierra Nevada. California Fish and Game. Vol. 144, No, b:
328-322.
L9
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7,
10.3
I
12
9,6
14
I
0,8
a
9-3
73
51
7.3
1483
17.6
69
1
2.5
6
14,8
133.
5
23.2
3.0
5
5.6
6
2
5.1
6
353
616
16913
6
17.6
12
3.0
9
20.0
25
3
3].
29.0
35.0
8
7
2
2
1.7
6.5
5
9.6
12
14
5.8
10.3.
143
10.1
9
16
8
12.8
8
20.6
22
1.9
10
2
17
114.5
7
7
6.0
2
214
2
1.7
2
7
22,1
35.2
19
1
0.9
1
C
B
A 175
S
1
7
U.).
40
0.3
I
11
0,7
3
8,8
222
32
32
19.0
356
UT
U.S
2
2
0.3
3
0.3.
I
I
7
0.3
S
0.1
2
21
31
31
1
1
1
0.3
6
6
0.3
7
0.3
8
3
2,8
10
16
6
1.6
U
53
5
2,2
8
là
7
1,2
12
7
9
0.3.
1j2
14
1.7
6
4
3
1.1
3
3
0..8
21
11
77,6
280
2
2
78,9
14215
3252
66.8
25
53
11.2
70,8
283
1788
1146
7,8
1.7
42
14
I
8
90.9
751
5.6
i6
8
3
0.8
1
13
8013
0.7
7
3
0.3
8
10
0.2
19
8
3
12
0.6
U
0.6
9
0.5
12
24
1.5
39
0.1&
2
1
0.1
0.7
33
U]5
1.0
18.20
1.1
38
39
24
1.5 1.7
61
1.3
0
0
1U1
0.1
0
C
B
12.A.
C
a
22A.
iI
B
C
8o89
70.i..79
b0..1s9
lnmm.
interval
Length
UA
::
//
S
*
a.
SS
S
V
I
S
S
a
a
.
S
.5
S
a
V
£
a
e
-7
a
S
*1
.-
-
-
a.
I-
Trtohoptera
Armeli4a
Rydraaartna
Hoaoptera
Coleoptera
phem.ropters
Plecoptera
Diptez'a
No.oftS.sh
'
oc
r
'0
o
'r- r°
1-
NV1.
i°
*
Li,
O
r-
o.
N$
-r"
C)DJ.
°'.'
r°
'.o
.
cz
"r-
ts
*4
"r
*4
*4
Qi$ awp*
/
TABI
V
ANALY$IS OF STOMACH CONI1NTS OF COHO SALMON FRO1 I/&RSON CREEK, TRIBUTARY 0I' 0oc BAY,
J(E TY1ES OF )ROA11ISS EMEN.
ABRANCED ACCORDING 10 TIME PERIODS, SLE OF FISH, AD
TO
MARCh
17, 195b
PERIOD 01? DECEMBER 23, 1%3
Percentage of total number eaten.
A z Nnber of each type of orga4isl!I eaten. B
Nimber of stomachs containing this organism,
O
30-39
13A
b9
C)
P4
30
9
9
3A
35
3
63.6
3
S,b
C
26
22.0
9
12
B
C)
!.6
0
2
rl
c
r4
ia..S
6049
§4
§4
4
I
I
$
inmra.
5
9.1
2
118
1
1
2
a8
1.7
2
2
1
3.
3.
3.6
1.8
i.8
2
1
1
1,8
1
3
5.
7.3
3
1
317
70-79
12
B
80-89
9.7
o
11
32 A
3S1
B
90-99
6
7
C
32
12
19 A
B
C
135
15
5
129
9.7 19.2
21m.
,6
141.5
28.6
22
80
i8
5.5 2l.6
9
3.3
10
65
2I
3.6
1?
.3
1.7
1,8 tI&
8
1
3.
2
0.3
1
7
7
1
1,0
6
1.0
5
0.2
1
1
1
0.3
6
1.8
1
2
1
1
0.3
0..2
1
3
11
39
1.6 5.8
7
3.
23.
6
3.
0.9
2
0.2
1
3.1
712
1
h
11
53
1.2 16.3
t.
7
Li
1
3.1k
0.3
6
1
A.L1SIS OF STOMLCH CONTENTS OF COHO $AUON FROM 14.RSON CREEK
UBUThRY OF
CCC'S BkY, ARLNGiD ACCOIU)fl
TO T]
PE11.IUDS, .3Lh OF F1H, AND
JQR TthS OF
CONTINUED
B1E V
ORGANI&iS EMN. PERIOD OF DECEMBER 23, 1953 TO MAJLC}I 17, 195b
C
* Miez' of each tjype of organism eaten. B
Percentage of total number eater.
Number of st,omacha containing this organism.
M
S
4.
i
4.
intervaf
I
inmu,.
I
I
I
Tt
4.
r
1oo-1o9].iA
B
109
37.9
10
18
6.3
B
9
50.0
2
13.1
C
2
3. A
1
C
UO-1192A
120-129
B
33.3
O
1
96 A
8147
B
C
21
8.14.
7
62
14
21.6
6
2
1.14
2
0,7
14.
1
2
0.7
1
33..3
1
0.7
2.3.
3
2
5
1
2
5.6 U.).
3
16.7
2
3.
1.0
1
1
3.5
3
3,
5.6
1
1
33.3
3.
107
139
39
6.0
147.2
7.8 22.0
60
88
56
39
18
1.0
17
17
0.9
1
10
1
8
2
7
2
109
19
1.1
6.1
'5
26
58
3.2
3
19
1.1
6
5 1793
03
3
¶1YtBI
VI
ALYSI
F SIOLIfLCH CONTENT OF COliC) &I2OI' 1tOM LU3ON OikEK, TRIBUTARY OF TILLA&OOK
TYPES 0?
RIVER, ARRANCD ACCORDING IO TD4E PERIODS, SIZE OF FISH, AI L!kJ
QRGANISL!S ETIN. iiIOD OF JAUARY7, 19S3 TO
CH U, 1953
A
Nuaber of Qach type of organiszi eaten. B
Porcontage of total number eaten,
C = U.iithez of 5tomath contaiiing th13 organism..
I
B
C
60-69
13 A
B
70-79
22 A
263
10 A
C
ISA
B
C
2
123
58
5.b. 26.1
U
B
90-99
2
C
B
C
80-89
51.8 12.9
9
185
19.5 22.3
20 U
592 159
58.0 15.6
2I
39
2Li3
56.5
15
7
1,6
5
6.
2
12
5.14
7
23
14.0
9
58
5.7
28
I
3,2
1
9.7
1
10
l.5
3
6
2.?
b
U
102
10.0
26
31
123
7.2 28.6
6
10
7
9
9
2.1
14
2
1
2
0.9
Li
0.5
1
I
7
1
O.
1.8
2
1
5
0.5
5
1
0.2
1
.
6
1.0
3
2
1.7
9.7
1.6
03
I.9
3.2
1
1..
2
28
I
I
1
0.1
1
10
1.0
lo
2
0.5
2
0.6 1.2
3
2
19
3.3
5
7
8
7
0.7
0,8
0.7
6
3
Li
1
0.2
1
2
1
0.5
1
9
1.6
1
0.2
7
1
1
0.2
1
2.5
7
0.7
0.2
6
2
i6
222
2
6
1
1.14
0.2
3
1
568
1000
14214
23i5
0.14
0.2
9
14
14
10
32
2..0
148
1
70
U
1.2
28
1
6
1.
8.
l.t
i4
1
33114
0.9
0.6
20
S
316
0.8
19
0.1
3
1911
0.6
13
i.1
1.
3.
1
1
1
1.14
314
2
2.8
2
514
935358
17.6 55.5
11.6 5.5
1301
272
330
118
3
1.
5.6
a
2
7.0
6
6
61.0
1i3
C
B
A 99
C
B
100-1096A
0
0
Cl)
*
r4
inn.
intervalo
.r4
I
Lengti
oran.
total ot Percentage
eaten.: rnber
containg
t.i1
eaten.
C
stornach8 of rnber
o type each oi Niznber
organm
A
EL
ORANIBL OF
193 U, MARCH TO 1%3 7, JANUM( OF PERIOD
TPE8 .cr.JOR ND A FISH, OF SLE FFRIODS, T]1 ID ACCORDING ARRANGED E]ViR,- TILIAMOOK
CONTINUED
OF I1?D3UTAitY CREEK, UU3ON FR(I S4L1ON 00110 OF. CONTENTS STOMACH OF AN(LYSIS
VI
T&BI
M&LYSL OF STCACH CONThNT OF COliG SAi3ON FROM 1JNSON CREEK, TRDUTARY OF TILIAMOOK
t1WES OF
SIZE OF P1311, A13) MA.JO
RIVLt., A1UNGED ACC(WflG TO TE HRIODS,
PERIOD OF MA.RC}I 17, 1953 TO JUI
OROAiUS FJIEN
10, 1953
T&BLE VII
A
C
of each type of orgaaiinrn eatex. B * Percentage of total irnrer eathn.
Nwuber of stomachs containing this organia.
Thiiuber
0
£4
p0-59
6&-69
o
0
b9A
371
51.1
72
.1
C
1I8
2h
143 A
14.28
195
19
i7
2.9 7.1
12
19
17
55
7.2
29
B
55.9
C
1i3
28
£2
77
12
7
3.2 A
.5
B
514.2
8.i
C
12
3
8 A
1214
B
C
779
$
$
B
b9
0
+
Length
nterra1
nrga.
3O-i9
c1
+3
U A
B
C
149.8
2b
9.6
2.2
2.3
59
14.9
16.2
0.3
p9,.
114
1.8
2
5
0.7
2
0.3
2
15
1.9
9
5
0.8
7
0.9
5
0.0
5
1
0.1
1
2
0.3
2
3
0.5
2
18
2.7
3
22
0.14
660
l0
2.9
16
0.3
1
11
5
7
3.
6
2
2
2
0.7
14.2
1.14
1
0.7
2
14.9
i.h
1.14,
1.14
14
3.
3
2
3.
2
5
7
2
765
2
2
2
1h2
3
1.2
3
14
1
2
26
1
2.0
1.2
1.6
0.14
0.8
10.14
2
1
2
3
1
2
o.b
1
6
2.3
7
V
I
0.8
7.].
2.6
10.9
0.14
2
1
1
142
8
8
8
85
56
U
149
31.9
a.o
C
2
1.14
0
r4
5.6 29.6
114
8
U
9
C)
C)
ç4
Lk. i.J4
8
5
14.
2
19
6
6
2149
1
265
TkBLE VII
CONTIIUD _ M&LYBIS OF STO1ACH CONTENTS OF CCHO SAIJON ]OM ?.IUNSON O1.EEK, TRIBUART OF
TILL&LOOJ RIVER, ARILNOID A000IiDIJJG TO T IIvE PERIODi, S12E OF FLu-I, AND AJQR TYPES
OF OtGfUJL'$LiS EA1EN. PRICD op LARCH 17, 1953 TO JUN} 10, 1953
Number o each type of organisn eaten.. B
Percentage oZ total number eaten.:
L!umber of tonaohS containing this orgisiri.
A
C
Lengthç0
thterval
inm!i1.
$
0
C)
C)
80-89
2? A
B
C
90-99
35 A
145.2
3133
B
133.2
0
31
100-109 iS A
B
C
110-119
208
3A
B
C
203 A
B
C
6?
]JL.6
U
65
8.2
214.
18
3.9
10
20
2,5
13
U
96
20.9
20
170
27
5.9
iS
91.
21.13
11.8
30
29
181
37.5
13
21
t.3
23
1
2
36.5
3
1.6
3.2 30.2 19.0
1
2
101i6
147,5
191,
2.3
1142
29.14
713
15.3
71513
19
3
613
119
614.3
3.1 i6.6
15.8
1iO
115
714
6
6
,3
6
26
90
13
12
6
1.2
5
3
6.li.
1.3
3
3.3
12
2148
r4e
,.-t
51
13
35
1
0.2
1
0.14
2
2
9
14
1.1
0.5
9
13
1
0.2
1
8
C
ii
E4
2
0.24
1
1459
13
3146
.8
'3 12
0.14.
790
0.
3
7
1
1.13
0.2
2,5
0.8
S
3
1
6
3
12
1
1.6
1
1.6
1
1.6
3
I
3.
1
3
1.3
29
38
141
1.0
33
1.1
19
13
23
o.6
3
.114
183
14.7
713
U.3
2
1482
63
13.8
3
I
5.13
2.9
51
II
13
0.3
10
TABLE VIII
AN&LYSI OF 3TOMPCH COENTS OF 00110 SAL O1 FItOM iJNS0U CfEI., 11L...0 RY OF TILIAMOOK
AIGE ACC0{DI1 TO T1hE 1'ERLii)-, SILE OF FI.i Ai AJOi TLPJ OF
it1VIR,
ORGANISM FVE. W1tIOL) OF JUNE 17, i93 TO
16, 1253
A " Number o1 each type o organi8I eaten. B
Percentae oL tot1 rrwnber eaten.
C
Llumbez' o
toiChE citaining this
ranisn.
$
Lenth
intera1
g
L
339
3A
B
C
14049
0-!;9
60-69
70-79
146
I
13
13
1,
69.?
7I!
1.
6.1
6.1
ii
1
1
2
2
1
3
'
10
42
B
139
66.3
C
32
20
14
23
i5
6
148 A
76
62
2!;
176
?2
1!;
33 A
9.14
71
0.6 10.7
B
70.3
C
18
26
1.8
13
33 A
!;37
28
114
B
62.!;
C
33
16 A
B
O
307
61.8
16
14.
3.3
12
]t
3.2
6
12.7
3
1!;9
3.8
!;.2
32
61
7.1
1..?
16,!;
9
26
2?
13
85
130
2.6
8
17.1
ih
8.05
114
1.!;
0
12
1.
3.0
2
3.0
1
2
2
1
0.2
1
o.6
12
1.1
0.9
B
9
1!
1.7
U
14.
2
0.8
O.L
14
2
.?
14
114
16
19
1
i.b
16
0.1
10
19
1.2
2.2
5
66
3fl
1.1
8
113.
9
1.8
6
9
.O
o
II
a
62
7
1
1.1
0.6
4)
1.
13
6
3
1 1388
0.3
3
o.14
5
0.2
1
1
2
2
1
2
0.2
0.
0.2
2
2
0.1
1
7
2
2.2
1.13
o.14
6
6
2
0.1
2
1396
19
0.7
2
3.7
C;F
3
3
4!
1.6
2.2
79
37
!1
i.14
1
1
0.7
.
37
66
C
B
A 138
90-99
238k)
137
6!.3
A1
1714
14.8
1
10
1
27.0
B
B
C
2
C
1.7
61
.h
14
1
rJm. in
interval
80-89
6
148.
-
VIII
ThBi
LenCth4
j
0
1
C)
0
A
0.7
C
i
1
i.S
2
r-1
-j
stomachs of 1iiber
each of unber
t'rpo
17.2
14
22
9J
1
9
110
6.3
114.8
229
14O
$
0
0
18.7
14
2
0.
11
2
7
Xi
.2
0.3
1
19
33
0.8 1.14
3
28
3.
1.
2
0
P4
..
sci
CF P1UOD
EAi'EN oRGANiE3 QF
17,
A R1V1i, 11C;O TILL
TS TO
ACCORDI NGI1
c
OF YSi;3
A - mTuT.D
coirENT;
FRC srno; coiio
3L IIUODS,
SFPTLmtR TO 193
organism. this ontairdng
o.
total of Percentage = B eaten. rganisrn
6,
.IiSc
kIH
TkBLE U
ANAL1LSIS OF STOMA.CH CONTENTS OF COIO
RIV1,
SAUON FROM LUON CREEK,
AJOR TYDES OF
F&NO]) Acc(BnIrn TO T1E PtIODS, SI7E OF FI$H, AI
ORQA.NISMS EATEN. PD FROM SIP L'FlBER
A
C
tIBtrB&RY OF TILIAMOOIc
1953 TO DECE1i3ER 16,. :1953
,,
Percentage of total nunber eaten..
!zmber of each type of organism eaten. 13
Thmber of etonachs containing thi3 oraniarn.
Length
inter'ta1
"'
5()-59
r4
16 A
2V
53.13
B
C
70-79
80-89
9.99
38 A
13.9
351
55,0
27
56
28
1493
91
10.0
20
513.5
C
35
33 A
B
C
398
B
0
21.
9
B
hA
114.0
8
15
2? A
6)
8.8
33
332
133.6
113.5
31
18
77
148.13
.10
15.7
5
I
o
o
B
60-69
2
U
13.13
37
6.6
10
107
16.8
].h
21
3].
.1141i.
3.14.
16
33.9
27
63
178
6.9 19.5
15
23
20
14.?
10
9
i1.
2
2.2
9
0.3
2
59
6.5
21
21
2.3
9
3
0.3
3
35
16
5
0.5
3,8
18
1.8
2
1.3
2
214
7
13.14
33.1
14.14.
7
3.0
6
14.2
3.9
12
7
5
13
18
14
9
17
2.7
9
1
0.2
1
6
0.9
14
12
11
1.2
6
27
10
22
2.14
512
1.1
5
3
1
3.1
2
1.9
0.6
1
3.0
2
7
26
6.1
5
16
3
0.7
2
U
1
0.2
1
1
2
0.2
0.3
2
2.5
9
1.7
6
0.3
2
2
0.2
13
1.3
7
0.8
7
13
1
1
0.1
1
2
8
2
2
0.2
23
2.5
7
0,8
6
0.6
2
12
13
14
2
1,2
1
0.6
1
2
o,6
1
903
13
8
1
638
0.13
0.9
6
3
1.9
3
14.29
910
158
3127
9!
35
38
3.0
13
0.5
S
1
2
2.2
290
8
0.2
8
3.
I
ih
1.1
:15.6
ii
19
o.b 0.9
293
1
1.1
h3
27
86
12
O.S
35
38
2.3
71
2
0
0
1
l4Ji
9
1
28.9
26
0
0
a
r4
0
P4
39
60
67
35.8 .6
b.9
176
25
L9I4
2
10.0
I
'0
J4
C
a
41
6
U.?
368
1
121
0.2
3573
3
27.8
C
B
A 128
C
B
3A
I
c
0
0
4
2
I
100-109
ina.
1nterva1
ngth'
$
'0
$
C)
Eu
tta1
eaten. xnviber
193
TYPES
01?
AJC
oJ Percentage
C
organism. this containing tcachs s ot nber
a B eaten. organism oX' type eath or Namber * A
16, DECEBB TO 193 23g B
SI RIODS,
FISH, OF
SFPT3
Tt
Vi')
T1LDU'LLRY EK, OR flJMON FROM SAL1ON
JTEN OROAN]W3 OF
ARRMT RIV2, TUIAMOOK
OF PERIOD
ID ACCOrn)ILo J)
OF CONTENTS STC1CII OF ANLY.3IS
COlIC)
COiTIiVED
DC 1E
TtBLE X
AN&LYSIS OF STOMACH CONTENTS Of? COHO SALMON FROM MUNSON CrLEK,. '1RIBtJV.RY OF TILIANOOK
4D MAJOR TYPE 0?
RIrR, ARMC2D ACCORDING O Tfl!E FERIODS, 8E OF FLS
PERIOD OF DECEBER 23, 1953 TO APRIL 7, 19514
G..NISL1S EMLEN.
A
C)
Length
interval
a
Percentage of total nunber eaten,
Niunber of each type of organian eaten, B
unber of touiacha containing tide organism.
-
.i
42 3
*
o
30-39
r1
69 A
B
C
L139
22 A
B
C
50-59
2A
B
C
60-69
779
0
-
inmm,
1.2A
0
g
0
333
555
32.7 514.5
2614
12
1.2
1414
14.3
8
18
38.1
139.8
1.5
22
18
6
28
3
1
68.3
73
2.14
3
7.3
2
1
3.
3.
159
141
21
B
61.14
C
12
8
Si A
329
79
15.8
B
136.5 U.2
C
147
22
14
-
60131310
202
g
0
8.1
9
61
3.14
11
17
6.6
9
86
8.6 12.1
30
32
5
14
14
0.5
3
0.13
0.13
3
0.6
3
1414
1
0.2
1
5
0.9
3
6
0.6
5
12
2.3
7
14
10
2
0.2
37
3.7
9
217
2
2
12
O,J
0.14
2.3
2
2
7
1
0.13
1.0
3
1
0.2
1
3.
1
1
1
2.14
2.14
2.14
2.14
2.14
2.14
1
1
1
1
1
1
14
3.
3
1
9
0.14
2
0.8
1
1.5
0.14
1.2
0.14
3.5
14
1
1
1
2
1
14
12
U
29
114
15
1
1.7
10
1.6
5
14.
0.6
3
214
3.13
9
5
0.7
5
14.1
2.0
6
9
6.14
28
0
530
702
0.14
3
BI
X
ANALYSIS OF STOMACh CONIENTS OF COHO SALMON PROM MUNSON CRK, TRIBUTARY OF
C0ITflVED
RIODS, S]E QF FISU, AND MAJC TYPES
TILIAM0OI RWEH, ARRAfl3ED ACCORDfl1G TO TThB
OF OHGANISL EkTEN. PERIOD OF DEC1BF11
, 1953 TO APRIL 7, 19514
Tiih' rif iv.h
rr.n1
t+
PcItaif nf tntai numbr
tit
1
Li
atflth1;n1.
,0
0
(3
-P
V
a
Q
r}
-
Length
0
interv1
o
o
S
0
.
43
04
01
4
(3
80-89
90-99
100-109
52k
2
92
22
2.9
8
3
B
55.5
96
12.6
1,0
O.i.
C
145
27
28
29
ih
7
3
A
171
16
i8
143
5
2
1423
B
C
140.3
3: A
19
57.5
B
C
236 A
B
C
14.5
5.1
3.
11
12.1 3.0
2
16614 ic8
216
6.014 12.].
81.3
3
1414.9
146
28.5
130
1
168
14.5
98
12.1
1.14
0.6
114
3
2
14.
12.].
3
1
0.3
.
3.0
1
53
1214
39
1.14
5
5
1
0.7
5
1
22
2
14
14
22
0.6
1.1
2
0,7
5
1
1,3.
14
0.8
21
14.5
6.2
1].
2
2
63
353
0.6 17.8
2
14
5
75
3
9.1
2
3.
28
12
760
1.6
314
0.1
1
3.0
1
307
8.3
13
1.7
8
18
0.5
59
1.6
17
114
33
iS
o.5
143
14
1.5
27
0.7
20
14.14
22
0.1
5
36914
2.0
6
TAELE XI
ANkL:SIS OF STOMACH CONTENTS OF COHO SALMON YOUNG FROM. AThERNETHY CREEK, TtJTA.RY 0?
W31IATE RrTR, ARPIIGED ACC(Dfl!G TO TThE PERIODS, SIEE OF FISH A M&JOR TYPES
LU31
OF ORGANISMS EtTEI'T. PERIOI) OF
19, 1952 TO MARCH 11, 1953
Percerxtae of total number eaten,
A
Ninber of each type of organism eaten. B
C .' Nanibor of
tornachs containing this rganism.
i
I
4
Lnth
g
iritern1
43
331 X1rn.
50-59
6o69
l.A
1
2
B
33
67
C
1
1
27 A
186
66
14.9
15.14.
217
U.li.
29
6.8
33
12
330
20
1.7
18
8?
B
C
70-79
80-89
90-99
73 A
143.1
1463
B
140.2
C
65
58 A
1408
28.6
39
207
B
147.8
2L2
C
514
37
114 A
11
C
86
331
27.7 142.1
12
13
3
10.2
a
145
114.5
8
149
6
8
1.9
3
3.5
18
12
1.0
10
16
i.h
10
514
20
o
6.3
20
18
5.8
8
8
2.3
13
14
1.3
3
7
0.1
5
5
1.6
3
7
50
1.6
U.
14.
28
2.14
7
12
13.2
3
0.7
3
3.
14
0.2
0.9
3.
1
aS
2.3
7
2
3.
0.2
0.1
2
3.
3
12
19
16
1.9
12
11
1.3
3
2
0.14
9
3
0.2
2
3
3.
1
1.0
0.3
1
0.3
1
6
1.9
3
3
0.14
3
114
2
81
3.3
.38
3.3
0.14
15
1.3
1
1428
0.2
1
n113
6
28
1
3.3
19
0.1
1
6
853
0.7
3
8
2
310
2.6
6
o.6
1
TABI
XI
COLrTIIUED - A 1LYW OF STOU&CH CO
NT> (I Ci1O SALLON IOUUG
OE AD NETi:Y c1U,
UGD tOOrt.E x
fl3UTtLiY C
iJAiLThL RIV à,
TtE I P1OI)Ø, IJ U FI$1I,
AN!) LI&JQR TPL OF ORGALIS1A$ ELTU.
IUD OF JVIL
19, 192 TO !11CH U, 1953
A
Number of each type of organLsr eaten. B * fercentage of total riumbr eaten.
C = Number of storiachs cortarining this oranian.
Length4
$
A
rl
111
IOG-1092A
9
B
liE.0
C
2
175 A
1353
B
C
ii..6
17
2
10.0
1
6
1
5.0 30.0
1
1
202
1I7
738
26.7
7.3
5.3
61
107
59
36
1.6
32
1,3
26
57
2.1
31
216
7.8
38
33
6
1.2 0.2
11
6
8
0.3
5
1
5.0
1
1
89
3.2
59
21
20
5.0
1
o.8
7
2757
0.2
10
0
OF 00110 SALMON YCUIP3 FRC AD NE7M! CREE1, 1II3UJff OF
T!kBLE XII AL3 IS OF STOMACH CON2EN
JOR 'rr?Es
WILIAMETTE RIVEI, AR&VJ) A000nDINO TO TDIE PFIODT, SIZE OF FISH AUD
OF ORGANISMS EATEN. PFIUO1) OF M CR 18, 1953 TO JUNE 10, 1953.
Percentage of total number eaten.
A * IMmber of each type of orgaatsm eaten. B
C * &mber of stomachs containing this organlmn.
111111
30-39
140.149
50-59
60-69
70-79
38 A
B
142.5
C
36
27 A
B
338
72.5
C
27
28 A
303
B
51.2
C
26
1 A
2511
B
1.18.8
C
18
13 A
'3
C
80-89
706
314 A
B
C
101
39.3
10
159
58.0
.25
9
0.5
B
17).
10.3
17
1
1
2
0.13.
7.
1.5
3
0.6
1
6
3
3
0.6
3
14
2
0.3
0.3
2
Q.3
25
5
3
9
1.5
8
2
113.1.1
9
1.5
2
2
2
1
21
14.7
7
2
hi.
1,1
3
1
257
14
22
8.0
16
207
39.8
16
0.8
1
5
1.8
5
109
112.11
8
113
15..?
113.
i6
3.1
6
7
2.7
5
10
3.6
6
0.7
3
13
.
0,8
9
1
7
14
11.
6
5
1.9
1
O,1
1.14
laS
2
1
1
2
2
0.7
5
ii.
1.5
14
1
2
0.7
2
3
1.1
3
Ii.
1363
14
1.8
ii.
589
520
14
.
1.1.0
23
1656
2
0.2
..
1
0.2
5.8
2.5
2.3
.
1
27
0.6
3
1.5
211
o.5, 12.7
6
5
2
9
0.5
u.14
9
3.5
15
521
0.9 31.Ii,
3
14
3
53
1
0.2
1
1
0.2
0.14
1
8
1
2
22
3
1
1.5
3
1
3
1,1
3
1
15
5.5
7
253
0.14
2714
.
TAJ3LE 111
ANLYSIS OF STOMACH CONNTS OF 00110 SAI2ON YOUNG FROM A]3ERNEThY CRE1c,
TRIBUTARY OF WIIJI.MET'1E RIVLR, ARRANGED ACCORDING TO TflJE PERIOi)S, SIZE OF FISH AND
MAJOR T!PES OF ORGANISMS EATEN. PERIOD OF MMiCH 18, 1953 To JUNE 10, 1953
CONTINUED
Percentage of total number eaten,
mber of each type of orgariarn eaten. W
C * }imber of stoinacha containing this organism.
A *
Length
nterval
I
I
90-99
ZLA
B
C
100-109 17 A
B
C
110-119
6 A
B
C
120-129
11111
I
1A
B
C
5611
2
t1.1
11
8.7
1.6
2
11.0
5
31
3
6.7
1
12
23
19.2 10.0
10
6
.8
12
3
19
52.8
6
2
5.6
2.
C
o.B
1
2
5.6
1
60.0
1.
148.6
1714
3
2
13
1
2
63
h
3.1
2.1k
1.6
10.2
0.8
i.6
6
2
2
1
1
1
2
1.7
2
1.7
2
1.7
2
2
2
8
6
16.7
14
3
2t6
6.1
57
15
0.14
13
722
17.8
105
1
1
9
7.1
3
1126
0.8
1
2
1
8
27
1.7
2
0.8
6.7
5
22.5
1
1
3
119
36
11.1
8.3
1
2
1
1
20.0
1
3
203 A 1970
B
7
1
5
20.0
1
71
1.8
140
214
0.6
18
51
1.3
39
20
0.5
16
556
1.5 13.7
59
22
1.3
10
0.2
6
211
52
5.2
1.3
31
S
314
0.8
8
140I1
ALYSIS OF ST0CH CONTENC3 OF 00110 SALLIQN !OUNG FROi AI3ERNETHT CREEK, TRIBU2RY OF
FRIODS, SIZE OF FISH AND M&JOR TYPES
)
WTLIA}AETTE RIVit,. ARRANGED ACCORDING
T&BLE XIII
OF ORQNISUS FMEN. PERIOD OF JUNE 16, 193 TO SEPTB:R 16, 193
A
inber of each type of organism eaten. B * Percentage of total miibez' eaten
C - Minber of stoinacha contcdning this organism.
Iezigth
inerval4
c:z
U
0
4
1A
60-69
70-79
80-89
B
1
O.O
C
1
76
26.0
2
1
G.7
C
19
1
03 7.!
1
9
22
b2
iZ,1
108
17
.8
20
B
26.9
C
27
1
13
27
lb.
36 A
100
22
23.5
8
1.9
5.2
89
20.9
26
6
9
27
58
13.6
22
27
17.h
2
1
0.6
1
3L.
30
bA
B
C
7
1.3
2
36
.38
93 17.6
21.9
10
37.0
22
19
I
0.3
B
C
90-99
2
1
0.D
1
A
B
32A 1OI
o
.2
19.14
7
12
l..i
10
22
93
21.l
.?
2310
1
1
03
03
1
1
6
29
7.
3
9
0.8
2.3 03
3
1
8
1.2
5
0.9
U
17
9
223
14,0
1912
55
35.5
7
10
3.b
2.6
9
292
1
386
1
2
0.1
2
3
1
1
1.9
3
0.6
0.6
1
1
]5
3.6
1
CONTINUED - ANALYSIS OF STOMACH GONNTS OF COHO SAlMON YOUR) FROM ABERNETHY CREEK,
IRIBUTARY OF WIIAT]E RIVER, ARRANGED ACCORDING TO TIME PIRIODb, SIZE OF FISH ANI)
MAJOR TYPES OF ORGANISMS EATEN. PERIOD OF JUNE 16, 193 PC> SEPTh;tE1ER 16, 193
TABLE XIII
A
!mh' nf
iith +r
n
rif
-
-- -- -
- a P --
nf tn+.iJ mimhr
tn -
C * Iinber o.t atozaachs containing this organi.
$
Length.
interva1
g
S
B
6
6
1
i06 A
B
C
31
i
2
b2.9
li2.9
C
cz
V
r4
*
100-109 2A
$
$
1
1
13
1
82
1
6.
33
2L6 1.0
8110
239
18.7
8b
1
3&3
9.8 27.7
2
723
36
b.2
2.8
10
8
0.6
30
6
23
1
3
1
0.2
3
2J
1
12Th
1.2
1
L1
WIIIIU!ETIE RIVER, ARRkNGED ACCORDING 1D T
PRI0DS, SIZE OF FISH AND IJOR T!PES
TEN. PERIOD OF SEP1BT1R 23, 1953 TO DECE133ER 9, 1953
OF O1PNISLS
Percentage of total rEmber eaten.:
A * imber of each type of organism eaten. B
this
organism.
Bzrnber
of
stomachs
containisg
C
*
*
Length
*
U
B
C
80-39
90-99
16A
1!
18.2
1
18.2
2
2
61
2
36.14
B
C
a6.S
5
19.6
1.0
10
2
30 A
15
38
16.2
8
13
C
100-1092A
B
O
U0-1191A
B
C
Si A
19.3.
2011
50.0
1
112
B
22.9
0
33
3.14
14
3
143
3
U
14.7
7
13
5.7
8
18
7.7
12
1
1
1
16.7
1
3
0.9
9.1
1
16.7
16.7
1
1
1
16.7
1
86
17.6
214
65
28.3
9.1
91
1
1
26
11.3
12
5.2
9
II
32
liB
13.6
17
20.14
114
1
16.7
1
35
3.1
911
1
0.9
0.14
8
2
1
27
1
1
11.5
0.14
o.14
114
1
1
2
0.8
2
230
1
0.14
1
2
0.8
2
1
0,14
1
6
1
16.7
1
6
3.
16.7
1
36.7
1
31
2
1
16.7
1
1.
35
I
32
6.6
99
203
35.14
21.
28
26
'15
142
8.6
Z
3
0.6
3
1
0.2
1
14
1
2
0.8
0.2
o.14
141
2
0.2
1
1
1
0.9
0.9
3.
1
1
1.2
1
3
13.9
16
1
35.8
33
1
0.9
1
1
1.2
1
2
3.5
13
3
6.1
7
1
2
10.0
2a6
3
0.9
1
2
1
2
6.9
8
2
2.6
3
1
2.b
2
1
0.9
1
7.7
1
1
1.2
1
2.1k
1
2
2
1
10.0
1
7.7
38.5
5
1
1.2
1
1
1
1
7.7
33
1
82
20
3.
1
3.7
3
3
6
60.0
69
5
2
15.o
25.0
9
5
2
2
38.5
2
2
67.0
55
3.7
1
2
10.0
u
C
B
12A
C
B
100-10931
C
B
A6
90-99
C
B
80-8931
inmm.
9
nterva1
2
g
j
eaten ]mB)er total of Percentage
orgardem. thL contanlng ataathn of
each of
eaten, orgauian of pe
B
E&L
Nuner
C
inber * A
R(kNISMS OF
19513 24, & 17, 35, FEBRUMIY OF PUDD
PIODS, Ti1 TO A000RDIU3 AREAliGED RIVJ,
TYPES MILJOR AND FISH OF
OF I!UBUT&RY CItEK, ABEENIY FROLC YOUIL SkION COlIC) OF COTES STO2CH OF
SE
W1ilT
ALSIS
XV TABLE
TABI
XTI
ANAL'!SIS OF STOMACH CON1EIrS OF COHO SA1JON FROM CEDtR CREEK,
3UTARY OF SANDY RIVER,
ARRMGLD ACCORDItiG TO TLiE iFRIODS, SL3E OF FISH AND MAJOW T3PES OF ORGkNISIIS EATEN.
PERIOD OF iCER 10, 192 TO MARCH 10, 193
A
Number at each type ot organian eaten. B
C * Nuniber at atouach
Percentage at total number eaten,
containing tbi organizin..
Lungth4-4
iziterva1
in.
r4
9
o49
IA
h!
2
2
92.0
1
14.0
14.0
1
1
114
22
B
C
60-69
19 A
2146
B
80-89
28 A
S
C
2!
C
hA
13
1140
69.14
B
90-99
18
B
20A
614
2.0 U.
C
70-79
r4
2
1453
C!.5
1?
17.
2.9
14.6
11.
ll
13
1.6
32
14.0
a
149
14
1
2
1
2
6
1.1
5
6
1.1
22
2
14
8
3
0.7
3
7
91.6
0.7
1.7
C
11
2
2
14
0.14
1
1014
22,0
0.2
3J4
14.1
1
0.8
2
8
B
3714
2
1
16
1
14
9
26
214
3
2
2
0.14
0.2
3
2
0.2
1
1
0.2
1
1
3.2
1
1473
3.14
1
800
3,0
2
II
14
141
1
0.8
3
7,6
13
0,2
20
1
1
14.9
1
9
36
1
1409
Length
*
I
-
F
&nterva].
100*109
2 A
B
c
11O-U9 2L
9
75.0
2
6SJ
C
2
83A
l7cxL
C
2
19
B
B
2
i6.6
1
8.3
1
3
13.8
2
219
73.9
9.5
76
39
12
103
2
12
1.8
29
1
341
1
2
69
1
87
3.8
8
0.3
2
39
5
2
3
3
29
4
4
]31
3
5.8
9
101
1
2 2308
1
2
.4.8
42
ANAJJYSIS OF STOMACH 0ONTEThS OF 00110 S&IL0N Y1OM CEflA.R CREEK, LRIBTJRY OF S&NDY RIVER,
ARRMGED ACC0RDflK TO TINE PERIODS, SIZE OF FISH AND M&LJOR TYPES OF ORGANL3 E1TEN,
PERIOD OF MARCH 18, 1953 TO JUNE 10, 1953
Percentage o total 2mznbez, eaten,
1unber ot each type o.t' organisu eaten.
4
O a Nwnbez o stomachs cotainizg this organism,
I.
Lexigth
a
.nterval
30-39
6J
392
1
3
1
83.0
2.1
6.14
2.1
2.1
i
1.
1
1
14.3
C
60-69
118
14A
82.Ii
C
70-79
ii.
17 A
3
2
2.1
1.1
2
2
8
17
3
2.1
1
1
1
0.7
II
0.7
2
14
8
2.0
71.0 8.8
2.0
14.3
0.5
C
17
9
7
9
1
2
iSA
200
16
7
39
23 12.6
7
2.3
7
6
13
5
11411
2
1
9.5
14.7
1
1
65.0 5.2
C
90-99
3
1.0
I
80-89
282
9
6.3
3
3A
114
66.8 19.0
C
2
2
2
2
2
i.I.
1.14
1.1,.
I
I
1
16
61
0.3
14.0
2
13
3.3
5
U
1147
11j3
397
2.8
7
6
2
5
9
14
0.6
2.9
1.3
b8
1.9
2
1.6
3
2
3
S
310
21
ANALYSIS OF STOMACH CONTENTS OF COHO SAI21ON ROM CEIR CREEK, TRThU1RY OF
PERIODS, SIZE OF FISH AND LMOR flPE OF
TO
SANDY RIVLR, ARRui3E1) ACCOEDI1
ORGkNISNS ETEN. PERIOD OF NARCH 18, 19S3 TO JtJX 10 193
CONTINt.TED
C
Nimber ci' atcacha containisg this organism.
organism eaten, B
tii,fiiiii
11
nrzt.
p
2
3
(
1L7
Percentage of total nunber eaten.
Nwnber of eai tpe
Length
interval
1OG1O9
of
A
ffi
3
C
ho
3.
91
h.
2
693
72.0
U
66
6.9
22
1
1
1
2].
61
13
1.3
8
2.2
17
6.3
27
S
.
1
1
3
0.3
3
33
1.3
7
17
1.8
8
0.8
10
h
18
1.9
3
26
2.9
i!
20
2.1
1
1
0.1
1
962
FROM CEDAR CREEP, TRIJRY OF S&NDY
RIVER, ARRANGED ACCORDING TO T11E PERIODS, SLE OF FISH AND ThtJOR .TES OF 0ROANMS
ALYSI5 OF STOMACH CONNTS OF COW)
TPBLE XVIII
PERIOD OF JUNE 19, 3.9S3 1) SEPTEMBTt 16, i9f3
EATEN.
A
C
'OU
Percentage of total number eaten.
&tbr of each type o± organism eaten. B
mber of ataiachs containing this organism.
Length
intervaLQ.
3O-39
130-249
hA )O
B
C
?o.S
10 A
116
66.1
10
B
C
6 A
B
C
60-69
70-79
g
29.
24
.13
29
16.6
7
1
2
13.0
0.6
1.1
2.9
0.6
1
2
2
1
1
2
3
0.7
1
i.13
2.
2
2
3
6.
2
3.
24
117
79.5
13
18
2.7 12.2
2
!
6
A
36
3
1
1
B
C
76,7
6.13
2.1
2.1
2
1
1
8A
B
C
268
8138
8
213
63
Ii
0.3 33.0
1
3
1
3.
10
3
.7 1.7
3
2
1
1
17
0.6
1
1247
2
1
1
2.1
2.1
2.1
1
1
1
247
6
1.9
2
316
AN&LYSIS OF STOMACH qONN$ OF COHO $AU1ON YOUW} FROM CEDAR CREEK, ¶IRJBJT&RY
CONTINUED
OF SA.NDY aIVER, ARRANGED ACCORDWG ID TflE PERIODS, SIZE OF FISH, AND MAJOR TYPES OF
ORGANISMS EATEN. PERIODOF JUNE 19, 193 TO SEPTLER 16, 193
TABLE XVIII
Percentage of total number eaten.
A a Iimber of each type of organia eaten. B
o - .unber of stiachs conta3.ning this orgaz2ism.
iiiterva1
8089
7A
B
O
90-99
3A
7
61.0
7
142.9
C
2
143 A
737
7.0
142
26
2.6
2
1
1
7.8
1.3
1.3
3
1
1
2
246
2
1
3
1.3
3,9
2
3.
1
3
B
B
C
7
9.1
2
3II
3.9
2
3
77
7
142.9
1
3l
3
3
1L3
10
1.0
14.
5,2
1
136
13.8
141121
6
0.6
5
6
0.6
6
ii
1,1
7
3
0.3
214
3
10
2.14
3
0.3
1
14
14
0.14
0.14
2
14
982
TABLE XIX
Th1JTM1.Y OF SANDY
AN&LYSIS OF STOWCH CONTEWLS OF COW) SMI(ON YOUNG FROM CEDAR CREEK,
FISH
AND
W
JQR
TYPES
OF ORGANISMS
SIZE
OF
RIVER, ARRANGED ACCORDING TO TIME PERIODS
EATEN. PERIOD OF SEPi]3ER 23, 1953 TO LCEIABER 16, 1953
A
!rnber o1 each type o organism eaten. B * Percentage of total number eaten.
Thimber of stomachs con aiug this organi,
C
94
H
Sca..59
B A
B
C
60-69
7C-?9
8
U
330
60.5
C
33
114A
3 A
B
C
80-89
106
i2.6
9A
23
29.0
3
.
2.3
3
30
5.5
8
2
14.14
1
1.7k
8
1
3
3.52
S
2
0.14
2.0
0,8
1
3
1
i
10
o.4
2
19
1
1
14
142..2
2.2
2.2
8.9
1
1
5
11.1
1
3
2
14
.9
C
7
314 A
1478
B
514.i
C
31
55
6.2
12
16
27.8
0.7
14
3
36
Z2
14.1
13
26.5
22
14
S
0.5
3
0.6
3
1
2
2
14.14
14.14
2
2
1
7
0.8
5
6
14
0.7
5
2148
14
1
3
0.6
2
14
17
6.8
1.14
6
29
77
6.8 31.0
6
14
I
51a
2.9
8
145
2
O.
2
1
0.1
1
3?
14.2
885
RIVER
14
114.2
.3
7.9
5
63
1
26.6
25
14
2
12.2
31
Ii
1.
5.
17
1
1
1
1
1
1.6
1.6
1
5
25.9
10
1
6.7
13.3
1
1
9.1
3
2
1
3.2
1
1
3.2
1
21
1.6
1
17.14
6
5
6
C
B
6A
1
146.6
7
1
16.1
353
Z3J
39.6
11
1
6.7
1
3
12.9
14
1
1
1
5.9
1
14
L2.O
13
1
v.14
5
C
B
iL
100-109
C
B
14
70-79
C
B
6a.691A
interval41
o
$
Langth..
organism, this containing 3toaacba ',f 1bmber * C
eaten. number total of Percentage * B eaten. organism of type each of !mber * A
SANflZ
19IL 17, FEERUARY TO 1953 31, tECEMBER OF PflRIOD E?TEN,
ACCORDI ARAJflE1)
0RQkNISL OF TYPES MAJOR MID FISH OF SIZE PERIODS, TB5E TO
YOUNG SAWON COHO OF CONTEITS STOMACH 01? ANA.LIS
OF RJ.BUTARY CRE, G)flR .OL
XX TABLE
!mBIE UI
MIDDlE FORK OF 'mE WaAT
ANALYSTS (i STOMACH CONTENTS OF Y(JNG ounroox SAUON FROM 'I
RIVER, LR.R&NGED ACCORDING 'ID TD.
PERIODS, SIZE OF FISH A}) MAJOR TYPES OF ORG&NIS
E&iN. WRIOI) OF NCVE}3ER 26 1952 70 MARCH 4, 1953
B * Percentage of total wmber eaten.
A
irnber of each type of organisni eaten.
4'
C
miber of stuaoha containing thi
ogan.tarn,
43
B
inteal
70-79
8A
B
80-89
100-109
C
A
a
4.4
5
3.5
10].
8
27
390
5.?
13
12
22 A
21
1i.
82.8
18
111
B
11..?
C
9
'7
12
25 A
26
8
],56
11.13
3.5
6
C
U
6
7 A
B
C
87 A
B
0
7.8
14.8
1
22.2
3
100
9,6
3
60
5.7
32
61..?
68.4
6
j
7
71.6
4
C
B
110-119
28
19.9
S
B
90-99
}
j
5.0
'4
1
0.2
1
5
1.1
4
6
3.3
5
2
4.9
2
9
1
20
3.9
0.6
11.1
7
1
7
2
0.9
1
o.4
33
14.5
1
10
2
2
1
7.13
7.13
3,7
2
1
1
15
760
72.6 1.4
11
46
23
0.8
7
12
0.9
4
9
0.9
9
1
3.7
1
11
40,7
94
9.0
33
2
0.2
2
13
1
0.2
0.13
0.1
2
2
2
1
IL71
180
228
27
3
1047
-a
WILIIE
F STOMACH CONNT3 Of IOUM CHINOOK SALMON
TABLE XXII AN&L
TF
MiDDLE FQR OF
PERIOD$, SIZE OF FLSH AND UA.JQR TYPES OF ORkHISLE
EA11N. PERIOD OF MARCH 10, 3.953 TO JUNE U 1953
RIVER, ARRLNGED AOCORi)Th) TO T]
A.
ii1ber oZ each type or organi8m eaten, B
C
mber or atoc3w containg this organism.
Percentage or total wiuber eaten.
4.
Length
terva14a
nrm.
u
g
,
.
IL
I
100. &
2
121L
82.1
U
I
ilL
B
C
rI
U A
B
C
1
0.8
1
31
72.5
7
S
9
Z .0
3
3.
3.6
1
8
22.2
I
0.8
9
1
L
3
2.6
2.6
I
i
2
z.o
i6
10.6
3.141
61
50.0 3.6
13
1
36.1
2.8
3
1
S
3.3
IL
I
3.6
1
0.8
1
3
0.2
.3
2
5.1
1
10.3
2
1
3.6
I
3
10.7
3
28'
5
13.9
36
14
3
39
V.BLE XXII
aON'flNUED
CliINCOK SAWON FRW THE Mfl)DLE FORK OF THE
ANALYSIS OF STOMACH CONTENTS OF YOJ
RIVER, ARRMI3ED ACCORDING TO T 1ME PERIODS, SIZE OF FISH 1W) MAJOR TTES OF
CQANISM8 E&TEN. PERIOD OF PRCH 10, 1953 TO JUNE 11, 1953
TILIAT
Percentage of total number eaten.
A * Nuiber o each type ot organism eaten. B
C * flumber of 8toath8 contalnisg this organism.
g
I2ngth
istervale
4
3
0
O..99
9A
B
C
100-1093k
B
C
1
6..?
1
t)
2
33.3
2
26.7
3.
14
5()Ø
1
.0
63.14
iS
2
3
75.0
2
33
14
1
1
177
3
20.0
1
1
0
C
333
1
50.0
B
B
5
14
1
UG-U9 IA
5]. A
9
148
14
14.7
17.2
1.14
9
28
14
i.14
5
1.8
3
1
6
2.1
5
22
7.9
15
279
TAB1
XXIII ANALYSIS UI? STOCH CONNTS OF YOU1 CHINOOK SA1LON FROM THE iIWIJIE FC1K (P THE WILIAMETTE
RIVLR, AHRAiGED ACCORDThG TO TIME PEaIUDS, SIhE OF FISH AtD JJUR TYPES OF 0RQA.NISL
E1TEL
PERIOD 01
HE
, 193 TO EP1.k3ER 17,. 193
A.
C
length
0
-
140-1491k
B
C.
50-59
70
147.9
C
8
7 A
108
.14
3 A
U.
B
C
U
15.6
214.14
1
.
1
0.?
8
5.5
1.14
3.
14
1
7
52
1
10
23.14
0.11
14.5
1
ii.
2
5
15
30.6
22.14
3
2
:i.
118.6
C
I
114.3
55.6
9 A
B
80-89
85.7
1
3
I
'
6
C
B
70-79
$
3k
B
60-69
B * Percentage of total. mimber eaten,
Zzaber of each type of organin eaten
Niraber of stomachs containing thin organiem.
2
1
1
2.0
1
16
10.9
3
5
141
3,14
28.1
5
14
3
2.0
2
51
23.0
222
S
2
1
17
2
14.1
2.0
314.7
14.1
1
3.
2
2
149
TABLE XXIII CONTINUED
TO
A
ANPLYSIS OF STOMACH CONZTS OF YO1JI3 CHINOOK SAWON FROI THE MIDDLE FC
0?
RIVER, ARRANGED ACCORDING TO TIME PIODS, SIZE OF FISH AND MAJOR TPS
OF ORGANISMS
PLIOD CF JU
, 1953 TO SEP
17, 1953
Percentage of tote]. number eaten,
pe of ozganiam eaten. B
miber of stoiaeh containing this organism.
}ktmber of ea4h
C
Length
interval
90-99
100-109
I
$
13
13
A
313
B
C
68.0
A
28
27.?
B
C
110-119
1A
B
C
120-1291A
B
C
13
1
2.0
1
2
2
2
1
1
13.0
).O
2.0
2.0
3
6.0
2
1
2
1
1
2
2
18
22.0
1
2
1.7
2
I
1
293
O
29
1313.5
6
1
0.8
106
5,0
3
1
10
52.6
I
12
1.8
3
19
2
10.5
5.3
I
1
6
0.9
32
20.1
18
5
10
335
So
8.0
2
13
61,3
33 A
B
13
8
5
38.
6
31.6
I
$
13,0
132.5
13
C,
32
13.8 13.8
'5
6
1.
Q9
18.13
6
15
16
2.13
10
13
0,6
2
OF
iE WILLA.L1ET
ThE MIDDI2 FOI
TABLE UIV ANkLYSIS OF 5TJMACIi CCWrENTS QF YOiJi CHu1OOK AILION
TYPES
OF
OR.1L1S
IUYER, ARR&NGEI) A000EwIm ZO TLiE PERIODS, SIZE OF Fi3II, AVID UJQR
PERIOD OF N(NEMBER 5, 1953 TO 10 SNEER IS, 1953
FATEH
Percentage o total nwber eaten.
iach type o.t QI'ganiSn eaten, B
iii.ber o
A
Number o1 atonacha cozitainthg this rganisiu,
C
i
0
Q
interva1
1O0-1O
11GU9
12-129
.
2 A
15.14
C
2
3A
21
B
60.0
C
2
2
1
1
1
1.7
7,7
1
1
Sb
2
2
8 A
53
5
7
51.0
).8
2
6.6
5
B
C
7
3
2
15.1k
1
5
38.5
1
1
1
7.7
7.?
1
1
1
14
7
13
35
10.0
30.0
2
3
30
53.6
M
q
.
C
B
43
0
g
0
2
3.6
3 A
4
q
0
g
2
B
41
P.
p.
0
q
1*
1
3
2
2
1
1.8
1
1
3.9
5.8
2
1.8
1
6
3.9
3
3
5
8.9
3
6
5.8
14
U
56
19.6
ii.
19
18.3
7
1014
ANkLYIS OF STOMACH COflTET5 c YOU0 CHINCOK SAiCH FROM tE 'L)DIE O1tK (IF Th WIL1T
A ND
JC
TO TINE WFIO'DS, SIZE OF
T7PS OF CEQ&NMS
1L.!OD ACCORDfl
RIVE1t,
TO FEBRUARY 19, 1914
EPTEN. PERIOD OF JANUflRY 19, 19
TABL1 XXV
C
Percentage of total number eaten.
* Number of each tvp ot organian' eaten. B
Najuber of stotacs containing this organien'.
$
Length
uterra1
iuxrn
g
2
.
1
30.39
B
90-99
100-109
C
2
IA
1
B
12.5
C
1
2 A
B
C
110-119
7.0
303
90.2
2
1
1,5
1
]5
22.0
2
1
68
1
6
8
7L0
l2.
1
1
0.3
1
30
8.9
1
1
1
1
0.3
0.3
1
1
IA
7
336
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C
6i
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C
1
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5
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2
51
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115
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01
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01
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01
01
01
01
01
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9t/t
6/I
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01
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05
05
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115
115
59
OS
9
69
99
99
XV
911
/tt
9t
511
91/U
It/U
11/It
9/Ot
TZ/Ot
t'
0
9C
IC
111/01
1/ot
OC/6
91/6
6/6
SC
CC
IC
61/9
t/9
c/cl
C6t
X*I
°
0
ts-r
rji
-
i:mo Norn
o
1
o
im itivt
TEBi$ ThVI
Sample
It,e
No. of Fish
1
0
10
9
8
8
10
10
10
WNSCN Cff1K
Thus
of Ly
iLIifl iJY = CoNTINUED
Texnperatu.res
Water
Air
2itidity
Weather
Flow
70
30
19514
2/23
3/3
60
61
3/10
3/17
62
63
31,23
614
3/31
65
66
14/7
10
10
10
10
10
10
147
8
2
CIou4
11430
1414
55
3.
0930
0815
1515
142
140
Clear
Snow
ih
lii
140
2
2
1
56
148
10Z
143
146
0920
15
ItS
2
2
68
11am
20
C1ou
Rain
114
Clonc
12
52
N)
12
5
15
15
3
3
15
3
3
3
5
20
20
2
2
5
.3
Shavers
1
Clear
Rain
Cloudy
Overcast
cloudy Partly
Rain
Clear
cloudy Partly
cleudy Partly
Clear
Rain
Rain
Rain
Clear
Showers
Cloudy
S
3
Clear
Rain
Clear
Rain
Showers
Overcast
Overcast
Overcast
S
12
5
18
6
8
14
60
62
56
L8
514
148
So
14
Si
50
50
50
52
52
514
1
3.
3
2.
1
1
1
58
61
1414
147
143
148
147
56
0900
0900
1000
0930
1000
0920
0930
0900
1000
1000
1000
1000
1300
27
26
8
28
10
10
6
5
10
10
10
10
9.
10
3
5
10
10
10
29
214
23
147
147
3
142
33
1
1
145
147
3
114
10
15
So
iS
II
50
714
1
10
14?
50
1
9
10
15
146
147
147
1
3
3
146
147
148
147
11420
1000
1000
1000
1030
1030
1200
11
145
57
1030
147
143
L7
52
3
10
9
3
5
7
10
10
6/2.0
6/3
5/27
5/20
5/13
5/6
14/29
22
a
20
19
18
17
146
145
2.
2
1
1
147
1414
.16
13
12
1/iS
14/8
hA
3/214
3/18
3/U
3/7
2/214
2/18
2/U
1/28
10
2/14
II
9
8
i/a
1/114
7
1953
25
18
3
1
cloucty
ParUy
Overcast
Rain
Clear
F1cw
Weather
36
Zi.2
1
145
50
1
1
1
3
1
uiditr
148
Ar
147
Water
Temperatures
9
9
10
S
10
10
0930
0930
1030
1300
Day oi'
Time
0
1
Fish o1 No.
6
5
14
3
2
12/31
12/214
12/17
12t10
12/3
1
No.
1952
Date
Saanple
TABI mu IESOtJ CREEK SkTLflfl DAC - CONTflUED
Date
$ampl.
No.
No, of Fish
0
1
Time
of Day
lèrnperatures
Water
Air
Turbiditr
oather
Flow
193
6717
30
6/214
31
7
7/8
7/15
32
10
10
11
33
9
7/22
7/29
8/5
8/12
8/19
8/26
9/2
9/9
9/16
9/23
9/30
10/7
35
36
37
38
39
10
10
10
10
10
10
10
10
10
10
10
10
142
143
1414
145
146
10/114
)?
10/23.
148
10/28
149
u/il
50
51
52
7
9
7
514
1240
55
56
10
57
58
8
7
12/16
12/23
12/31
58
62
61
60
63
67
65
614
57
61
1
1
1
Clear
Clear
7
3
C1e'
14
1
1
1
Clear
Partly ci
1
0vercat
25
2
1
514
57
2
149
1
09145
50
Si
3.030
147
149
1Q15
Si
59
1
2
1
149
146
14
53
Si
L9
57
53
3
Part3.y cloudy
30
75
140
3
Rain
Pzttiy cloudy
50
51
1
0vercat
148
14.3
143
35
1
1
Rain
Clear
0930
0930
1000
1000
1030
0915
10
12/2
6
56
Clear
Dr12z13
Clear
Clear
3v'rcast
Clear
Clear
Fog
Clear
Rain
Clear
Clear
Clear
Fog
Cloudy
cloudy
Part
Stor
1000
1000
0900
1500
10
lio
53
L
10
10
10
10
10
314
09l
l0l
0915
1000
0850
1030
0830
1130
1000
0915
61
60
1
1
76
60
61
63
71
71
61
71
60
69
57
63
56
57
57
62
1
1
58
14
614.
1
514
1
14
1
1
14
1
I
0.75
3.5
1
0,75
1
1.
2
I
2.5
6
3 a5
2
9
60
12
30
20
'-
TAJ)12 XXVII
a
No. oi Fish
1
Date
0
lARSON CREEK CAMPLII
Tiiae
oZ Day
DA.T& - CONTUUED
Teapez'aturs
Water
Air
Thrbidity
Weather
Flaw
19Th.
S
2/2
0900
0930
0930
7
240
1C)
2/17
7
0*
5
2
1
3
S
2
8
2/21k
S
3/10
3/17
0910
1000
1000
9
10
10
S
1/13
1/26
1/29
3515
1
1
1
30
1
liB
I
Clear
Clear
Cicar
Gvercast
L7
50
3
flain
50
53
1
b2
51
b6
2
3
1
0915
0vercast
L6
30
56
15
ll
ba
2
1
c!uercast
20
15
16
75
16
6
35
?arty cloudy lb
6
60
Clear
Hail
Clear
10
BI
Sample
Date
1952
12/10
No,
12,'17
12/21i
2
3
12/31
1953
1/7
i/i1
1/21
1/28
2/14
2/10
2/17
2/26
3/h
3/10
348
14/8
14/iS
b/a
5/i.
5/6
5/12
5/20
5/2?
6/3
64o
3.
No, of Fi5h
1
0
0CVIII
3ALING flT:.
CET)R 0T:
Thne
ibperaturen
Air
of Day
1iator
¶&mrbidity
10
1715
1i2
3
9
1200
38
38
2
10
10
140
5
6
8
140
142
7
142
148
7
6
16
146
8
9
10
7
142
).3
6
6*
6
11
147
143
146
143
146
2
2
2
2
1414
50
1
14
11
12
14
33
13
aS
16
14*
14
1414
17
18
19
5
13
14
1i
20
21
22
146
53
146
So
1
I
2
2*
143
143
14
1*
1330
1320
14.
Li
3
214.
14
1
No Fib
7/8
30
2
2
2
1*
5
26
27
28
29
2
14
23
6/19
6/23
7/2
2
2
1
56
1
147
52
1
146
146
2
514
2
Rain
overcaet
Overcast
Rain
Cloudy
Clear
Cloudy
RaIn
Cloudy
Clear
Rain
Cloudy
Clear
Clear
59
52
52
51i.
58
65
ihoo
140
142
614
1
70
So
60
80
514
11400
75
Cloudy
lliOO
2
35
55
100
8o
100
C1mdy
149
14
145
2
1330
3
20
30
2
55
1330
1330
3330
Rain
Rain
Cloudy
Rain
Cloudy
Cloudy
Rain
Cloudy
Clear
35
140
i1&00
12145
3
2
0verca.t
Clear
Clear
Cloudy
Flow
iain
65
72
53
58
1
Weather
148
68
614
.75
85
2
3
14
2
3
2
2
2
2
140
140
145
140
35
55
70
55
65
So
11.0
16
35
"JYIBL
Sep1e.
Date
No.
}b.
XXVIII
o flab
CEDAR CREEK SALiiLflG DATA.
Time
COITINUED
1brnperatures
1
0
o Day
Water
Air
Tirbidity
Weather
Flow
2
3
2
2
1330
1300
61
57
60
68
20
20
1
1h15
63
65
63
78
58
60
65
70
67
60
57
2
2
2
2
2
2
3
2
1:3
77
7/22
7/29
8/5
31
32
33
8/12
8/19
8/aS
9/2
35
36
37
3
39
9/8
9/16
9/23
3It
ItO
1
1
1
3
1
1
2
2
2
2
2
2
3
li].
3
9/30
10/7
3
3
10/1)4
10/21
10/28
U/It
u/U
11/18
uI
12/1
16
12/23
12/31
1)4)45
2
1
146
1)400
1330
1300
3330
ihoo
1)400
0835
1315
1300
1)400
I & 1*
1330
3
66
50
h6
It
)48
55
3
Clear
Cloudy
Clear
Clear
Clear
Clear
RaIn
Clear
Cloudy
Cloudy
Cloudy
RaiD
Clear
Cloudy
Clear
Clear
ItS
51
2
0rrcaet
11
It8
2
C1er
lIi.
Clcudy
Cloudy
Overcast
So
overcast
li
60
57
55
53
52
52
67
70
80
77
It9
1.
2
1)400
1)415
2
3
1
U00
It8
1)400
uS
149
)48
2
2
2
2
2
2
50
51
3
3
15oo
1300
It?
149
52
it
1)400
16
lj.8
3
3
3
2
53
NoFiab
5)4
2
1300
142
1t2
2
*Hatiy liborat ions
Rtn
20
20
15
ho
15
S
15
U
U
1)4
12
38
lit
26
So
30
-
p-
0 I3
'0
0'
-3
0)
Vt
VtVt O Vi.
0%
r6E
0
I,3p-.
'003
H
o
I
I
p
z
F
e
0
p4
3
tr
'0 N co O 0 r-j
,Jiflfl rrk
o
.4
,0
o
0
ttzt
4
r4
i14\'0 t
O
0
C4
Uh2Ih ii
Ch 0 r4 C'4 t'
000
TABLE XXX
Date
1952
Swaple
No.
11/
1
12/10
12/18
1953
2
3
T77
14
1/8
1/1)4
1/28
243
2/25
3/14
S
6
7
8
9
10
U
3/214
MLrnLE UIJJTTE AL:PLI
12
4)I
¶Lmperatures
1\irbidity
314
28
U
141
145
2
3
142
1414
2
S
142
148
2
liE
65
10
1414
149
li3
148
142
514
10
S
10
10
10
10
10
10
0
Later
lii
141
143
142
1414
13
14
SI?
'14
I
5/1)4
6/Z
15
16
17
18
'9
7/2
7/9
7/16
20
21
22
7/23
23
3
1
8/20
214
1.
26
27
28
29
9
2
5/28
(CHINoOK)
Air
W2
5/21
rit
1
No 11sh
53
3
5)4
50
58
3
2
149
59
Ii
147
61
6?
69
3
63
75
75
78
75
I
1
1
1
I
I
6)4
70
2
(55
8
70
1
58
62
1000
1000
1130
60
51
55
1114
514
3
52
52
3
2
2
3
3
2
2
3
65
67
weather
Clear
Rain
Overcast
Rain
Rain
Overcast
Cloudy
Clear
Clear
Cloudy
Rain
Rain
Rain
Rain
Rain
Rain
Cloudy
Clear
Clear
Cloudy
Clear
Clear
Clear
C1oud
9/3
9/10
947
10/28
1030
62
52
57
146
58
1
0
1
Clear
Clear
Clear
C1audy
TZBL
Date
Sample
No.
MIDDLE WIL.MET
XXX
No. of Fish
1
1142
1148
30
31
5
12/]6
12/31
1914
1/10
1/19
32
No fish
No fish
2/2
2/10
2/19
2/2
33
iLI
Tirae
0
of Day
1
1100
1100
314
35
36
37
38
39
140
1030
2
No fish
1
2
ofish
n
(CHINOoK)
CONTINUED
Teuiper'atuos
Water
ilr
149
58
145
147
1414
614
142
Turbidity
2
3
3
Overcast
Iii
52
14
flain.
L3
I3
Lió
18
2
2
56
2
Clear
Overcast
Cloudy
1414
TM3LE XXXI
Sanp10
Nc>.
1
76
1
3/U
2
3
6
6
6
6
6
6
Date
1953
3/18
3/26
14/1
14/7
14/iS
14/27
5/11
5/26
6/8
6/22
7/7
7/20
8/3
8/18
8/31
9/114.
9/28
10/12
10/26
11/9
11/30
14
5
6
COOS RIVER HTC1-fliRY SALPLIW ]T1L
of Fish
0
Ti
of Day
znpez'aturen
Water
148
Air
56
So
6
6
6
6
6
7
8
9
12
10
Ii
12
12
1414
Clear
Overcast
146
147
52
So
Si
52
58
56
56
62
62
12
12
12
13
U
1000
114
12
0930
15
16
1?
18
19
20
12
12
1000
12
12
9
ZI.
12
12
22
12
1100
1100
1000
1100
'2
58
65
70
70
59
69
67
72
60
52
60
52
149
55
So
1j3
51
53
1413
146
Rain
Clear
Clear
Rain
Clear
Overcast
Clear
Cloudy
Clear
23
12
12/114
214
1.
12/30
25
12
11130
143
26
27
28
29
12
12
1000
143
314
l
35
Overcast
12
12
12
0930
0915
15
142
142
C1er
09145
149
55
1330
Clear
19514
2fl3
2/Z3
3/8
30