OREGON DEPARTMENT
OF
[i1
FISH AND WILDLIFE
-a..
BAY CLAM
DATA SERIES REPORT
1987
*
4.
1987 BAY CLAM
CLAN DATA SERIES REPORT
by
Thomas F.
F. Gaumer
wildlife
Oregon Department of Fish and Wildlife
Marine Region
Newport,
Newport, oregon
Oregon
1990
April 1990
CONTENTS
CONTENTS
Page
Page
INTRODUCTION
INTRODUCTiON ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
............................................................... 1
1
RECREATIONAL
RECREATIONAL CLAM
CLAM FISHERY
FISHERY •••••••••••••••••••••••••••••••••••••••••••••••••
................................................. 11
COMMERCIAL
COMMERCIAL CLAM
CLAM HARVEST
HARVEST •••••••••••••••••••••••••••••••••••••••••••••••••••
................................................... 4
4
SPECIAL
SPECIAL STUDIES
STUDIES ........................................................... 5
5
Hatchery
Stock Enhancement
Enhancement •••••••••••••••••••••••••••••••••••••••••••
HatcheryStock
........................................... 55
Tillamook Bay •••••••••••••••.•••••••••••••••••••••••••••••.•••••••
5
TillamookBay
..................................................... 5
Yaquina
Bay ....................................................... 66
YaquinaBay
Coos Bay .......................................................... 77
CoosBay
Natural
Natural Recruitment
Recruitment Studies
Studies .......................................... 7
7
Yaquina Bay ....................................................... 77
YaquinaBay
0
0
Netarts
Bay ....................................................... 77
NetartsBay
SIGN REPLACEMENT...........................................................
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••88
SIGNREPLACEMENT
ACKNOWLEDGMENTS ...........................................................
••••••••••••••••••••••••••••••••••.•••••••••••••••••••••••• 88
ACKNOWLEDGMENTS
LITERATURE
LITERATURE CITED
CITED ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
.......................................................... 88
APPENDIX
9
APPENDIX..................................................................
9
TABLES
TABLES
Number
Number
11
2
2
~
Page
Annual summary
Annual
summary of
of recreational
recreational interview
interview data;
data; Garibaldi
Garibaldi
Flat,
Bay .............................................. 10
Flat, Tillamook
Tillamook Bay
10
Annual summary
Annual
summary of
of recreational
recreational interview
interview data;
data; Bay
Bay Ocean,
Ocean,
Tillamook
Bay .................................................... 11
TillamookBay
11
3
3
Annual
Annual summary
summary of
of recreational
recreational interview
Boat Basin,
Basin,
interview data;
data; Boat
Tillamook
Bay .................................................... 12
TillamookBay
12
0·0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
•
4
4
Annual summary
summary of
of recreational
recreational interview
interview data;
data; Happy
Camp,
Annual
Happy Camp,
Netarts Bay ...................................................... 13
NetartsBay
13
5
5
Annual summary
Annual
summary of
of recreational
recreational interview
interview data;
data; Cape
Cape Lookout
Lookout
Sand
Netarts Bay
Bay ........................................... 14
14
Sand Spit,
Spit, Netarts
66
Annual
Annual summary
summary of
of recreational
recreational interview
interview data;
Little
data; Little
Nestucca
Flat, Nestucca
Bay ...................................... 15
15
Nestucca Flat,
Nestucca Bay
77
Annual summary
summary of
of recreational
recreational interview
Annual
interview data;
data; Bridge
Bridge
Bed, Yaquina
Yaquina Bay
Bay ................................................. 16
16
Bed,
0·
8
8
Annual
summary of
of recreational
recreational interview
interview data;
data; Breakwater
Annual summary
Breakwater
Bed, Yaquina
Yaquina Bay
Bay ................................................. 17
Bed,
17
9
9
Annual summary
summary of
of recreational
recreational interview
Point,
Annual
interview data;
data; Idaho
Idaho Point,
Yaquina
Bay ...................................................... 18
18
YaquinaBay
0·
0·0
10
10
Annual summary
Annual
summary of
of recreational
recreational interview
Northwest
interview data;
data; Northwest
Gas Plant, Yaquina
Yaquina Bay
Bay ....•.............•.....•............•.....
GasPlant,
........................................... 19
19
11
11
Annual
summary of
of recreational
recreational interview
Annual summary
interview data;
data; Coquille
Coquille
Point, Yaquina
Yaquina Bay
Bay ............................................... 20
20
Point,
12
12
Annual
Annual summary
summary of
of recreational
recreational interview
Critser's
interview data;
data; Critser's
Island,
Bay .............................................. 21
Island, Yaquina
Yaquina Bay
21
13
13
Annual
Annual summary
summary of
of recreational
recreational interview
interview data;
data; North
North Bank
Bank
Softshell, Yaquina
Yaquina Bay
Bay ........................................... 22
Softshell,
22
14
14
Annual
summary of
of recreational
recreational interview
Shore,
Annual summary
interview data;
data; North
North Shore,
Alsea
Bay .....•............................................•.....
23
AlseaBay
........................................................ 23
15
15
Annual
summary of
of recreational
recreational interview
data; Bayshore,
Annual summary
interview data;
Bayshore,
Al sea Bay ........................................................ 24
24
AlseaBay
16
16
Annual summary
summary of
of recreational
recreational interview
interview data;
Breakwater,
Annual
data; Breakwater,
Al
sea Bay
Bay ........................................................ 25
25
Alsea
17
17
Annual
Softshell,
Annual summary
summary of
of recreational
recreational interview
interview data;
data; Softshell,
Al
sea Bay ........................................................ 26
26
AlseaBay
TABLES
TABLES (continued)
(continued)
Number
Number
18
18
Page
Page
Annual
summary of
recreational interview
Fork,
Annual summary
interview data;
of recreational
data; North
North Fork,
Siuslaw
Bay ...................................................... 27
27
SiuslawBay
19
19
Annual summary
summary of
recreational interview
data; Bolin
Island,
Annual
of recreational
interview data;
Bolin Island,
Umpqua
Bay ....................................................... 28
28
UmpquaBay
20
20
Annual summary
summary of
of recreational
recreational interview
data; Hanson's
Hanson's
Annual
interview data;
Marina
- South
South Slough,
Coos Bay
Bay .................................. 29
29
Marina Slough, Coos
21
21
Annual
summary of
of recreational
recreational interview
interview data;
Annual summary
data; Charleston
Charleston
Triangle,
Coos Bay
30
Triangle, Coos
Bay ............................................... 30
22
22
Annual
summary of
recreational interview
Annual summary
interview data;
data; Charleston
Charleston
of recreational
23
23
Annual summary
summary of
recreational interview
data; Peterson
Flat,
Annual
Peterson Flat,
of recreational
interview data;
Coos Bay ......................................................... 32
CoosBay
32
24
24
Annual
summary of
recreational interview
interview data;
Pigeon Point,
Point,
Annual summary
of recreational
data; Pigeon
Flat, Coos
Coos Bay
Bay ................................................... 31
31
Flat,
Coos
CoosBay
Bay.........................................................
·
33
25
25
Annual
summary of
recreational interview
interview data;
Empire Flat,
Flat,
Annual summary
of recreational
data; Empire
26
26
Annual summary
summary of
of recreational
recreational interview
North Spit,
Spit,
Annual
interview data;
data; North
Coos Bay ......................................................... 35
CoosBay
35
27
27
Coos
Bay .........................................................
"
34
CoosBay
34
Annual summary
summary of
of recreational
recreational interview
Clam Island,
Island,
interview data;
data; Clam
Annual
Coos
Bay ......................................................... 36
CoosBay
36
28
28
Annual summary
summary of
of recreational
recreational interview
Annual
interview data;
data; Bandon
Bandon Softshell,
Softshell,
CoqUille
Bay .....................................................
.....•......••...•.......•..............••........... 37
37
CoquilleBay
29
29
Annual summary
summary of
of recreational
recreational interview
Annual
interview data;
data; all
all estuaries
estuaries
comb;
ned .....•...................................................38
combined.........................................................
38
30
30
Peak
clam diggers
di ggers ...................................... 40
Peak counts
counts of
of clam
40
31
31
Summary of
of pounds
pounds of
of bay
bay clams
clams reported
Summary
reported commercially
commercially
harvested in
in Oregon
Oregon by
by species,
species, 1970-87
harvested
1970-87 .......................... 41
41
32
32
Summary
bay clams
reported commercially
commercially
Summary of
of pounds
pounds of
of bay
clams reported
harvested
in major
major Oregon
Oregon estuaries,
estuaries, 1970-87
42
harvested in
1970-87 .•....•.•.•...•....•.
..................... 42
33
33
Summary
littleneck clam
clam plants
plants in
in
Summary of
of experimental
experimental Manila
Manila littleneck
Tillamook
8ay, 1971-87
1971-87 .......................................... 47
47
Tillamook Bay,
34
34
Summary
littleneck clam
clam plants
plants
Summary of
of experimental
experimental Manila
Manila littleneck
in
1970-87 .......................................... 49
49
in Yaquina
Yaquina Bay,
Bay, 1970-87
TABLES (continued)
(continued)
TABLES
Number
Number
Page
Page
35
35
ANOVA for
on clams/ft2
ANOVA
for aa two-factor
two-factor analysis
analysis of
of variance
variance·on
clams/ft 2....•.••.
52
......... 52
36
36
ANOVA
for on
on factor
ANOVA for
factor analysis
analysis of
of variance
variance on
on substrate
substrate type
type
2
andclams/ft
53
and clamsjft.....................................................
"
".. ""
""" . "
".. "
""
53
0
"
37
37
Multiple comparisons
comparisons of
of survival
survival of
of Manila
Manila clams
clams planted
planted in
in
Multiple
53
one factor
factor ANOVA,
1987 ...•.•...•.......•
various
types, one
various substrate
substrate types,
ANOVA, 1987
.................. 53
38
38
Summary
littleneck clam
plants in
in
Summary of
of experimental
experimental Manila
Manila littleneck
clam plants
55
Coos Bay,
Bay, 1973-87
1973-87"................................................
""" . " " " . " . "
"""
" "" " "
""
,,55
39
39
Population
estimates (95%
(95% el)
clams
Population and
and biomass
biomass estimates
CI) for
for gaper
gaper clams
in
Bay, Area
Area 2,
2, 1975-87
1975-87 .................................. 58
58
in Yaquina
Yaquina Bay,
FIGURES
FIGURES
Number
Number
£.ggg
Page
11
Length
Length composition
composition of
harvested bay
bay clams,
clams, all
all
of recreationally
recreationally harvested
bays combined,
combined, 1975-87
bays
1975-87 ......•.•....•.......•.....•..............
39
.......................................... 39
22
Age
Age composition
composition of
of commercial
commercial subtidal
subtidal native
native littleneck
littleneck clam
clam
harvest,
Nehalem Bay,
Bay, 1984-87
1984-87 ................................... 43
43
harvest, Nehalem
33
Age
composition of
Area 2,
2, Yaquina
Yaquina Bay,
Bay,
Age composition
of subtidal
subtidal gaper
gaper clams,
clams, Area
1980-87"
44
1980-87 ......................................................... 44
4
4
Age
Age composition
composition of
of commercial
commercial subtidal
subtidal littleneck
littleneck clam
clam harvest,
harvest,
Tillamook Bay,
Bay, 1987
1987 ............................................
.........................•.......•...•......•.44
44
Tillamook
55
Age composition
composition of
of commercial
subtidal gaper
gaper clam
clam harvest,
harvest,
Age
commercial subtidal
Pigeon Point,
Point, Coos
Coos Bay,
1984-87 ................................. 45
Pigeon
Bay, 1984-87
45
6
Age
composition of
of commercial
commercial intertidal
intertidal cockle
cockle clam
clam harvest,
harvest,
Age composition
Gas
Plant, Vaquina
Yaquina Bay,
1987 .................................... 46
46
Gas Plant,
Bay, 1987
77
Location of
of Manila
Manila littleneck
releases in
in Yaquina
Yaquina Bay,
Bay,
Location
littleneck clam
clam releases
54
1987
"
54
1987 ............................................................
88
Subtidal
clam survey
survey area
area in
in Yaquina
Yaquina Bay,
Bay, 1987
1987 .............•..•..
Subtidal clam
................... 56
56
6
1987 BAY CLAM DATA SERIES REPORT
INTRODUCTION
This report summarizes the results of our bay clam studies
in 1987
1987.
Activities summarized include recreational and
fishery monitoring, hatchery
hatchery stock
stock enhancement,
enhancement,
commercial clam fishery
and natural recruitment studies
studies.
This report is presented as
as aa
series of tables and figures
figures with aa minimum of discussion;
discussion, other
reports will evaluate the data presented
presented here.
here.
The tables and
figures
figures included give aa historical
historical overview of
of clam harvesting
activities
activities and are presented in
in aa manner to
to allow future analysis
to show trends or changes in stock status and fishing activities.
activities.
This report is intended primarily to be an internal document,
document, to
be used as a reference by the
the shellfish
shellfish staff.
staff.
RECREATIONAL CLAM
CLAK FISHERY
PISHERY
digger·interviews
Recreational clam digger
interviews are conducted annually
on each of
of the
the major clam harvesting tideflats
tideflats of the Tillamook,
Tillamook,
Netarts, Nestucca,
Yaquina, Alsea,
Siuslaw, Coos,
Coos, and Coquille
Netarts,
Nestucca, Yaquina,
Alsea, Siuslaw,
estuaries.
Interviews are usually conducted by two shellfish
staff members.
A
A count of diggers is made on each tideflat at
peak digger
digger count
count for
for that
that day.
day.
low tide;
tide; this provides aa peak
Currently,
Currently, ,an
an effort is made to visit each tideflat at least two
times
season, in
in the
the spring
spring and
and again.in
again in midsummer.
midsummer.
times per
perseason,
is
This is
about half of the sampling effort that we expended annually from
from
1975 to 1984 to collect recreational use
use data.
data.
11
We attempt to measure and age a minimum of 100 clams of each
species for
for each • tideflat.
tideflat •
cockle
We measure the height of the cockle
butter, gaper,
littleneck, and
clam and the length of the butter,
gaper, littleneck,
clams.
softshell clams.
We age the various
various species of clams by counting
on the
the shell
shell surface.
surface.
annulli on
The total number of annual checks
is
recruitment.
is back-calculated to give year of recruitment,
collected included catch/effort,
catch/effort, digger
Interview data collected
origin,
species, age,
age, and length composition.
origin, species,
composition
These data are
presented for each tideflat in Appendix Tables 1-28.
1-28
Table 29
29
summarizes the recreational
recreational activities presented in Tables 1-28
and Table 30 shows the peak counts of clam diggers
diggers taken at low
for each
each of
of the
the surveyed
surveyed tideflats,
tideflats.
tide for
In 1987,
1987, we interviewed 1,508
1,508 clam diggers
diggers that expended
2,154
25,313 clams
clams (Table
(Table 29).
29).
2,154 hours of effort to harvest 25,313
The
clam diggers averaged 16.8
16.8 clams/trip
clams/trip or
or 11.8
11.8 clams/hour.
clams/hour.
Digging success was
was slightly poorer in 1987
1987 then
then in 1986 when
17.7 clams/trip were
were taken.
taken.
This decrease was influenced by
poorer digging on several
several major
major clam
clam beds
beds in
in Netarts,
Netarts, Yaguina,
Yaquina,
Coos bays.
bays.
and coos
Since 1977,
approved aa
1977, when
when the
the Commission
Commissionapproved
20, clam digger harvest has
reduction in bag limit from 36 to 20,
ranged between 14.7
14.7 and
and 18.8
18.8 clams/trip.
clams/trip.
In 1976,
prior.to
1976, prior
to the
limit, clam
clam diggers
diggers averaged
averaged 20.9
20.9 clams/trip.
clams/trip.
reduced bag limit,
As in
in.previous
previous years,
years, most clam diggers traveled some
distance
to harvest
harvestálarns..
clams. In 1987,
35.6% of the diggers were
1987, 35.6%
distance to
residents, 53.4% were from Oregon but living outside
local county residents,
the county of harvest,
harvest, and 10.9% were out-of-state residents
(Table 29),
29).
These figures were generally the
the same
same as
as in
in 1986.
1986.
22
since
1976, there has been a gradual increase in the percentage
Since 1976,
of local.
local diggers
diggers participating
participating in
in the
the fishery,
fishery, whereas
whereas the
ofout-of....state
the
percentage of
out-of-state residents has remained nearly the
same.
in
The cockle clam was the most frequently observed species in
the recreational fishery representing 41.7% of the 1987 harvest
29).
(Table 29),
Gaper,
softshell and littleneck clams
Gaper, butter.,
butter, softshell,
comprised 24.0,
the bag,
bag, respectively.
respectively.
24.0, 15.3,
15.3, 12.4,
12.4, and
and 5.2%
5.2% of·
ofthe
fluctuate annually
annually but the general trend shows
shows aa
These values fluctuate
in the gaper and softshell harvest and
.and an
~n
gradual decline in
increase in the take of cockle
cockle and
and butter
butter clams,
clams.
clams have not shown
shown aa trend
trend in
in the
the harvest.
harvest.
Littleneck
The reduced
poor
occurrence of gaper clams can be partially attributted to poor
recruitment of this species in
in a number
nUmber of our more popular
popUlar clam
clam
beds,
Happy Camp
Camp in
in Netarts
Netarts Bay.
Bay.
beds, especially at Happy
Length composition data collected for each species shows aa
increase in
in mean size for
for the softshell since 1984,
1984, the
the
gradual increase
butter clam since 1985,
1985 and the littleneck
littleneck clam since 1986.
1986.
since
Decreases in mean size were observed for the cockle clam since
1985,
clam since
since 1986
1986 (Table
(Table 29).
29).
1985, and the gaper clam
Data collected
on length composition since 1979 revealed only minor variations
size for
for each
each species
species (Figure
(Figure 1),
1).
in overall mean size
Gaper,
softshell,
cockle, and littleneck clams averaged 107.9
softshell, butter,
butter, cockle,
rom, 92.7 mm,
rom, 83,0
83.0 mm,
rom, 61.9
61.9 mm,
rom, and 53.2
53.2 mm
rom in
in 1987,
1987, respectively.
respectively.
mm,
Changes in digging effort through time as reflected by peak
increase in
in digging effort from
from
digger counts revealed a general increase
1986 for most of the surveyed tideflats
tideflats (Table
(Table 30).
30).
3
3
The largest
largest
increase in peak digger,
digger counts
counts was
was .observed
observed for
for the
the North
North Spit on
Coos
158 diggers).
Coos llay
Bay (83
(83 to
to,158diggers).
There was
was no
no apparent reason
observed for this increase
increase in
in digging
digging activity..
activity.
COMMERCIAL CLAM HARVEST
In 1987,
1987, we issued 121 permits
permits to commercial
commercial fishermen to
clams.
harvest bay clams.
of clams (Table
(Table 31).
31).
Of this total 34 reported landing 46,283 lb
This is about half of the 1986 harvest when
40
landing 82,609
82,609 lb
lb of
of clans.
clams.
40 clam diggers reported landing
Of the
total
t~tai clams
clams landed.
landedin
in 1987,
1987, 43.6%
43.6% (20,202
(20,202 lb)
lb) were
were cockles,
cockles.
Tillamook Bay was the major producer with 81.5%
(16,460 lb)
lb) of
81.5% (16,460
the
the 'total
total cockle
cockle 'harvest.
harvest.
Other 'clams
clams harvested
harvested coastwide
coastwide were
littlenecks (14,140
(14,140 lb),
lb), gapers (6,368
(6,368 lb),
lb), butters
butters (3,046
(3,046 lb),
lb),
and softshells
softshells (2,527
(2,527 11,).
lb).
The continuous decline in harvest of
1982, when 106,440 lb were taken,
gaper clams since 1982,
taken, again
illustrates
illustrates poor recruitment of this
this species
àpecies in
in several
several of our
bays.
Tillamook
Bay produced
lb
Tillamook Bay'
produced the
the most
most clams
clams in
in 1987
1987 with
with 22,936 lb
(Table 32),
32).
reported (Table
Coos bays produced
produced 10,723
10,723 lb,
lb,
Nehalem and Coos
and 10,214 lb,
lb, respectively
respectively.
Yaquina,
Yaquina, Siuslaw,
Siuslaw, Coquille,
Coquille, and
produced minor
minor poundages
poundages of
of clams.
clams.
Alsea bays produced
We collected age and length composition data for
commercially
commerdially harvested subtidal native littleneck clams
clans in
Nehalem Bay,
Bay, gaper
Bay, cockle and littleneck clams in Tillamook Bay,
clams
Bay, and intertidal
intertidal cockle
cockle clams
clams in
in Yaquina
Yaquina Bay.
Bay.
clans in Coos Bay,
Figure 2 shows that the 1983 and 1984 year-class littleneck clams
dominated the Nehalem Bay
Bay commercial
commercial harvest
harvest in
in 1987.
1987.
averaged 40.6
40.6 mm
mm in
in length.
length.
harvested clams averaged
4
The
1986, the clans
clams
In 1986,
averaged
averaged 41.8
41.8 nun
nun in length.
length.
Cockle clams
clams harvested subtidally in
Cockle
in
Tillamook Bay
Elay were primarily of the 1982 and 1983 year-classes
year"classes
3).
(Figure 3).
six
Six year-classes were represented in the harvest and
the harvested
averaged 62.8
62.8 mm
nun in
in length.
length.
harvested clams averaged
Littleneck clams
were
were· dominated by
by.the
the 1982
1982 year-class in.the
in the Tillamook
Tillamook Bay
Bay
The clams
clams averaged
averaged48.1
48.1iran
nun in length,
length.
The
harvest (Figure
(Figure 4).
4).
In
Coos Bay,
Bay, gaper clams harvested were primarily of the 1975
and. averaged 132.9 mm
nun in
in length (Figure
(Figure 5).
5).
year-class and
Gapers
harvested in
in 1986 averaged
averaged 130.8
130.8 mm.
nun.
We rarely encountered commercial
conunercial fishermen harvesting clams
clams
intertidCl.lly.
intertidally.
one·occasion
checked the
the.conunercial
On one
occasion we cheoked
commercial harvest
of a
a fisherman in
in Yaguina
Yaquina Bay
Bay taking
taking cockles
cockles for
for crab
crab bait.
bait.
The
harvest was dominated by the 1985 year-class and the clams
averaged
in length
length (Figure
(Figure 6).
6).
averaged 52.1
522. nun
mmin
SPECIAL STUDIES
Hatchery Stock Enhancement
Tillamook Bay
flhlamook
No Manila clams were planted in Tillamook Bay in
in 1987.
Clams planted in test plots in 1984 and 1985 were sampled for
for
growth and survival.
survival.
Table 33
33 sununarizes
summarizes the results of our
Manila clam plants in
in Tillamook
Tillamook Bay
Bay since
since 1971.
1971.
Of particular
interest
interest was
was the difference
difference in
an survival
survival of clams placed under
netting as
as compared
compared to
to uncovered
uncovered clams.
clams.
Vexar netting
Covered clams
showed aa 15.0%
15 0% survival of juvenile clams,
clams, 25 months after
release,
0.3%
survival for
for clams planted with no
release, as compared to 0
3% survival
protection.
Clams planted as adults in 1985 had survival rates
5
ranging from
from 52
52 to
to 90%,
90%,26
ranging
26 months
months after
after release.
release.
These clams
planted without
without protection
protection of
of Vexar
Vexar netting.
netting.
were planted
Yaquina Bay
Manila clam set planted under Vexar netting near King slough
Slough
in 1985 revealed aa survival-rate of 72%,
in.l985
72%, 20
20 months
months later (Table
34).
clams, 18,1mm
18.1 mmwhen
whenplanted,
planted, averaged
averaged41.2
41.2 mm.
mm in
These clams,
length.
1987, we sampled each of the 14
14 test plots
During 1987,
established in 1986 to determine if various introduced substrate
could impact
impact survival
survival of
of Manila
Manila clam
clam set
set (Gaumer
(Gaumer 1990).
1990).
materials could
Also tested was the impact of '1/2-inchVexar
Clam
l/2-inch.Vexar netting on clam
survival.
Preliminary results of our tests revealed that at the 95%
confidence level survival of clams released under netting was not
significantly different than for
for those left uncovered whereas
substrate material did have a highly significant impact on
survival of clams (Table
(Table 35).
35).
When comparisons in survival
survival of
clams were
were made between substrate types,
types, highly
highly significant
for clams released in a
a
differences were recorded especially for
substrate
substrate containing aa combination of pea
pea gravel
gravel and
and ground
ground
oyster shell (Tables
(Tables 36-37).
36-37).
No significant differences
differences in clam
survival
releases in any
survival were realized for clams releases
any of the
the other
types.
sediments or combination of sediment types
1987, we continued to release hatchery produced Manila
In 1987,
in Yaquina
Yaquina Bay
Bay near
near King
King Slough
Slough (Figure
(Figure 7)
7).
littleneck clams in
placed an estimated 100,000 clams averaging 6
6.77 mm and at aa
6
[I
We
we
density of
:100/sq ft
ftunder:Vexar
under:Vexar netting
netting and
and 20;000
20,000 were
wereplanted
ofl00/sq
planted
with no protection.
Coos Bay
CoøsBay
Table 38 shows the results of our Manila littleneck clam
plants
»> in Coos Bay since
since 1973.
1973.
plants:in
We sampled the .1984,
1984, 1985, and
1986
1986 planted
planted clams
clams in
in 1987
1987 and recorded
recorded survival
survival rates>
rates ranging
from 0.8% to 88.7%.
88.7%.
The poorest survival (0.8%)
(0.8%) was for
for clams
without Vexar
Vexar protection
protection near
near Valino
Valino Island.
Island.
planted without
Clams
netting, produced a survival rate of
of
released nearby under Vexar netting,
34.4%.
34,4%.
Natural Recruitment Studies
studies
Yaquina
Yaguina Bay
11 subtidal
subtidal dredge samples
samples from
from an
an 18.4
18.4 acre
acre
We collected 11
area in Yaquina Bay in September 1987 to determine year-class
strength, recruitment success,
success, and population and bionass
biomass
strength,
estimates (Figure
(Figure 8).
8).
ft of surface
surface
Each sample covered 1 sq ft
area:;·depth
of samples
samples averaged
averaged 12-14
12-14 inches.
inches.
area;
depth of
(9.5/sq ft)
ft) that
The 11 samples produced 104 gaper clams (9.5/sq
averaged 117.5 mm
mm in
in length.
length.
No evidence of recruitment of gaper
clams was observed nor were any 1979-86
1979-86 year-class clams
from the
the area.
area.
recovered from
The 1975 year-class
year-class continued to
dominate the standing crop comprising 56.7% of the 1987 sample
9).
(Figure 9).
We estimated that 7.6 million gapers,
6.5
gapers, weighing 6.5
million lb,
lb, inhabited
inhabited the
the area
area (Table
(Table 39).
39).
Netarts Bay
In addition to the subtidal samples taken in Yaquina Bay,
Bay, we
collected five
five 1 sq ft
ft intertidal samples in Netarts Bay to
7
7
determine recruitment
recruitment success.
success.
Each sample averaged 3 inches in
depth and was washed
washed through
through aa 33 mm
rom sieve.
sieve.
The five
five samples produced five 1987 year-class gaper
gaper clams
(1.0/sq ft)
ft) (Figure
(1.0jsq
(Figure 10).
10).
5.7 mm
rom in
in length.
length.
These clams averaged 5.7
evidence of
of 19S6
1986 year-class
year-class gapers
gapers was
was observed
obs.erved in
inthe,
the
No evidence
samples.
samples
SIGN REPLACEMENT
In 1987,
1987, the shellfish staff continued aa coastwide project
of repairing or replacing
replacing regulation
regulation signs.
signs.
We currently are
maintaining 187
187 signs
signs along
along the
the Oregon
Oregon coast.
coast.
maintaining
ACKNOWLEDGMENTS
II wish to thank Darrell Demory,
Demory, Terry
Terry Link,
Link, Jean
Jean McCrae,
McCrae,
Neil Richmond,
Richmond, Mark Saelens and Rick Starr for
for their assistance
in gathering the data used in
in this
this report.
report.
LITERATURE CITED
Gaumer, Thomas
Thomas F.
F. 1990..
1990.
1986
Report, Ore,
Ore.
1986 Bay
Bay Clam
Clam DatacSeries
DataSeries Report,
Dept.
wildlife, Proc.
Proc. Rept.
Rept. 54
54 pp.
pp.
Dept. of Fish and Wildlife,
8
I
APPENDIX
9
Table 1.
1.
Table
Annual summary
Garibaldi Flat,
flat,Tillamook
Tillamook Bay.
Bay.
Annual
suninaryofofrecreational
recreational interview
interview data;
data; Garibaldi
1963
1963
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No.
Digger Hours
Hours
No. Digger
Hours/trip
Cl
ams/tri p
Clams/trIp
758
19,053
-
-
25,1
25.1
Clams/hour
1971
1971
1975
1976
19771
1977k
1978
1979
1980
319 13,048
8,414 389,946
-- 20,439
104
2,472
252
4,647
336
239
239
4,631
261
261
597
11,104
715
456
8,728
-
207
4,825
283
---
1.4
23.3
17.0
1.3
18.4
13.8
1.1
19.4
17
.7
17.7
1.2
18,6
18.6
15,5
15.5
-
32.9
57.0
27,8
27.8
57.3
33,1
33.1
55,2
55.2
30.2
64,7
64.7
1965
22.9
--
1.6
29,9
29.9
19.1
38,0
38.0
62.0
21.0
73,0
73.0
23,8
23.8
(%)
Digger
Digger Origin (%)
local
Local
State
Non-state
Norm-state
Comp, (%)
(%)
Species Comp.
Butter
Cockle
Gaper
littleneck
Littleneck
cnftch11
Softshell
-o
>-'
a
Clams/trip
Butter
Cockle
Gaper
Littleneck
Sgftshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
littleneck
Softshell
Camp. (x
size)
Size Comp.
(x size)
Butter
Cockle
Gaper
littleneck
Littleneck
cMth11
Soft
shell
-
-
-
27,0
27.0
45.0
7,0
7.0
21.0
-
-
1.2
18,3
18.3
14.0
1.3
19,4
19.4
14.6
1.2
18,7
18.7
15.6
1.2
18.7
15.4
1.3
19,9
19.9
14.9
1.1
19.3
18,0
18.0
1.1
1,1
19,8
19.8
17.6
22,4
22.4
72,6
72.6
27,6
27.6
63,5
63.5
-
-
38,8
38.8
57.1
4,1
4.1
37,7
37.7
46,9
46.9
15,4
15.4
30.0
67.5
2.5
28,0
28.0
66,4
66.4
5.6
17.9
78,6
78.6
3.4
23,5
23.5
67,9
67.9
8.7
-
9,6
9.6
12,7
12.7
41.6
48.7
1.3
8,0
8.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5.0
4.9
1.6
4,9
4.9
10.3
1.3
7.0
4,2
4.2
6.6
4.3
8.1
1.9
8.6
3.2
4.6
2,2
2.2
12.9
1.4
2.8
2,5
2.5
11.9
1.8
2.4
24
5,5
5.5
8.9
1.4
3.4
7,8
7.8
4.4
1.4
5.0
8,9
8.9
5.3
1.2
4.0
7.4
5.1
0.9
5.3
7,2
7.2
5.3
0.1
6.0
7.9
8.6
0.4
3.1
6.3
9.9
0.2
2.9
8.2
9.7
0.2
1.6
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
..
--
--
3.1
4.9
3.2
5.9
1.5
1.5
6.5
2.4
3.5
2.0
11.8
1.3
2.6
2.1
9.9
1.5
2.0
4,6
4.6
7.4
1.1
2.8
6.3
3.6
0.9
4.0
6.7
4.0
0.9
3.0
6.2
4.3
0.7
4.4
6.0
4.4
0.1
4.9
5.9
6.5
0.3
2.3
5.9
9.2
0.2
2.7
7.3
8.6
8:6
0.2
1.4
83.0
55.2
82.0
38.2
72.3
60.9
84.2
38.5
64.8
55.0
90.2
36.5
70.6
56.9
91.3
91,3
39.5
70.3
60.1
114.1
38.0
68.8
54.0
107,9
107.9
37.0
78.4
52.8
108.0
38.3
71.4
58.9
106.9
39.5
75.5
58.7
99.4
39.9
79.4
60.6
67,9
40.4
..
-
-
-
-
-
-
-
-
-
145
637
84
233
555
1,501
327
171
304
535
111
187
413
254
481
481
407
203
203
240
241
267
17
17
131
131
231
231
360
81
251
251
379
389
77
392
110
88
31
142
-
-
-
-
-
-
77.3
63.9
67.5
36.7
81.6
64.3
56.8
36.8
83.8
55.9
69.3
39.4
-
-
-
-
-
-
No. Clams
Clams Measured
No.
NeSured
I
1.2
19,1
19.1
15.9
549
32,9
32.9
51.0
1.0
15,1
15.1
-
219
536
8utter
Butter
--Cockle
290
978
-74
Gaper
349
518
Littleneck
297
Softshell
Regulation changeln
effective-january
-1977.
Regulation
change inbag
bag·l-fmlt;
limit; effective
January 1,I,1977
-
277
5,491
312
39,5
39.5
43.2
1.8
15.4
-
-
290
5,598
311
38,8
38.8
28.5
0,7
0.7
32,1
32.1
3.2
3.1
1.1
11.7
-
107
2,128
143
39.7
27.4
4,5
4.5
28.4
-
--
200
3,729
243
45.8
27,4
27.4
6.0
20.8
-
--
443
132
2,471
158
42,8
42.8
24,2
24.2
5.7
27,2
27.2
-
-
219
219
4,249
220
220
28.7
28,7
46,5
46.5
7.1
17,7
17.7
18.4
-
359
6,558
13.5
64,0
64.0
-
-
1987
11,5
11.5
66,6
66.6
7,1
7.1
14,7
14.7
-
-
-
1986
10.5
46,7
46.7
17,2
17.2
24,9
24.9
--
-
-
1985
18,2
18.2
28,5
28.5
18.5
34,7
34.7
6,8
6.8
11.3
1.8
5.3
-
-
1984
20,7
20.7
43,4
43.4
5.3
29,7
29.7
-
-
-
1983
16,3
16.3
16.8
5,4
5.4
60.8
-
-
-
1982
1982
1981
-
394
1,517
538
862
21
21
2
461
236
2
5
5
--
322
Table 2.
Table
Annual
recreational interview
interviewdata;
data;Bay
BayOcean,
Ocean. Tillamook
Tillamook Bay,
Bay.
Annual summary
sumary of
of recreational
1971
1971
1976
19771
1977±
1978
1979
1980
1981
1982
1983
1984
1985
1986
1985
1987
No. Diggers
Di99~rs Sampled
Sampled 10,379
No.
No. Clams
Clams Sampled
Sampled 215,728
216,728
No.
No.
Di,dqerHours
16,156
No. Di4ger
Hours
15,156
94
2,242
171
170
2,664
333
38
38
574
70
79
79
1,063
146
119
1,465
216
216
34
314
11
11
63
16
15
11
11
161
151
12
12
17
17
314
23
23
31
557
38
2
2
58
58
13
11
17
1.6
16
2.0
20
15.7
On
8.0
1.9
19
15.1
no
8.2
1.8
18
13.5
7.3s
1.8
18
12.3
C.O
6.8
1.7
17
9.2
<0.1
Clams/hour
1.8
18
23.9
151
13.1
5.5c
'fit
<0.1
1.6
16
5.7
SO
3.9
1.1
11
14.6
ISA
13.4
1.4
14
18.5
157
13.7
1.2
12
18.0
IA?
14.7
1.0
10
20.9
ISA
13.4
Digger
(%)
Digger Origin (7.)
Local
local
State
Non';state
Non-state
21.0
73.0
16.0
16.0
20.2
74,5
74.5
5.3
14.7
79.0
6.5
13,2
13.2
76.3
10.5
10.1
89.9
21.8
15.4
84.6
-
18.2
18.2
81.8
11.8
88.2
25.8
64.5
9.7
100.0
<0.1
85.0
8.8
1.3
0.1
85.8
12.3
0.1
0.6
78.5
17.5
0.8
--
-
27.8
49.2
20.1
2.9
-
87,2
87.2
12.2
-
-
-
<0.1
0.1
12.3
2.7
0.1
Hours/trip
Clams/trip
Species
Compo (%)
(%)
Species Coop.
Butter
Cockle
Gaper
Littleneck
Softshell
......
-a
......
-a
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Site
Size Compo
Coop. (x
(x size)
Butter
Cockle
Gaper
LittlEmeck
Littleneck
Softshell
--
<0.1
17.1
17
.1
1.8
0.3
--
<0.1
11.0
1.1
0.2
-----
-
-
20.5
2.9
<0.1
--
-
-
<0.1
11.3
11.3
1.6
<0.1
<0.1
6.3
1.4
0.1
-
-
-
-
-
-
--
--
-
13.2
1.8
--
-
7.1
1.0
-
-
-
-
-
66.0
660
66,1
661
107.9
1079
64.0
640
104.7
1047
110.6
1106
---
-
-
-
-
5.0
20.6
70.6
8.8
-
0.4
89.6
7.1
0.5
74.2
1.3
1.3
-
-
91.4
8.0
0.1
---
12.3
1.1
<0.1
-
-
6.7
5.7
0.6
<0.1
--
-
-
-
--
<0.1
11.0
0.9
<0.1
--
<0.1
6.1
0.5
0.1
--
6.9
0.1
0.1
-
-
4.1
0.1
-
-
-
68.4
684
109.3
1093
42.0
71.2
712
106.2
1062
;;.;
-
No.
Clams Measured
Measurgd
No. Clams
Butter
-Cockle
- 1,075
781
525
318
118
68
Gaper
224118
-224
79
Littleneck
Softshell
-I Regulation
effectiveJanuary
January 1,
I, 1977
1977.
Regulation change
changeininbag
baglimit;
limit; effective
-
73.1
-
277
44
,--
-
60.6
606
105.5
1055
37.0
1.3
13
-
72.7
27.3
-
--
-
-
-
95.2
100.0
100.0
-
-
-
--
-
-
-
5.5
-
14.6
-
-
-
-
-
-
<0.1
-<0.1
-
-
-
-
--
-
--
-
-
4.0
8.4
-
5.0
8.8
3.6
0.5
-
-
6.1
-
-
-
78.2
75.4
-
68.6
686
110.6
1106
--
71.0
710
101.4
1014
46.0
-
-
--
69.8
698
95.0
950
38.0
-
-
-
-
-
-
-
-
--
17
17
122
70
165
182
182
98
16
-
213
4
4
44
-
-
--
-
59
11
-
--
-
77
24
2
-
-
-
4.1
7.2
2.9
0.4
-
67.6
676
21.7
21,7
45.2
33.1
3.0
6.2
4.5
13.4
-
-
---
3.8
-
-
2
2
-
-
-
-
-
-
Table 3.
Table
Annual summary
interviewdata;
data;Boat
BoatBasin,
Basin.Tillamogk
TillamookBay
Bay.
Annual
sumary of
of recreational interview
1983
1984
1985
1986
1985
1987
99
224
22
57
57
1,033
78
14
14
273
21
21
27
27
539
57
18
360
19
Clams/hour
2.4
24.9
10.4
1.4
18.1
13.3
1.5
19.5
13.3
2.1
20.0
9.5
1.1
20.0
18.9
18.9
Digger Origin
Origin (%)
(%)
Digger
Local
Lucal
State
22.2
Lc.c
77.8
nil
21.1
'L..t
71.9
rAfl
50.0
jV.V
50.0
IA
7.4
I...
92.6
CA
A
50.0
J,J.0
50.0
-
7.0
-
-
-
24.6
24.5
34.8
8.5
32.1
17
.8
17.8
28.3
26.9
27.0
98.9
1.1
25.6
73.1
1.3
53.6
40.0
6.4
-
-
6.1
19.3
0.2
8.0
3.2
5.1
4.9
4.9
-
-
-
-
-
-
2.6
3.6
0,9
09
3.3
33
2.4
3.8
3,6
3;6
13.2
0.1
-
-
-
69.2
592
98.8
988
37.8
-
75.6
60.5
605
9B.4
984
42.1
101.7
1017
105.5
1055
-
-
-
47
59
205
No.
No. Diggers
Diggers Sampled
SamPled
No. Clams
Clams Sampled
Sampled
No.
No. Digger
Digger Hours
Hours
No.
Hours/trip
Clams/trip
Non:"state
Non-state
Compo (Y)
(%)
Species
Species Comp
BuUer
Butter
Cockle
Gaper
LiU1eneck
Littleneck
---22ftshe11
Softshell
-
.....
N
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
---22ftshe11
.,
8.7
8,7
2.1
Clams/hour
Butter
Cockle
Gaper
-Gaper.
Littleneck
Lfttleneck
Soft
shell
Softshell
Size
Compo (x
Size Comp.
Cx size)
BuUer
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
No.
Measured
No Clams Measured
Butter
Cockle
Gaper
LiU1eneck
Littleneck
Softshell
-
-
78
78--18
67
67
3.6
35
14
28
-
-
-
--
-
-
--:
-
5.1
14.6
0.3
2.6
6.9
0.1
10.2
7.6
1.2
-
-
-
97.2
704
70.4
-
-
22
10.7
8.0
1.3
-
21
39
-$9
-
--
83.0
69.2
592
127.0
1270
-
57
44
23
-
H
Table 4.
4.
Table
Annual
interviewdata;
data;Happy
HappyCamp,
Camp, Netarts Bay
Bay.
Annual summary
sunslaryofof recreational
recreational interview
1971
1975
19]6
19.76
19771
19774.
1978
No. DiggersSampled
Diggers'Sampled 5,106
No.
No. Clams
Clams Sampled
Sampled
85,230
No.
No. Digger
DiGGer HoUf
Holir's
No.
6,613
6.613
18
164
164
141
1,709
193
187
2,727
254
146
1,747
149
-
rlamqlhnnr
Clams/hour
1.3
13
16.7
12 0
12.9
9.1
1.4
14
12.1
A 0
8.9
1.4
14
14.6
in i
10.7
(%)
Oi9ger
Digger Origin (%)
Local
State
Non-state
17
17.6
.6
74.8
7.6
-
29.1
66.0
Species Comp.
Compo (%)
(%)
Butter
Cockle
Gaper
Littleneck
Snftshll
Softshell
2.6
1.0
95.7
0.8
47.1
Clams/trip
Butter
Cockle
Gaper
li
Littleneck
ttleneck
Softshell
0.4
0.2
16.0
0.1
3.3
-
Hours/trip
Clams/trip
.....
w
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size
Compo (x
Size Comp.
Cx size)
8utter
Butter
Cockle
Gaper
Littleneck
Softshell
-
-
-
-
-
-
36.6
15.9
--
1983
1983
106
71
71
991
991.
67
2,020
168
0.9
09
12.0
iq A
13.4
10.7
10,7
..
1984
1985
1985
1986
1986
1987
1987
280
2,994
2,994..
290
84
1,009
84
99
1,010
124
60
579
92
709
205
1.0
10
1.0
10
12.0
12 1
12.0
1.3
13
1.5
16
10.2
10.2
9.7
2.0
20
A
1
8.1
A
6.3
3.5c
31.7
66.7
1.7
10.7
87.4
I.g
1.9
103
0.9
09
12.7
fl A
13.8
12.2
10
1
19.1
0.9
09
12.9
14
14.8A
11.0
11,0
71.2
17.8
28.4
59.9
11.7
17
17.9
.9
73.6
8.5
40.3
50.6
9.1
48.2
44.0
7.7
22.5
72.9
4.6
29.8
64.3
5.0
14.9
75.9
9.1
6.0
32.3
53.5
14.1
20.8
0.1
73.6
5.3
9.2
21.9
.21.9
62.5
5.4
5.8
7.7
5.4
0.1
92.5
2.0
13.7
82.7
3.4
5.0
<0.1
94.3
0.6
0.7
0.1
98.5
0.8
3.7
4,0
4.0
89.5
2.9
4.0
0.4
93.6
2.1
7.9
2.1
84.6
5.4
15.9
2.1
73.1
8.3
-
-
~
-
-
-
-
-
0.7
<0.1
11.3
11.3
1.8
0.1
<0.1
10.5
0.1
0.4
0.5
10.8
0.4
0.4
<0,1
<0.1
9.5
0.2
0.8
0.2
8.2
0.5
0;
0.11
5.0
0.6
-
.-
-
0.5
0.1
5.3
0.3
0.6
0.1
2.5
0.3
-
4.3
1.4
1.3
3.2
9.1
0.8
-
-
-
222
222
2,823 . 1,293
2,823..
1982
1.0
10
12.0
ii 7
I
11.
2.5
<0.1
8.9
0.6
-
1981
68
--
0.3
0.1
12.3
0.1
1980
204
-
-
...
1979
--
91.0
3.1
-
90.3
-
0.2
-
--
0.7
1.0
10.9
0.4
11.5
0.2
-
0.7
--
0.6
06
-
151
in
10.3
0.2
0.4
0.6
0.5
<0.1
11.3
0.1
-
-
-
-
-
1.1
2.0
-
<0.1
0.7
12.3
0.5
12.7
12.7.
0.1
0.1
<0.1
10.2
0.1
10.8
0.4
0.3
<0.1
7.6
0.2
-
-
10.6
1.1
-
1.8
<0.1
6.5
0.5
1.0
2.3
6.7
0.6
10.7
10,7
0.4
12.5
0.3
1.0
1.0
<0.1
17.7
0.4
-
-
-
-
-
-
-
-
-
-
-
-
-
--
102.8
100.2
103.0
103.2
107.2
105.9
109.7
102.5
-
-
93.2
112.1
65.3
96.3
67.6
86.1
70.0
70.7
70.7
101.9
55.8
100.3
70.2
103.5
54.0
106.6
67.2
105.2
47.6
111.7
65.6
109.5
-
82.0
62.0
31.0
101.8
-
114.0
65.7
-
-
-
-
-
-
-
-
32
26
26
88
405
28
20
29
20
11
436
12
45
565
99
66
11
338
44
-
-
-
-
-
-
-
-
-
--
-
-
--
--
-
-
87.5
70.1
92.1
73.6
93.6
66.7
-
-
,.-
-,
24
109
No.
Clams Measured
Measured
No. Clams
8utter
Butter
66
219
-Cockle
190
Gaper
282
643
557
190
921
littleneck
99
Littleneck
43
43
28
54
Softshell
I Regulation
effectiveJanuary
January 1.I, 1977
1977.
Regulation change
changeininbag
baglimit;
limit; effective
98.9
7,.3
71..3
417
-
-
468
34
3
3
454
22
22
-
-
-
-
97.7
62
52
0.4
0.5
6.9
-
240
-
-
-
27
27
Table 5.
Table
Annual
Annual summary
sunnaryofof recreational
recreational interview
interview,data;
data; Cape
Cape Lookout
lookout Sand
Sand Spit,
Spit, Netarts
Netarts Bay.
Bay.
1985----r9BS1985
1986
1976
1977!
19771
1978
1979
1980
1981
1982
No.
Diggers Sampled
Sampled 6,473
No. Diggers
No. Clams
Clams Sampled
Sampled 115,811
No.
No. Digger
Oiqqer,'Hours
No.
Hours
8,656
8.656
43
1,038
76
2,433
148
509
9,293
1.055
72
1,324
1.324
149
85
1,560
178
63
1,074
89
80
1,397
150
56
1,029
83
118
118
2,174
2,178
197
71
71
1,362
87
1,040
1,040
1.9
32.0
16.5
2.1
18.3
8.8
2.1
18.4
18.4
2.1
18.4
18.4
8.9
8.8
1.4
17.0
12.1
1.9
17.5
9.3
1.5
18.4
12.4
1.7
1.7
18.4
11.1
1.2
19.2
15.8
22.2
77.8
-
36.5
61.2
2.3
17.5
17
.5
76.2
6.3
12.5
81.3
7.5
44.6
51.8
51,8
3.6
38.1
53.4
8.5
7.7
76.7
13.3
1.9
0.3
84.9
11.0
80.4
5.9
2.6
-
1.3
17.9
13.4
13.4
24.1
17
.6
17.6
74.8
7.6
-
23.7
76.3
-
-
23.1
66.6
10.6
38.4
44.4
8.9
6.9
49.0
46.0
2.7
1.3
15.8
16.8
76.9
3.7
3.2
6.6
72.3
15.3
2.1
2.0
72.7
22.4
1.3
5.5
74.4
16.0
3.8
1.9
93.3
4.8
-
-
-
-
-
-
-
6.9
8.0
1.6
1.2
11.8
11.1
0.7
0.3
5.1
24.6
1.2
1.0
0.4
13.4
4.1
0.2
1.0
13.6
2.9
0.7
0.3
15.9
0.8
-
-
1.2
13.2
2.8
0.4
---
-
2.6
12.7
0.6
0.5
0.6
6.4
1.3
1,3
0.2
-
-
-
--
Cockle
84.5
65.4
Gaper
108.1
71.8
73.0
87.4
74.1
75.7
103.4
-
80.3
73.3
80.4
57;8
578
-
-
-
Clams/houf
Clams/hour
Oigger
(%)
Digger Origin (%)
Local
State
Non-state
Compo (%)
(%)
Species Camp.
Butter
Cockle
Gaper
Littleneck
50ftshel1
Softshell
~
i9B4~~
1984
1975
Houfs/trip
Hours/trip
Clams/trip
~
'I9~
1983
1971
Clams/trip
Butter
Cockle
cockle
Gaper
Littleneck
Softshel1
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
LIttleneck
Softshel1
Size Camp.
Compo (x
Size
(x size)
Butter
Littleneck
Softshel1
Softshell
--
5.1
5.9
1.2
0.9
-
-
-
--
-
-
-
-
-
-
-
-
-
1.4
13.4
2.3
0.3
0.1
15.6
2.2
0.5
2.0
14.8
1.1
0.5
-
-
-
-
0.2
6.5
2.0
0.1
0.5
6.5
1.4
0.3
0.2
11.3
0.6
0.7
7.2
1.2
0.2
..
-
--
-
-
--
12.1
2.6
-
--
-
-
<0.1
1.6
20.0
12.2
2.2
19.5
9.0
2.1
19.8
9.4
43.7
52.1
4.2
53.8
44.2
1.9
31.0
40.5
28.6
26.8
62.0
11.3
11.3
11.0
78.0
16.0
82.1
0.2
1.7
7.0
89.5
3.4
0.1
10.6
10.6
83.1
3.2
0.9
85
-
71
-
2.1
15.0
1.7
<0.1
0.4
3.2
16.4
1.7
12.3
1.4
<0.1
fl
0.3
2.0
10.0
-
-
0.3
1.4
17.5
0.7
-
2.1
2,1
16.5
0.6
0.2
-
-
0.6
8.0
0.3
1.0
7.8
0.3
0.1
-
-
-
76.0
71.2
101.2
56.4
-
1.5
0.3
-
-
67.7
71.3
119.0
49.5
68.8
69.5
117.7
42.2
72.2
70.0
75.1
52.5
68.8
75.2
57.1
69.0
72.3
128.0
47.0
-
-
-
-
133
110
542
542
151
223
4
4
5
-
-
80.4
75.2
91.7
53.7
75.6
72.2
110.7
-
74.2
72.0
104.7
53.3
-
-
-
-
-
-
86
812
191
191
60
60
20
525
44
44
-
49
486
48
13
13
3
3
534
71
71
26
26
-
-
-
-
1,409
151
1.2
8.9
0.7
0.3
10,5
-1-0-5
76.9
72.7
100.5
57.9
No.
Clams Measured
Measured
No. Clams
Butter
237
237
80
32
294
11
11
Cockle
257
674
851
555
74
245
Gaper
170
52
257
36
144
Littleneck
31
12
Softshell
-1 Regulation
RegUlation change
effectiveJanuary
January 1,1,1977
1977.
changeininbag
baglimit;
limit; effective
--
42
42
819
92
9.0
0.1
1.8
52
52
-1987
1987
27
238
15
53
53.
-
0.2
-
-
2
14
49
277
12
11
-
-
-
240
18
18
2
-
Table
Table 66.
Annual sUlTl11aryof
data; little
NestuccaFlat,
Flat,Nestucca
Nestu'cca Bay
Bay.
little Nestucca
Annual
surmiary ofrecreational
recreational interview data
-
(]1
1985
1986
1986
····1987
1987
62
22
62
623.
1,386
623
94
34
23
561
38
14
431
431
2
2
57
57
27
6
1.5
15
22.4
224
14,7
14.7
1.7
17
24.4
244
14:8
14.8
1.9
19
308
30.8
16.3
3.0
30
28.5
285
9.5
21.0
59.7
19.4
4.3
52.2
43.5
42.9
57.1
100.0
-
-
19771
1977S
1979
1980
1981
1981
1982
No.
No. Diggers
Diggers Sampled
Sampled 1,466
No.
No. Clams
Clams Sampled
Sampled
23,211
No ~ Oi Qqer, Hours
1,584
34
1,049
43
16
484
21
1,120
38
23
357
27
22
653
31
Hours/trip
Clams/trip
Clams/hour
1.1
11
15.8
158
14.7
1.3
13
30.9
309
24.4
1.3
13
30.3
303
23.2
1.9
19
29.5
295
15.6
1.2
12
15.5
155
13.2
1.4
14
29.7
297
21.4
1.5
15
28.3
283
18.6
Oi9ger Origin
Ori9in (%)
(%)
Digger
Loca.l
Local
State
Non-state
12.4
73.5
52.9
47.1
--
-
--
4.5
86.4
9.1
18.2
77.3
-
86.8
13.2
13.2
13.0
87.0
87,0
14.1
18.8
18.8
62.5
18.8
18.8
-
-
-
-
-
-
Species Comp.
Compo (%)
(%)
Butter
Cockle
Gaper
Littleneck
Softshell
.....
tn
1984
1984
1971
Clams/trip
8utter
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size
Compo (x size)
size)
Size Comp
Butter
Cockle
Gaper
Littleneck
Softshell
No.
No. Clams
Clams Neasured
Measured
I
-
100
-
-
-
-
-
-
15.8
158
30.9
309
-
-
14.7
14.7
-
-
-
-
100
24.4
100
-
30.3
303
100
100
-
-
29.5
295
15.5
155
-
-
-
-
23.2
15.6
-
-
-
860
86.0
72
84.2
842
79.9
799
-
1983
100
100
-
29.7
297
4.6
-
-
100
100
-
-
-
-
.. 244
24.4
-
30.8
308
-
-
28.3
283
224
22,~_
.-
13.2
21.4
18.6
-
-
-
-
Butter
Cockle
Gaper
Littleneck
Softshell
332
254
250
163
250
Regulation change
effectiveJanuary
January 1.1,1977
1977.
Regulation
changeininbag
baglimit;
limit; effective
-
100
-
783
78.3
-
-
100
-
-
-
-
-
-
14.7
14.8
14,8
16.3
-
-
-
-
75:6
756
80.5
805
76.6
766
76.8
768
72.9
729
-
-
-
-
-
-
547
547
-
-
-
-
300
300
240
-
-
132
-
-
116
100
28.5
285
9.5
-
-
Table
Annual summary
sumary of
of recreational
recreational interview
interviewdata;
data;Bridge
BridgeBed,
Bed,Yaquina
YaquinaBay.
Bay.
Table 7. Annual
1971
1975
1976
j977A
19771
1978
1979
1980
1981
1982
1983
1984
No. Diggers
No.
Diggers Sampled
Sampled 4,518
41,769
No.
Clams Sampled
Sampled
No. Clams
M,'
fl,,c,. Hours
I
7O
No.
Digger
6.769
88
694
29
29
414
2
36
357
AOQ
488
89
89
892
nfl
110
143
1,313
ISA
120
142
142
1,222
1.222
lCfl
160
342
2,838
3,773
2CA
354
149
1,609
'cM
154
202
1,543
07.4
274
1,383
Hours/trip
HOUTs/trip
Clams/trip
Clams/hour
7.9
1.2
14.3
11.7
11.7
1.4
7.9
5.8
1.2
10.0
8.1
0.8
9.2
10.9
1.1
8.6
7.7
1.0
11.0
11.0
10.7
1.0
10.8
10.4
31.0
48.3
20.7
19.6
70.9
9.5
24.7
69.7
4.5
22.4
76.2
1.4
18.3
18.3
70.4
11.3
44.7
49.1
6.1
48.3
48.3
3.4
-
1.5
9.2
6.2
-
Digger
(%)
Digger Origin (%)
Local
State
-
Non.;.state
Non-state
-
-
-
-
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
~shell
Clams/hour
8utter
Butter
Cockle
Gaper
Littleneck
Snftshell
Softshell
Size
Compo (x(x size)
Size Comp.
Butter
8utte
Cockle
Gaper
Li ttleneck
Littleneck
Softshell
No. Clams
Clams Measured
Measured
No.
8utter
Butter
Cockle
Gaper
1
--
-
Compo (%)
(%) other2
other2 Species Comp.
Butter
0.2
Cockle
79.4
Gaper
19.5
Littleneck
0.8
Softshell
-
.....
0'>
-
-
-
-
-
-
-
-
-
--
1985~6
1985
1986
1987
'Cc
265
207
207
1,765
2AA
304
120
1,363
ItO
153
110
960
ICA
160
1.4
7.6
5.6
1.4
7.2
5.2
1.5
8.5
5.8
1.3
11.4
8.9
1.5
8.7
6.0
32.2
67.8
45.5
49.7
4.7
34.3
62.8
2.9
25.8
72.5
1.7
32.7
64.5
2.7
13.2
5.8
11.2
62.4
7.4
-
-
4.3
14.4
65.1
2.6
4.4
2.8
83.6
5.3
-
191
-
-
-
-
-
-
-
0.8
0.8
45.4
0.6
24.6
72.1
2.3
0.2
72.2
24.6
24,6
1.4
1.1
0.2
7.9
89.6
0.4
1.7
1.4
94.8
2.1
0.8
15.7
81.0
1.7
1.9
7.2
.7.2
85.4
4.5
12.9
72.9
2.8
7.8
2.4
5.2
80.1
4.5
-
-
-
-
-
-
-
-
-
-
-
-
-
<0.1
7.3
1.8
<0.1
<0.1
3.3
4.3
0.2
<0.1
10.3
<0.1
<0.1
2.5
7.2
0.1
<0.1
0.7
8.2
0.1
<0.1
<0.1
<0.1.
8.2
0.2
0.1
1.7
8.9
0.2
0.2
0.8
9.2
0.5
0.3
1.0
5.6
0.2
0.2
0.4
5.8
0.3
0.5
1.0
5.3
0.6
0.5
1.6
7.4
0.3
0.4
0.6
7.3
0.5
-
-
-
-
-
-
-
-
-
-
-
-
0.1
2.0
5.9
<0.1
0.9
9.8
0.1
0.1
7.3
0.1
0.2
.0.8
0.8
8.9
-
-
0.1
0.3
4.2
0.2
0.3
0.6
3.6
0.4
0.4
1.3
5.8
0.2
0.3
0.2
5.0
0.3
-
-
-
0.2
0.7
4.1
0.2
-
-
-
-
-
81.0
56.4
85.4
60.7
105.2
57.1
-
42.1
54.8
-
<0.1
--
-
<0.1
8.4
.8.4
2.9
-
,.
-
4.9
1.2
:1.2
.
3.5
0.2
--
-
43.6
1.4
3.66
3..
3.5
0.1
<0.1
2.6
2.5
-
-
-
-
46.7
115.5
57.5
95.0
-
49.3
107.1
60.3
-
-
-
-
-
60.5
-
-
-
--
-
-
--
--
276
316
-
--
-
-
-
-
-
-
-
-
-
-
69.9
101.7
-
-
67.5
66.8
96.8
51.5
.51.5
71.9
55.8
100.0
62.2
72.5
57.4
107.7
54.7
80.4
65.1
105.9
54.7
14.0
74.0
66.9
104.6
52.4
78.9
73.2
105.6
55.9
108.9
64.0
84.1
64.4
106.3
62.3
-
-
-
-
-
-
-
-
-
-
35
138
406
34
12
41
200
24
23
67
266
49
22
57
57
362
18
-
-
-
-
-
-
-
205
62
62
592
593
593
-
202
154
Li tt leneck
12
Littleneck
-Softshell
-Regulation
Regulation change
changeininbag
baglimit;
limit; effective
effectiveJanuary
January 1.1.1977.
1977.
22 Bentnose
0.2%. other
other 0.6%.
0.6%.
Bentnose 7.0%.
7.0%, Inquinata
Inquinata 0.2%,
-
1.1
8.6
-
3.2
-
51
279
279
22
14
6
419
419
19
1,370
55
5
S
86
308
9
9
-
-
-
-
-
20
536
29
7
7
135
135
26
-
Table8~
table 8
surinary of
of recreational
Annual summary
recreatrnnal interview data
data; Breakwater,Bed,
Breakwater Bed Yaquina Bay
Bay.
1971
No. Diggers
Diggers Sampled
Sampled 1,455
No.
No. Clams
Clams Sampled
Sampled
22,175
No.
No. Digger
Digger Hours
Hours
2.179
No.
2179
Hours/trip
Clams/trip
Clams/hour
1975-19771
19771
1975
1978
1978
1979
1980
1981
1981
1982
1982
1983
1983
1984
1985
1986
1987
17
46
46
515
515
--
48
511
511
69
20
20
270
270
22
22
10
10
142
20
20
21
21
261
44
16
16
166
27
27
14
157
157
21
21
190
190
24
24
63
63
654
103
103
39
39
489
489
31
31
303
34
65
65
125
105
1.5
15.2
10.2
11.2
1.4
10.6
2.0
14.2
7.1
2.1
12.4
5.9
1.7
10.4
6.1
.5
1.5
1.2
11.2
.7
7.7
1.4
11.2
7.9
1.6
10.4
6.4
1.3
12.5
7.4
1.1
13.5
12.6
1.1
9.8
8.9
1.6
14.2
8.9
-
-
35.4
64.6
55.0
45.0
30.0
-
-
28.6
71.4
71.4
28.6
52.9
47.1
-
-
-
30.2
66.7
56.7
3.2
61.5
33.3
5.1
32.3
67.7
-
18.8
50.0
31.3
55.4
41.5
3.1
-
2.9
3.7
4.1
87.5
1.8
7.3
3.6
3.5
82.8
5.9
3.0
19.0
73.4
4.5
51
51
9.7
Digger
(%)
Digger Origin ('A)
local
Local
State
Non-state
.....
.....,
-
-
Species
Compo ('A)
(%) other
other22 Species Comp.
Butter
1.2
15.3
Cockle
83,0
Gaper·
Gaper
83O
Littleneck
0.4
Softshell
-
-
-
-
1.5
3.9
95.0
0.2
1.4
18.2
78.9
7.0
84.5
0.8
0.7
13.7
13.7
84.4
0.4
-
-
-
Clams/trip
Butter
Cockle
<0.1
0.1
1.9
0.1
1.8
1.0
0.1
0.1
-
-
0.2
2.3
12.7
Littleneck
Softshell
<0.1
0.4
10.6
<0.1
-
-
Clams/hour
8utter
Butter
Cockle
Gaper
Littleneck
Softshell
0.1
1.6
8.4
<0.1
Gaper
Size Comp.
Compo (x
Size
(x size)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
-
<0.1
75.6
113.8
-
-
-
-
1.8
-
6.5
11.1
81.2
1.1
19.9
75.3
1.2
1.2
2.5
1.9
1.9
94.9
0.6
8.4
85.8
0.5
15.9
5.8
4.0
71.6
2.8
-
-
-
-
-
-
-
-
-
0.8
1.4
10.1
0.1
0.2
2.1
7.8
0.1
0.3
0.2
10.6
0.1
0.1
0.9
9.6
0.1
0.
.1
0.6
0.4
7.4
0.3
0.5
0.5
11.0
0.2
0.7
0.4
8.1
0.6
0.4
2.7
10.4
0.6
0.5
-
-
-
-
-
-
-
-
0.4
0.6
0.5
4.8
0.1
0.1
1.2
4.6
0.1
0.2
0.1
7.3
<0.1
0.1
0.7
6.8
5.8
<0.1
0.4
0.3
4.6
0.2
0.4
0.4
8.5
0.2
0.6
0.3
7.4
7,4
0.5
0.3
1.7
6.5
0.4
-
-
-
-
-
-
-
-
97.0
81.6
100.7
51.0
82.3
82:3
70.1
96.3
52.0
78.2
69.6
59.6
104.7
55.6
55.5
80.0
67.2
88.8
65.5
108.9
56.6
111.8
59.9
-
-
-
-
-
36
35
32
200
20
14
16
265
22
22
11
176
8B
IB
18
20
129
162
33
-
-
-
-
-
-
5.8
0.1
0.1
1.7
10.6
10.5
0.1
-
-
-
0.1
72.5
123.3
<0.1
76.1
118.9
<0.1
-
-
-
-
-
-
116.2
0.1
1.3
1.3
-
-
-
0.5
6.0
-
85.3
-
-
109.1
64.0
106.4
106.4
-
.-
-
-
-
No
No.
~
2
Clams
Measured
Clams Measured
Butter
Cockle
--79
37
37
310
198
207
Gaper
310
207
Littleneck
Littl eneck
Softshell
Softsheli
-- I~egul
afTon charlge
mi t; effective
-effect i veJanuary
January 1,
1,1977
1977.
Regulation
changefninbag
bag1ilimit;
-
62.6
-
1.1
Bentnose
C1 am.
Bentnose Clam.
16
15
-
4
11
-
27
69
3
142
12
109
3
3
-
11
11
15
195
-
-
-
Table
9. Annual
summary of
of recreational
recreational interview
interview data;
data; Idaho
Idaho Point,
Point. Yaquina
Yaquina Bay
Bay.
Annual sumary
Table 9.
1971
1971
1975
1975
1976
1976
1977A
19771
1978
1978
1979
1979
1980
1980
1981
1981
1982
1982
- 1983
1983
No.
No. Di9gersSampied
Diggers Sampled 10,462
10,462
No. Clams
Clams Sampled
Sampled 138,784
No.
138,784
No.
Digger Hours
Hours
15.621
No. Diqqer
15.621
123
123
2,600
2600
42
42
812
812
77
77
309
309
3,773
3,773
464
464
20
20
298
298
25
25
193
193
2,783
2,783
248
248
182
182
3,118
3,118
302
302
147
147
2,339
2,339
222
222
80
80
1,219
1,219
145
145
138
138
2,171
2,171
219
219
52
52
890
890
83
83
403
403
42
42
47
47
849
849
77
77
47
47
741
741
52
52
1.8
1.8
19.3
19.3
in
10.6
1.5
1.5
12.2
12.2
A I
8.1
1.3
1.3
14.9
14.9
ii
A
11.8
1.3
1.3
14.4
14.4
ii
11.22
1.7
1.7
17.1
17.1
in
10.3
1.5
1.5
15.9
15.9
in c
10.5
1.8
1.8
15.2
15.2
8.44
1.6
1.6
15.7
15.7
Q n
9.9
1.6
1.6
17.1
17.1
in i
10.7
1.6
1.6
15.5
15.5
0 R
9.6
1.6
1.6
18.1
18.1
Ii C
11.0
15.8
15.8
it a
14.4
35.7
35,7
33,3
33.3
31.0
31.0
12.3
12.3
84.1
84.1
3.6
3.6
45.0
45.0
50.0
50.0
5.0
5.0
31.6
31.6
62.7
62.7
5.7
5.7
28.6
28.6
65.4
65.4
6.0
6.0
15.6
15.6
70.7
70.7
13.6
13.6
18.8
18.8
81.3
81.3
9.4
9.4
85.5
85.5
21.2
21.2
76.9
76.9
1.9
1.9
50.0
50.0
42.3
42.3
7.7
7.7
21.3
21.3
72.3
72.3
6.4
6.4
38.3
38.3
38.3
38.3
23.4
23.4
-
-
Hoursltrip
Hours/trip
Clams/trip
Clams/trip
riamc;hn,ar
Clams/hour
(%)
Di9ger Origin
Ori9in(7.)
Digger
Local
Local
State
State
Non-state
Non-state
1.5
1.5
13.3
13.3
R 0
8.9
---
-
2 -other2
Species
(%) other
Species Compo
Comp. (%)
8utter
.03
Butter
.03
Cockle
77.7
Cockle
77.7
Gaper
21.7
Gaper
21.7
Littleneck
0.4
littleneck
0.4
Softshell
S.2ftshell
Clams/trip
Clams/trip
.....
00
Butter
Butter
Cockle
Cockle
Gaper
Gaper
Li
Littleneck
ttleneck
Softshell
--2!!ftshe11
Clams/hour
Clams/hour
Butter
Butter
Cockle
Cockle
Gaper
Littleneck
Softshell
Softshell
SizeComp.
(x size)
Size Comp. (x
Butter
Butter
Cockle
Cockle
Gaper
Gaper
Littleneck
Li ttleneck
Softshell
No.
No. Clams
Clams Measured
Neasured
Butter
Cockle
Cockle
Gaper
Gaper
Li
ttleneck
Littleneck
1
Softshell
Softshell
21.1
21.1
-
-
---
<0.1
<0.1
93.2
93.2
5.8
5.8
<0.1
<0.1
-
0.5
0.5
72.5
72.5
18.4
18.4
0.1
0.1
-
<0.1
<0.1
19.7
19.7
1.2
1.2
<0.1
<0.1
0.1
0.1
14.0
14.0
3.6
3.6
<0.1
<0.1
-
-
-
0.1
0.1
-
6.9
6.9
-
-
0.1
0.1
7.7
7.7
-
-
61.0
61.0
113.0
113.0
-
-
-
--
-
2.0
2.0
<0.1
<0.1
-
-
-
-
58.6
58.6
96.6
96.6
-
-
-
83,9
83.9
15.1
15.1
-
-
58.3
58.3
91,3
91.3
-
-
-
--
-
-
0.1
0.1
9.6
9.6
1.6
1.6
<0.1
<0.1
--
12.5
12.5
2.3
2.3
-
-
87.2
87.2
12.8
12.8
0.2
0.2
10.1
10.1
3.0
3.0
<0.1
<0.1
14.9
14.9
2.2
2.2
-
-
-
0.1
0.1
93.4
93,4
4.1
4.1
0.5
0.5
95.0
-
95.0
2.9
2.9
0.9
0.9
5.1
5.1
-
0.4
0.4
85.5
85.5
2.8
2.8
0.7
0.7
0.4
0.4
0.6
0.6
97.1
97.1
1.6
1.6
0.3
0.3
1.1
1.1
-
-
--
93.9
93.9
5.4
5.4
0.7
0.7
99.3
99.3
0.1
0.1
0.5
0.5
15.3
15.3
17.0
17.0
1.0
1.0
15.7
15.7
-
0.2
0.2
0.1
0.1
0.1
0.1
-
10.4
10.4
0.6
0.6
0.1
0.1
14.3
14.3
99.0
99.0
1.0
1.0
-
-
14.9
14.9
0.6
0.6
<0.1
<0.1
-
14.5
14.5
0.4
0.4
<0.1
<0.1
0.1
0.1
6.4
6.4
1.1
1.1
<0.1
<0.1
-
60.2
60.2
93.5
93.5
--
-
9.9
9.9
1.8
1.8
-
1.3
1.3
9.0
9.0
9.8
9.8
0.1
0.1
<0.1
<0.1
-
-
-
-
-
57.8
57.8
94.5
94.5
-
75.1
75.1
58.2
58.2
95.9
95.9
55.3
55.3
-
-
-
-
-
-
8.0
8.0
0.2
0.2
0.1
0.1
0.1
0.1
16.6
16,6
0.3
0.3
0.1
0.1
-
<0.1
<0.1
8.5
8.5
0.3
0.3
0.1
0.1
0.1
0.1
10.4
10.4
0.2
0.2
<0.1
<0.1
-
-
-
--
54.4
54.4
83;3
833
42.7
42.7
52.6
52.6
89.1
89.1
42.6
42.6
-
-
-
-
-
1,620
1,620
-
.-
-
-
-
369
369
171
171
522
522
126
126
1,804
1,804
173
173
250
250
42
42
45
45
1,471
1,471
24
24
-
-
-
-
-
-
0.1
0.1
87.3
87.3
54.3
54.3
91.7
91.7
50.1
50.1
-
-
-
0.2
0.2
7.9
7.9
2.3
2.3
-
59.0
59.0
95.2
95.2
0.1
0.1
13.5
13.5
0.4
0.4
-
-
-
-
-
-
-
-
Regulation
change Ti1--bag
1illlif;---effective--JanuarY·--l.
1977.
Regulation change
in bag limit;
effective January 1, 1977.
22 Bentnose
clam.
Bentnose clam.
-
..
1.7
1.7
70.2
70.2
20.7
20.7
0.1
0.1
----
26
26
-
<0.1
<0.1
10.3
10.3
2.9
2.9
<0.1
<0.1
1.9
1.9
<0.1
<0.1
-
0.5
0.5
78.5
78.5
13.1
13.1
0.2
0.2
--
19a:r----1985-----r9M-1987
1985
1986
1984
1987
-
-
181
181
-
-
44
1,302
1,302
75
75
9
9
--
-
-
-
85.8
85.8
52.3
52.3
-
9.5
9.5
--
0.1
0.1
-
-
-
-
42.8
42.8
-
-
L
-
-
55
240
240
377
377
-
-
-
45.7
45.7
44.0
44,0
540
540
40
40
55
0.1
0.1
56.7
56.7
94.2
94.2
42.0
42.0
-
44
4
-
-
-
4
-
-
-
56.8
56.8
-
477
477
55
22
-
41.3
41.3
142
142
-
33
Northwest
Table 10.
10. Annual suninary
summary of recreational
recreationalinterview
interviewdata;
data;
NorthwestGas
GasPlant,
Plant,Yaquina
Yaquina Bay.
Bay.
1971
1975
1976
19771
1977S
1978
1979
1980
1981
1982
1983
1983
1984
1985
1986
1986
1987
No.
No. Diggers
Diggers Sampled
Sampled 5,857
Clams Sampled
Sampled 119,702
No. Clams
No.
No. DiQqer
Di'ger Hours
Hours
8,725
92
93
583
139
315
3,852
402
49
684
67
137
13,541
-
1,073
1,073
38
151
54
29
29
128
33
23
23
219
25
25
9
9
136
13
26
319
319
33
57
1,125
1,107
165
63
495
84
84
71
75
-
1.3
12.2
9.6
1.4
14.0
10.2
1.2
7.8
6.5
1.3
7.9
5.9
1.4
4.0
2.8
4.4
4,4
3.9
1.1
-
1.5
17.0
11.4
9.5
8.8
1.4
15.1
10.5
1.3
12.3
9.7
1.2
19.7
15.8
1.1
16.8
14.9
--
9.7
86.0
4.3
22.5
72.1
5.4
59.2
38.8
2.0
33.6
49.6
16.8
30.2
68.3
1.5
36.8
57.9
5.3
65.5
34.5
34.8
65.2
50.0
50.0
-
-
44.4
33.3
22.2
--
47.4
38.6
14.0
25.8
59.1
15.2
2.2
4.7
-
-
Hours/trip
Clams/tri
Clams/tripp
Clams/hour
Clams/hour.
Digger Origin (%)
(%)
Digger
Local
State
Non-state
1.5
20.4
13.7
13.7
--
-
Compo (%)
(%) other
Species Comp.
other22 Butter
0.6
Cockle
85.1
Gaper
12.7
Littleneck
0.7
50ftshell
Softshell
-
.....
""
'.0
-
14.7
-
-
-
-
-
-
-
1.9
60.6
29.8
1.3
0.1
71.3
22.0
0.3
-
-
1.1
74.5
13.8
0.5
-
--
-
-
11.9
0.6
-
-
0.6
78.4
19.6
1.4
-
-
<0.1
6.4
0.9
<0.1
0.1
6.2
1.5
0.1
-
0.1
17.4
2.6
0.1
0.3
8.9
4.4
0.2
<0.1
12.1
3.7
<0.1
0.1
9.1
1.7
0.1
-
-
-
-
<0.1
11.5
2.3
0.1
-
-
Clams/hour
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
<0.1
11.7
1.7
<0.1
0.1
7.1
1.3
0.1
<0.1
-
<0.1
8.1
2.5
<0.1
-
-
-
-
Size
(x size)
Size: .Comp.
~()l'I1p •... (xsi
ze)
Butter
Cockl.
Cockle
Gaper
Littleneck
Softshell
-
-
--
--
-
.-
66.3
95.3
63.4
91.3
-
-
-
-
-
-
-
-
-
-
56.5
91.5
---
-
-
8.5
1.7
<0.1
--
-
60.7
92.8
60.0
101.1
-
-
-
-
-
-
-
0.2
81.9
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
-
--
0.1
82.6
16.8
0.4
-
-
-
--
-
-
<0.1
5.3
0.8
<0.1
<0.1
4.6
1.2
1.2
0.1
-
-
-
-
-
-
99.0
52.5
96.0
47.4
-
-
606
96
.96
11
349
61
.61
5
5
-
-
-
59.4
94.9
-
-
2.0
11.3
34.4
2.0
47.0
0.1
1.1
-
-
91.4
7.0
1.6
-
--
-
1.8
0.5
84.0
94.9
-
-
-
13.7
-
0.4
4.0
1.4
0.1
I.g
1.9
0.3
0.1
<0.1
8.0
1.3
-
-
-
-
66
-
92.2
0.3
2.8
95.9
96.8
3.0
2.9
-
-
-
-
14.3
11.3
18.9
16.2
2.9
-
-
-
-
-
0.4
0.3
0.6
0.5
-
-
-
-
-
-
9.9
8.9
15.2
14.4
0.1
0.3
1.0
0.1
1.3
1.3
3.6
0.3
0.1
1.2
0.3
0.3
0.5
0.4
-
-
-
-
-
-
80.0
47.1
86.8
88.8
48.0
57.5
50.2
87.3
45.5
56.6
--
54.5
33.0
48.6
56.5
50.1
51.3
43.6
-
-
11
18
46
22
22
60
77
-
-
<0.1
-
7.4
-
97.0
57.0
96.5
45.8
-
-
-
No.
No. Clams
Clams Measured
Measured
Butter
-648
Cockle
219
889
525
Gaper
451
217
-152
106
106
littleneck
Littleneck
--Softshell
50ftshell
-1
£
Regulation
effective January
January 1,
1, 1977.
1977.
Regulation change
changeininbag
baglimit;
limit; effective
22 Bentnose
Bentnose clam.
-
-
-
-
11
177
8
8
30
-
-
-
122
-
--
293
11
9
9
-
408
431
431
15
15
23
-
Table
11. Annual
Annual summary
intervi~w data;
data; Coquille
CoquillePoint,
Point,Yaquina
YaquinaBay.
Bay.
sunriaryofof recreational
recreational interview
Table 11.
No.
Di9gers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
n..,.u.,......
No. Digger-Hours
.J...
Hours/trip
Clams/trip
Clams/hour
1981
1981
1982
1983
1983
11
11
24
24
9C
53
267
267
IC
75
27
27
147
22
33
0.8
2.2
2.7
1.4
i.4
5.0
3.6
5.4
4.5
-
100.0
-
75.5
75,5
15.1
25.9
55.6
18.5
--
4.2
3.0
-
40.1
34.7
3.0
15.7
8.2
-
-
-
0.1
0.2
1.2
Digger
(%)
Digger Origin (%)
local
Local
State
Non-state
Species Comp.
Compo (%)
(%)
8utter
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
N
0
C
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
~shell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Compo (x
Size Comp.
(x size)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
No.
No. Clams
Clams Measured
Measured
Butter
Cockle
Gaper
li ttleneck
Littleneck
Softshell
9.4
95.8
-
93.3
-
-
4.7
0.2
2.2
1.9
0.9
0.4
-
-
-
0.1
0.1
-
-
2.1
-
-
--
1985
1965
1986
1987
1987
77
45
6
13
13
28
99
22
20
287
9C
25
0.8
6.4
8.2
1.7
2.2
1.3
1.2
14.3
11.5
57.1
-
46.2
23.1
30.8
35.0
35.0
30.0
-
60.0
17.8
7.1
42.9
15.3
41.5
36.2
2.1
0.7
-
3.9
1984
--
-
-
-
-
-
-
22.2
35.7
-
-
-
1.1
-
0.2
0.9
-
-
1.4
0.8
-
-
-
4.9
1.5
-
-
-
-
0.1
0.5
1.8
0.5
-
-
-
-
42.9
-
-
-
2.2
6.0
5.2
0.3
0.1
-
0.1
1.8
1.6
0.7
0.4
-
-
-
88.0
93.6
-
-
-
80.4
38.6
80.0
37.5
96.6
61.3
74.9
47.2
98.9
45.9
-
-
-
41.9
41.8
41.0
-
-
-
-
-
-
-
11
5
-
-
27
27
9
9
2
2
12
12
39
39
75
75
10
10
10
11
55
-
-
2.6
-
94.5
-
3.3
-
-
23
-
142
44
22
51
15
15
12
12
-
-
-
-
-
--
-
-
-
-
-
1.8
4.8
4.2
0.2
0.1
77 .7
77.7
-
-
12.
Table 12
Annual
Island, Yaquina
Bay.
Annual summary
suimiaryofofrecreational
recreational interview'data;
interview data Critser's
Critser s Island
Yaquina Bay
No.
Di ggersSampled
Sampled
No. Diggers
No.
Clams Sarñpled
Sampled
No. Clams
No.
No. Digger,Hours
Diqer Hours
Hours/frip
Hours/trip
Clams/trip
Clams/hour
1983
1984
1985
1986
1987
42
1,380
56
14
14
491
24
11
377
15
29
29
906
53
53
12
297
17
1.3
32.9
24.6
1.7
35.1
20.9
1.4
34.3
25.1
1.8
31.2
17.3
1.4
24.8
18.0
40.5
59.5
50.0
50.0
-
48.3
51.7
100.0
-
81.8
18.2
18,2
-
-
-
-
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
-
-
-
-
-
-
-
-
35.1
-
-
34.3
31.2
24.8
-
-
20.9
25.1
17.3
18.0
-
-
-
-
-
-
82.5
93.3
93.1
85.4
94.5
-
-
-
-
-
569
68
68
280
Digger
Origin (%)
(%)
Digger Origin
Local
local
State
Non-state
-
-
Camp. (%)
(%)
Species Comp.
Butter
Cockle
Gaper
Littleneck
Soffshell
Softshell
N
.....
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
Size Comp.
Camp. Cx
ex size}
size)
Butter
Cockle
~aper
Gaper
Littleneck
Softshell
No.
Clams Measured
Measured
No. Clams
Butter
Cockle
Gaper
Littleneck
Softshell
32.9
24.6
-
-
-
-
-
-
-
-
306
-
-
-
-
138
13.
Table 13.
Annual
of ofrecreational
North Bank
Bank Softshell,
Softshell.Yaquina
Yaquina Bay.
Bay.
Annual summary
sununary
recreational interview
interview data; North
1984
1985
1986
1986
1987
26
971
25
27
27
698
698
27
27
10
156
20
25
25
709
35
Hours/trip
Clams/trip
Clamslhour
Clams/hour
0.9
37.4
39.6
1.0
25.9
25.9
2.0
15.6
15.6
7.8
1.4
28.4
20.3
(%)
Digger Origin (7.)
Digger
Local
State
Non-state
84.6
15.4
51.9
33.3
14.8
No. Diggers
Diggers Sampled
Sampled
No.
No. Clams
Clams sampled
Sampled
No.
No. Digger
Digger Hours
Hours
No.
Species
Camp. (%)
(%)
species Camp.
Butter
Cockle
N
N
N)
Clams/trip
Butter
Cockle
Gaper
Littleneck
littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size Camp.
Compo (x
Cx size)
size)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
-
40.0
60.0
-
-
-
-
-
-
-
100.0
99.9
100.0
100.0
-
-
37.4
39.6
25.8
-
25.8
2S.8
74.6
No.
Clams Measured
Measured
No. Clams
Butter
Cockle
Gaper
Littleneck
SoHshell
Softshell
-
-
Gaper
Littleneck
Softshe11
Softshell
100.0
240
-
-
15.6
28.4
7.8
20.3
-
-
-
-
63.6
83.5
-
-
366
63
65.6
-
104
104
14/Annual
data; North
NorthShore,
Shore, Alsea
Alsea Bay
Bay.
Table 14.
AnnUalsummary
sunnaryofofrecreational
recreational interview data;
1982
1982
No. Diggers
Diggers-Sampled
No.
Sampled
No.
Sampled
No. Clams
Clam~_$aIllPled
No. Digger'
Di9ger.--Hours
No.
Hours
Hours/trip
Clams/tri p
Clams/trip
Clams/hour
(%)
0;9ger
Digger Origin (%)
Local
State
Non~state
Non-state
SpeciesComp.
(%)
Species Comp. (%)
Butter
Cockle
Gaper
Littleneck
Softshell
N
w
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size
size)
Size Camp.
Comp.(x(xsize)
Butter
Cockle
Gaper
Littleneck
Softshell
No. Clams
Clams Measured
Measured
No.
Butter
Cockle
Gaper
Littleneck
Softshell
1983
1984
1985
1986
1987
-
--
329
.329
4
4
33
71
.-
.-
66
22
22
5
1.5
17.8
17.8
11.8
11.8
1.5
7.3
4.9
-
-
--
-
-
-
-
-
-
-
-
100.0
-
-
-
-
-
-
-
100.0
90.9
-
100.0
-
-
-
--
-
-
17.8
-
4.6
4.6
-
-
-
-,
-
-
-
-
-
--
-
6.7
--
0.3
0.3
11.8
4.4
-
-
-
--
0,2
02
-
--
39.0
58.0
-
20
-
-,
-
-
-
-.
39
-
-
-
-
71.0
-
.
-
-
-
0.2
-
-
-
-
80.1
24
24
1.2
16.4
13.7
90.0
10.0
-,
-
---
---
----
--
-
20
20
..
-
-
--
-
-
--
-
-
-
-
-
-
-
-
--
-
-
-
-
-
-
15.4
0.9
0.1
-
12.9
0.8
-,
-,
-
-
93.9
5.8
0.3
-
----
76.5
116.7
169
169
19
-
15.
Table 15.
Annual
interviewdata;
data;Bayshore,
Bayshore, Alsea
Alsea Bay
Bay.
Annual summary
suniiaryofof recreational
recreational interview
No.
Diggers Sampled
Sampled
No. Diggers
No.
CJ~m$ Sampled
sampled
No. Clams
No.
[)lager Hours
Hours
No. Diaper
Hours/tri
Hours/tripp
Clams/trip
Clams/hour
(%)
Digger Origin (10
Digger
Local
State
Non-state
Compo (%)
Specie$
Species Comp.
(7.)
Butter
Cockle
Gaper
Littleneck
Softshe11
Softshell
..,.a
N
Clams/trip
Butter
Cockle
Gaper
Littl eneck
Littleneck
1982
1983
1983
1984
1985
1986
1987
32
32
529
529
46
24
24
316
40
17
17
156
29
35
478
61
9
138
18
20
314
27
1.4
16.5
11.5
1.7
1'3.2
13.2
8.0
1.7
9.2
5.5
1.7
13.7
7.9
2.0
15.3
7.7
1.4
15.7
11.6
59.4
25.0
15.6
66.7
25.0
8.3
41.2
58.8
48.6
45.7
5.7
66.7
33.3
-
35.0
50.0
15.0
99.8
0.2
99.7
88.9
2.9
0.4
7.5
94.2
5.1
0.7
90.4
8.6
1.0
-
Gaper
Littleneck
Soft shell
Softshell
Si.ze
Compo (x(x $ize)
Size Comp.
size)
Butter
Cockle
Gaper
Littleneck
Softshell
S£ill!:!e11
98.7
1.3
-
16.5
<0.1
Softshell
Clams/hour
Butter
Cockle
-
11.5
<0.1
0.3
13.1
<0.1
8.0
--
-
<0.1
72.9
76.4
-
-
-
-
-
9.1
0.1
-
12.1
0.4
0.1
1.0
5.4
0.1
7.0
0.2
-
14.4
0.8
0.1
14.2
1.4
0.1
7.2
0.4
0.1
10.5
1.0
73.8
130.9
44.0
74.8
121.
121.77
49.0
69.8
85.5
48.0
-
-
-
-
0.6
76.3
116.0
-
-
No. Clams
Clams Measured
Measured
No.
8utter
Butter
Cockle
159
159
295
-
-
Gaper
Littleneck
Softshell
154
22
331
10
22
-
-
109
66
1
1
-
180
24
3
3
-
Table
Table 16.
16~
N
(J1
U'
Annual
interviewdata;
data;Breakwater,
Breakwater, Alsea
Alsea Bay.
Bay.
Annual surrmary
sumary of
of recreational interview
1986
1987
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No.
Oiqqe'r Hours
Hours
No. Digget
23
122
25
144
144
24
Hours/trip
Clams/trip
Clams/hour
1.1
5.3
5.0
1.7
10.3
6.0
Digger
(%)
Digger Origin (%)
local
Local
State
Non-state
Non"state
47.8
52.2
28.6
50.0
21.4
Species Comp.
Compo (%)
(%)
Butter
Cockle
Gaper
Littleneck
Softshell
-
-
89.3
10.7
81.9
13.9
4.2
-
-
4.7
0.6
8.4
1.4
0.4
-
-
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
Size
Size Comp.
Compo (x
(x size)
Butter
Cockle
Gaper
Littleneck
Softshell
--
-
14
14
-
-
-
4.4
4.9
0.8
0.2
-
0.5
-
-
47.0
47,0
64.1
-
45.1
45.4
120.8
45.8
-
-
-
-
-
No. Clams
Clams Measured
Measured
No.
Butter
Cockle
Gaper
Gapef
littleneck
Littleneck
Softshell
11
83
83
-
8
138
15
66
-
-
Table 17.
17.
Table
Annual
data; Softshell,
Softshell.Alsea
AlseaOay.
Bay.
Annualsummary
sumaryofof recreational
recreational interview data;
1983
1984
1985
1986
1987
1987
4
4
91
6
6
5
138
138
77
5
5
151
10
8
148
99
14
14
431
23
23
1.4
27.6
19.7
2.0
Clams/hour
1.5
22.8
15.2
30.2
15.1
1.1
18.5
16.4
1.6
30.8
19.2
Digger Origin
Origin (%)
(%)
Digger
local
Local
State
50.0
50.0
60.0
78.6
21.4
40.0
50.0
25.0
25.0
-
-
No.
0 ggers Sampled
Sampled
No. Diggers
No. Clams
Sampled
No.
C a~~$ampled
No.
No. Digger
o 9ger Hours
Hours
Hours/trip
Clams/trip
Non~state
Non-state
Camp. (%)
(%)
Speci
es Comp.
Species
Butter
Cockle
Gaper
Littleneck
Softshell
N
0>
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
100.0
80.0
20.0
100.0
100.0
-
100.0
-
100.0
-
..
22.8
27.6
30.2
18.5
30.8
15.2
-
-
-
-
19.7
19.7
15.1
16.4
19.2
96.8
94.6
95.0
97.1
94.0
Clams/hour
Butter
Cockle
Gaper
Littl
eneck
Littleneck
Softshell
Camp. Cx
(x size)
Size
Size Comp.
Butter
Cockle
Gaper
Littleneck
Softshell
No.
Clams Measured
Measured
Mo. Clams
Butter
Cockle
Gaper
Littleneck
Softshell
86
135
135
180
102
102
-
-
190
Table 18.
18.
Table
Siuslaw Bay
Annual
summary of
of recreational
recreational interview
interview data;
data; North
North Fork2,
Fork 2 , Siuslaw
Bay.
Annual sunnary
1971
1971
1976
1976
19771
1977A
1978
1978
1979
1979
1980
1980
1981
1981
1982
1982
1983
1983
1984
1984
1985
1985
1986
1986
1987
1987
No.
Sampled 3,203
No. Diggers
Diggers Sampled
3,203
No.
Sampled
72,756
No. Clams
Clams Sampled
72.756
No.
DiqQer Hours
Hours
4;844
No. Digger
4.844
39
39
1,067
1,067
54
54
51
51
1,426
1,426
101
101
21
21
670
670
32
32
42
42
1,140
1,140
55
55
77
188
188
5
5
115
115
21
21
875
875
28
28
33
33
1,163
1,163
32
32
168
168
3,445
3,445
145
145
5,418
5,418
70
70
2,297
2,297
104
104
47
47
1,704
1,704
65
65
42
42
1,453
1,453
67
67
1.4
1.4
27.4
27.4
19.8
20.
20.
28.0
28.0
14.1
1.5
1.5
31.9
31.9
21.3
1.3
1.3
27.1
27.1
0.7
0.7
26.9
26.9
1.0
1.0
35.2
35.2
36.3
1.6
1.6
34.6
34.6
24.7
1.5
1.5
32.8
32.8
22.2
1.4
1.4
36.3
36.3
37.6
1.3
1.3
41.7
41.7
31.3
34.0
34.0
20.6
1.3
1.3
30.0
30.0
23.7
26.4
21.7
28.8
28.8
66.7
66.7
4.4
4.4
28.6
28.6
71.4
71.4
28.6
28.6
71.4
71.4
51.5
51.5
42.4
42.4
9.1
9.1
27.4
27.4
67.3
67.3
5.4
5.4
70.0
70.0
12.9
12.9
34.0
34.0
61.7
61.7
4.3
4.3
35.7
35.7
64.3
64.3
-
38.3
38.3
48.7
48.7
13.0
13.0
47.6
47.6
52.4
52.4
-
19.0
19.0
47.6
47.6
33.3
33.3
17.1
17.1
-
12.8
12.8
84.6
84.6
2.6
2.6
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Gaper
-
-
-
-
Littleneck
Littleneäk
Softshell
Softshell
-
-
-
-
-
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
100.0
Clams/trip
Butter
Butter
-
-
-
-
-
Cockle
Cockle
-
-
-
-
-
-
-
-
-
Gaper
-
-
-
-
-
-
-
-
-
41.7
41.7
35.2
35.2
34.0
34.0
32.8
32.8
36.3
36.3
-
-
-
-
-
Hours/trip
Clams/trip
Clams/hour
Digger
(%)
Di9ger Origin
Ori9in('4)
Local
Local
5tate
State
Non-state
1.5
1.5
22.7
22.7
15.0
--
-
-
231
231
1.4
1.4
5pecies
(%)
Species Compo
Comp. (%)
Butter
Cockle
Cockle
N
N)
"
Littleneck
Softshell
Softshell
Clams/hour
Butter
Butter
Cockle
Cockle
Gaper
Gaper
Littleneck
Littleneck
Softshell
Softshell
Size Comp.
Comp~ Cx
(x size)
size)
Size
Butter
Butter
Cockle
Gaper
Gaper
littleneck
Littleneck
Softshell
Softshell
-
-
100.0
100.0
100.0
100.0
-
-
-
100.0
100.0
100.0
100.0
-
-
-
-
28.0
28.0
31.9
31.9
27.1
27.1
26.9
26.9
30.0
30.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
15.0
15.0
19.8
19.8
14.1
14.1
21.3
21.3
20.6
20.6
37.6
37.6
23.7
23.7
31.3
31.3
36.3
36.3
24.7
24.7
22.2
22.2
26.4
26.4
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
107
;4
107.4
96.5
96.5
99.0
99.0
89.5
89.5
90.0
90.0
89.4
89.4
90.7
90.7
92.8
92.8
95.0
95.0
99.2
99.2
96.1
96.1
97.8
97.8
-
-
-
-
-
22.7
22.7
27.4
27.4
-
-
-
-
-
-
-
No. Clams
Measured
No.
Clams Measured
Butter
Butter
Cockle
Cockle
Gaper
Gaper
Littleneck
Li ttleneck
Softshell
Softshell
741
741
408
408
335
335
676
676
757
757
867
867
110
1.629
110
1.629
1 Regulation
1. 1977.
1977.
Regulation change
change in
in bag
bag limit;
limit; effective.January
effectiveJanuary 1,
2 Includes
2
Includes digging
digging on
side, east
side and
and in
in North
North Fork
Fork of
of Siuslaw
Siuslaw and
and near
near Florence
Florence.
on west
west side,
east side
-
34.6
34.6
-
21.7
21.7
-
-
-
-
-
-
-
297
297
670
670
670
670
585
~8~
Table 19.
19.
Table
Annual
Annual summary
suinnaryofofrecreational
recreational interview
interview data;
data;Bolin
BolinIsland,
Island.
Umpqua
Umpqua Bay.
Bay.
1983
No. Diggers
No.
Diggers Sampled
Sampled
No. Clams
No.
Clams Sampled
Sampled
No. DiqQerHours
fa....PIQQerHours
Hours/trip
Clams/trip
Clams/hour
Cl
amslhoui
Digger
(%)
Digger Origin (%)
Local
State
Non-state
Species Comp.
Camp. (%)
(%)
Butter
Cockle
Gaper
Littleneck
Softshe11
Softshell
N
CO
00
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
Size
Compo (x
Size Comp.
(x size)
size)
Butter
Cockle
Gaper
Littleneck
Softshell
No.
Clams Measured
Measured
No Clams
Butter
Cockle
Gaper
Littleneck
Softshell
1984
1985
1986
1987
19B7
-
-
-
-
22
23
72
4
4
930
69
-
2.0
36.0
3.0
40.4
13.6
-
18.0
18.0
-
100.0
30;4
30.4
56.5
13.0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
100.0
36.0
100.0
-
-
-
-
-
-
-
-
-
-
-
40.4
18.0
-
-
13.6
-
-
-
-
-
-
-
-
-
-
-
20.
Table 20.
Arnual
interviewdata;
,data;Hanson's
Hanson'sMarina
Marina - -South
SouthSlough,
Slough.Coos
Coos Bay.
Bay.
Annual summary
sunmiaryofofrecreational
recreational interview
No. Diggers
Diggers Sampled
Sampled
No.
No.
Clams Sampled
Sampled
No. Clams
No.
Digger'Houts
No. Dimoer
Hours
Hours/trip
Clams/trip
Clams/hour
Digger
Digger Origin (%)
(%)
Local
State
Non-state
1983
1984
1985
66
101
101
55
-
-
0.8
16.8
22.4
-
-
1986
1987
1987
-
11
18
11
-
-
-
-
1.0
18.0
18.0
100.0
-
-
-
100.0
-
-
-
-
-
-
-
-
-
4.0
19.8
69.3
1.2
-
--
-
-
-
44.4
55.6
-
-
-
-
-
-
-
-
0.7
3.3
11.7
1.2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Species Comp.
Compo ('A)
(%)
Species
Butter
Cockle
Gaper
Littleneck
Softshell
N
to
<.0
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
0.9
Cockle
4.4
Gaper
15.6
1.6
Littleneck
Littleneok
Softshell
--
-
-
Butter
-
Cockle
Cockle
-
-
-
-
-
-
-
-
-
8.0
10.0
-
-
8.0
10.0
-
-
-
-
-
-
-
-
-
Camp. (x
Size
Size Comp.
(x size)1
Butter
Cockle
Gaper
Littl
Littleneck
eneck
Softshell
No. Clams
Clams Measured'
Measured 1
No.
Gaper
I
Littleneck
Softshell
Not taken.
Not
-
-
-
-
-
-
-
-
Table
Table 21.
21.
Annual
interviewdata;
data;Charleston
CharlestonTriangle,
Triangle,Coos
Coos Bay.
Bay.
Annual summary
sunnaryofof recreational
recreational interview
1983
1984
1985
1986
1987
40
771
44
32
588
27
27
20
410
25
58
1,193
75
91
91
1,647
105
Hours/trip
Clams/trip
Clams/hour
1.1
19.3
17.5
0.8
18.4
22.0
1.2
20.5
16.7
1.3
20.6
16.0
1.2
18.1
15.7
Digger
(%)
Digger Ori9in
Origin ('4)
Local
State
22.5
72.5
:5Q
5.0
40.6
56.3
3.1
50.0
35.0
29.3
62.1
8.6
34.1
47.3
18.1
19.6
55.1
3.9
23.2
10.9
10.9
69.2
15.0
4.9
4,9
13.2
56.6
20.5
9.5
-
-
-
2.6
66.5
17.5
8.5
0.3
13.2
47.3
31.3
5.8
0.1
3.8
10.6
08
0.8
4.5
2.0
12.7
2.8
0.9
2.7
11.6
2.4
8.6
5.7
-
-
-
0.5
13.7
3.6
1.8
0.1
3.4
9.7
2.4
15.2
3.3
1.1
2.2
9.5
3.4
1.6
0.4
2.1
7.4
4.9
0.9
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No.
Hours
No. Digger Hours
Non-state
15.0
Compo (%)
(%)
Species Comp.
Butter
Cockle
Gaper
Littleneck
Softshell
w
0
C1 ams{tT'i p
Clams/trip
Butter
Cockle
Gaper
Li
ttleneck
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
0.7
4.1
--
4.2
1.9
-
10.6
2.8
1.4
0.1
1.1
-
-
Size Comp.
Compo (x
Cx size)
size)
Butter
Cockle
Gapl';!f
Gaper
Littleneck
Softshell
73.3
51.2
88.6
55.2
80.2
66.3
95.2
57.6
82.5
62.6
98.2
61.3
75.3
63.2
97.3
61.1
78.2
61.2
99.1
58.9
-
-
-
-
39
17
218
:218
54
54
159
52
185
67
41
41
15
175
30
51
118
298
187
64
64
-
-
-
-
No. Clams
Clams Neasured
Measured
No.
Butter
Cockle
45
Gaper
26
18
Li ttleneck
Littleneck
Softshell
-
Table 22.
22.
Table
Annual summary
data; Charleston
Charleston Flat,
Flat,Coos
Coos Bay.
Bay.
Annual
surmiaryofofrecreational
recreational interview data;
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No.
DlqqerHours
No. Digger
Hours
Hours/trip
Clams/trip
C1
aros/hour
Clams/hour
Digger
(%)
Digger Origin (%)
Local
State
NOf1~state
Non-state
Compo (%)
(%)
Species Comp.
Butter
Cockle
Gaper
Littleneck
Softshell
1983
1984
1985
1985
1986
1987
60
859
125
27
27
435
29
29
18
18
341
341
32
100
1,980
180
113
2,145
185
2.1
14.3
6.9
1.1
16.1
15.1
1.8
1.6
18.9
16.9
10.7
1.8
19.8
11.0
1.6
19.0
11.6
21.7
73.3
5.0
40.7
51.9
7.4
16.7
38.9
44.4
35.0
57.0
8.0
6.0
28.3
48.7
23.0
2.0
4.6
60.9
27.6
3.7
3.0
6.7
72.4
17 .3
17.3
3.5
2.8
83.3
8.8
4.1
0.1
2.7
63.9
26.2
4.7
-
1.3
13.7
3.3
0.7
0.6
16.5
1.8
0.8
<0.1
0.5
12.1
5.0
0.9
-
0.7
9.8
4.4
0.6
0.5
0.1
3.2
2.7
0.7
0.7
9.2
4.6
0.6
0.7
7.7
1.8
1.8
0.4
0.3
7.4
3.0
0.5
-
-
-
0.3
9.2
1.0
1.0
0.5
<0.1
84.0
64.0
59.9
100.6
55.0
78.1
63.2
105.9
65.0
75.0
62.2
110.1
62.2
78.9
66.9
109.1
60.5
81.3
65.6
109.0
58.4
56.4
-
-
-
-
-
43
43
234
70
30
44
44
128
1?8
188
186
66
86
-
-
46.6
38.8
10.6
-
-
-
Clams/trip
Clans/trip
w
-
~
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
0.3
6.7
5.6
1.5
-
-
-
-
-
SiZe
Size Compo
Comp.(x(x size)
size)
8utter
Butter
Cockle
Gaper
Littleneck
Softshell
No.
Clams Measured
Measured
No. Clams
6utter
Butter
Cockle
Gaper
Littleneck
Softshell
11
13
13
38
92
13
33
80
22
20
247
56
58
13
-
-
-
Table
Table 23.
23. Annual
Annual summary
suninaryofofrecreational
recreational interview data;
data; Peterson
Peterson Flat.
Flat.Coos
Coos Bay
Bay.
1983
1984
1985
1986
1987
12
12
-
24
4
54
5
5
19
284
41
10
191
15
Clams/hour
2.0
19.6
10.0
1.3
13.5
10.8
-
2.2
14.9
6.9
1.5
19.1
12.7
(%)
Oigger
Origin (%)
Digger Origin
Local
State
Non-state
25.0
75.0
-
0
0
50.0
50.0
42.1
-
60.0
40.0
7.4
-
No. Diggers
DiggersSampled
Sampled
No.
No.
Sampled
No. Clams Sampled
No.
Hours
No. Digger Hours
Hours/trip
Clams/trip
23S
235
Species Comp.
Compo (%)other
Species
(%)othertl
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
w
r'
N
Clams/trip other'
other l
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
Clams/hour
Clans/hour other!
other'
Butter
Cockle
Gaper
Littleneck
Soft
shell
Softshell
Size
Compo (x(x size)
Size Comp.
Butter
Cockle
Gaper
Littleneck
Softshell
No.
No. Clams
Clams Measured
Measured
Butter
Cockle
Gaper
Littleneck
Softshell
1 Bentnose
clam.
Bentnose clam
-8.1
21.7
45.1
25.1
-
-
-
1.9
88.9
1.9
-
1.0
-
-
2.1
19.9
68.1
-
-
-
-
0.5
5.2
9.0
0.2
13.0
1.9
-
-
0.2
2.4
4.2
0.1
0.3
2.5
8.7
6.7
1.3
-
-
-
-
0.3
12.0
0.3
-
-
-
-
0.8
-
-
3.5
34.5
60.2
1.4
-
1.6
4.3
8.8
4.9
-
0.0
57.9
9.9
-
0.4
3.8
-
0.6
0.8
2.2
4.5
2.5
0.2
9.6
0.2
--
-
-
-
-
-
--
95.0
64.9
110.6
110.6
62.0
66.8
66.8
95.1
45.5
-
-
-
22
---
-
-
-
113.7
--
-
-
-
23
23
-
-
-
-
-
-
-
-
-
-
43
43
23
23
-
-
11
44
38
81
19
-
-
-
-
-
-
-
-
Table:24.Annual
interviewdata;
data;Pigeon
Pigeon Point,
Point,Coos
Coos Bay.
Bay.
surnaryof
of recreational interview
Table 24. Annual summary
1983
1984
1984
1985
1985
1986
1987
111
1,681
95
43
679
679
70
10
10
190
19
68
68
1,160
145
64
1,003
119
Hours/trIp
Hours/trip
Clams/trip
Clams/hour
0.9
lS.1
15.1
17.7
1.6
15.8
9.7
1.9
19.0
10.0
2.1
17.1
8.0
1.9
15.7
8.4
(%)
Digger
Digger Origin (%)
local
Local
State
Non-state
45.9
48.6
5.4
65.1
55.1
27.9
7.0
20.0
60.0
20.0
51.5
41.2
7.4
32.8
51.6
15,6
15.6
27.1
0.7
51.2
20.9
36.4
8.0
32.7
22.5
0,6
0.6
47.9
2.1
10.0
39.5
56.5
1.3
17.2
24.1
0.8
48.6
6.0
11.1
33.3
5.4
1.3
5.2
3.6
0.1
9.1
0.4
1.9
7.5
9.6
0.2
2.9
4.1
0.1
7.6
0.9
1.7
5.2
3.5
4.8
0.2
4.5
4.1
0.5
0.9
2.8
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No;
Digger Hours
Hours
No. Djqger
Species Comp.
Compo (%)
(%)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
·w
w
-
Clams/trip
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
4.1
0.1
7.7
Clams/hour
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
4.8
0.1
9.1
3.7
3.2
-
-
0.8
3.2
2.2
0.1
1.0
3.9
-
-
0.1
1.4
1.9
0.1
-
-
-
Size Comp.
Camp. (x
Cx size)
size)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
No.
Clams Measured
Measured
No. Clams
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
85.9
37.9
108.0
67.2
-
-
104.5
62.0
84.3
40.0
85.3
60.6
60.5
107.9
63.3
53.3
102.6
54.6
-
-
-
-
-
44
93
145
1B6
186
52
50
51
4
4
19
74
-
-
7
46
9
9
7
-
84.8
--
-
-
84.0
87.2
-
-
15
22
22
82
172
-
-
Table
Table 25. Annual
Annual summary;of
sumary of recreational interview
interviewdata;
data~Empire
Empire Flat,
Flat,Coos
Coos Bay.
Bay.
-----~_._---_
...
No.
No. Diggers
Diggers Sampled
Sampled
No. Clams
Clams Sampled
Sampled
No.
No-; Oi
gger· Hours
Hours
No
Digger
Hours/trip
Clams/trip
Clams/hour
1983
1984
1985
1986
1987
70
70
1,057
99
99
9
180
99
-".-
-9
9
16
222
32
1.4
15.1
10.7
1.0
20.0
20.0
1.7
16.4
9.6
2.0
13.9
7.0
54.3
34.3
11.4
100.0
100.0
18.8
81.2
-
55
82
Oigger
(%)
Digger Origin (%)
Local
State
Non-state
Species Comp.
Camp. (%)
(/.)
Butter
Cockle
Gaper
Littleneck
Softshell
w
"'"
Ciams/trip
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size
Compo (x
Size Comp.
Cx size)
Butter
-
-
-
-
-
-
1.4
11.2
58:8
58.8
0.3
13.3
33.3
53.3
-
-
-
0.2
1.7
8.9
<0.1
--
-
2.7
6.7
-
10.7
-
-
1.2
68.3
28.0
1.2
1.2
0.2
11.2
4.6
0.2
-
-
0.1
-
2.7
607
6.7
10.7
6.6
2.7
0.1
1.4
5.1
0.3
-
-
-
-
-
-
-
-
-
-
-
-
Gaper
Caper
-
-
-
-
-
67.0
95.7
Littleneck
Softshell
-
-
-
-
-
-
No.
Clams Measured
Measured
No. Clams
Butter
-
-
.--
21
12
-
-
Gaper
Littleneck
Snfthll
Softshell
2.7
10.0
0.5
0.1
0.2
1.2
6.3
<0.1
Cockle
Cockle
-
19.4
72.1
3.6
0.5
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Table 26
26.
Annual
Annual summary
sumaryofof recreational
recreational interview
interview data,
data; North
North Spit
Spit, Coos
Coos Bay
Bay.
1983
1984
1985
1986
1987
65
692
692
93
50
746
82
29
449
59
163
2,262
246
103
1,492
151
Hours/trip
Clams/trip
Clams/hOUT'
Clams/hour
1.4
10.7
7.4
1.6
14.9
9.2
2.0
Z.0
15.5
1.5
13.9
9.2
1.5
14.5
14.5
9.9
Di9ger Dri9in
(%)
Diggei'
Origin (%)
local
Local
State
Non-state
72.3
27.7
-
68.0
28.0
4.0
37.9
58.6
65.0
32.5
2..5
2.,5
68.0
27.2
4.9
3.5
17.6
75.3
3.6
6.4
22.0
65.5
6.0
74.6
2.4
6.7
13.7
73.7
3.9
18.1
66.4
0.4
1.9
8.0
0.4
--
1.0
3.3
9.8
0.9
--
0.8
2.7
11.6
0.4
-
0.9
1.9
10.2
0.5
1.1
2.6
9,6
96
0.4
<0.1
0.3
1.3
5.6
0.3
--
0.6
2.0
6.0
6.0.
0.6
-
0.4
1.3
5.7
0.2
0.6
1.3
6.8
0.4
-
0.8
1.8
6.6
0.3
<0.1
85.2
60.2
114.6
114.6
60.6
No.
Diggers Sampled
Sampled
No. Diggers
No.
Clams Sampled
Sampled
No. Clams
No.
Hours
No. Digger Hours
Camp.
Species Comp.
Species
ci
<.T1
3.4
(%)
(%)
Butter
Cockle
Gaper
Littleneck
Li ttlel1eck
Softsheil
Softshell
w
7.6
Clams/tr'lp
Clams/trip
Butter
Cockle
Gaper
U
ttleneck
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
SizeComp.(x
Size
Comp. (x size)
Butter,
Butter
Cockle
Gaper
Littleneck
Softshell
No.
Clams Measured
Measured
No. Clams
Butter
Cockle
Cockle.
Gaper
littleneck
Littleneck
Softshell
-
-
5.1
17.1
-
-
-
-
--
67.7
109.6
109.6
72.0
-
77.0
77
.0
62.2
111.2
59.5
81.8
65.1
100.5.
100.5,
46.5
87.0
64.4
122.7
64.4
--
-
-
-
-
28
39
138
138
28
20
185
22
-
-
99
29
117
2
2
-
21
62
62
71
71
14
7.9
2.7
0.1
65
104
159
37
-
Table
27.
Table 27.
Annual
interviewdata;
data;Clam
Clam Island,
Island,Coos
Coos Bay,
Bay.
Annualsummary
sumaryof
of recreational interview
1983
1984
1985
1985
1986
1987
57
57
1,002
82
462
7,931
737
11
11
208
15
76
1,097
98
116
1,777
134
134
1.4
Clams/hour
Clams)hour
17.6
12.2
1.9
17.2
10.8
1.4
18.9
13.9
1.3
14.4
11.3
1.2
15.3
13.3
(%)
Oi9ger
Digger Origin 00
Local
State
Non-state
36.8
57.9
5.3
51.5
46.3
2.2
81.8
18.2
52.6
46.1
1.3
53.4
37.9
2.88
36.5
54.2
1.1
5.4
4.6
33,7
33.7
59.8
1.8
26.9
12.5
54.3
6.2
0.4
26.7
72.0
0.9
5.5
26.6
66.6
1.3
-
-
0.5
6.4
9.5
0.2
1.0
0.8
5.8
5.1
2.4
10.3
1.2
No. Diggers
DiggersSampled
Sampled
No.
No. Clams
Clams Sampled
Sampled
No.
No.
Hours
No. Digger Hours
Hours/trip
Clams/trip
Compo (%)
(%)
Species Comp.
Butter
Cockle
Gaper
Littleneck
Soft
shell
Softshell
w
'"
Clams/trip
Butter
Cockle
Gaper
Li ttleneck
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
SizeComp.
Size Comp.(x
(x size)
Butter
Cockle
Gaper
littleneck
Littleneck
Softshell
No.
Clams Measured
Measured
No. Clans
Butter
Cockle
Gaper
Littleneck
Softshell
10.3
0.3
8.6
-
0.1
0.8
4.1
10.4
0.1
10.2
10.2
-
-
3.9
0.2
-
-
0.3
4.5
6.6
0.1
0.7
0.5
3.6
6.4
0.2
3.7
1.7
7.5
0.9
3.0
8A
8.1
0.1
0.7
3.5
8.8
0.2
-
-
-
-
78.7
54.1
107.7
107.7
55.5
95.0
76.8
121.0
68.0
89.5
69.4
119.2
66.9
97.0
80.1
118.8
-
86.3
71.0
115.7
115.7
61.9
-
-
-
-
-
11
56
11
55
25
108
13
-
-
66
8
46
4
4
-
12
12
-
11
43
136
99
102
170
9
o
-
-
Table
28.
Table 28.
Annual
data; Bandon
Bandon Softshell,
CoquilleBay.
Bay.
Annual summary
surmiaryofofrecreational
recreational interview data;
Softshell, Coquilie
No.
Diggers Sampled
Sampled
No. Diggers
No Clams
No.
Clams Sampled
Sampled
No;
No DiqqerHours
Digger Hours
Hours/trip
Clams/trip
Clams/hour
Digger
(%)
Digger Origin
Origin (b)
Local
State
Non-state
Speci es Comp
Compo (%)
(%)
Species
Butter
Butfer
1983
1984
1985
6
6
215
5
5
1l
36
2
.-
0.8
08
35.8
358
43.0
430
36.0
360
24.0
240
100.0
--
-
Cockle
Gaper
Li
ttleTleck
Littleneck
Softshell
w
.....
C..
Clans/trip
Clams/trip
Butter
Cockle
Gaper
Littleneck
Softshell
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
Size
Size Compo
Comp.(x(xsize}l
size)'
Butter
Cockle
Gaper
Littleneck
Softshell
No Clams
No.
Measured l
Clams Measured1
Butter
Cockle
Gaper
Littleneck
littleneck
Softshell
1 Not
Not taken.
1.5
15
--
100.0
-
--
-
-
--
1986
1987
21
21
635
35
H88
68
16
1.7
17
30.2
302
18.1
181
2.0
20
8.5
85
4,2
42
-
52.4
28.6
19.0
-
-
-
100.0
100 0
100.0
100 0
-
-
-
-
-
-
-
-
-
8.5
85
24.0
24 0
-
-
-
-
-
18.1
18 1
4.2
42
-
-
-
-
-
-
-
-
-
-
-
-
-
--
-
-
-
-
30.2
302
-
-
-
100.0
100 0
-
-
-
-
36,0
360
43.0
43
0
-
100.0
100 0
35.8
358
-
-
100.0
-
-
-
-
-
-
-
-
79.7
-
-
-
-
-
68
H
Table 29.
29.
Annual summary
allestuaries
estuariescombined.
combined.
Annual
suirmaryofofrecreational
recreational interview
interview data; all
1975
No.
No. Diggers
Diggers Sampled
Sampl~d
No.
No. Clams
Clams"Sampled
Sampled
No~ Digger Hours
No
Hours/trip
Clams/trip
Clams/hour
Digger
(%)
Digger Origin (%)
Local
State
Non-state
Camp. (%)
(%)
Species Comp.
Butter
Cockle
-
19.5
-
12.9
12.9
58,7
58.7
19,1
19.1
721 4,165
15,085 62,963
1,101 6,833
1978
1,276
19,610
1,606
1,506 1,800
1,800
870
12,928 22,189 33,916
33.916
1,104 2,113
2 ,113 2,589
2.589
1985---m6~
1987
1985
1986
1987
898 1,392
14,614 24,691
2,128
1,303
1,508
25,313
2 ,154
2,154
1.4
16.5
11.8
1.2
15.4
12.4
1.3
16.8
16.8
12.6
1.3
15,4
15.4
12,2
12.2
1.3
14,9
14.9
11.7
1.4
1.4
14.7
10,5
10.5
1.4
18.8
13,1
13.1
1.5
1.5
16,3
16.3
11.2
1.5
17.7
11.6
1.4
16,8
16.8
11,8
11.8
25.5
66.6
7,9
7.9
30.5
64.4
5,1
5.1
29.0
62.8
8.3
29,3
29.3
63,8
63.8
7.0
22,9
22.9
70,5
70.5
6.6
30.6
60,0
60.0
9.4
40.5
54.0
5.5
33.6
60.7
5.7
42.7
52.7
4,7
4.7
37,8
37.8
53.7
8.6
36,9
36.9
56,7
56.7
6.4
35,6
35.6
53,4
53.4
10.9
11.1
7.3
46,9
46.9
32.5
7.5
5.8
5.2
56.6
26.9
5.8
5.5
8,5
8.5
53,1
53.1
25.1
6,5
6.5
6.7
12,8
12.8
44.3
17,9
17.9
7,5
7.5
17.5
15.8
29.3
24,9
24.9
9,9
9.9
20,1
20.1
16,2
16.2
31.3
31.8
8.1
12,5
12.5
9,9
9.9
31.2
35,6
35.6
7.8
15.4
7,8
7.8
22,7
22.7
26.1
6,2
6.2
37.2
10,6
10.6
32,2
32.2
23.6
5,0
5.0
28.7
13,3
13.3
40,7
40.7
20,8
20.8
6.7
17,1
17.1
15,3
15.3
41.7
24,0
24.0
5,2
5.2
12.4
12.4
0.9
9,3
9.3
4,4
4.4
1.0
0.9
1.3
8.1
3,8
3.8
1.0
1.0
2.2
7.4
3.0
1.3
2,9
2.9
2.4
4,5
4.5
3,8
3.8
2.4
4,6
4.6
4,7
4.7
1.2
1.9
1.4
1.5
4,3
4.3
4,9
4.9
1.2
1.2
6.9
1.7
5,1
5.1
3,8
3.8
0,8
0.8
4.6
2,4
2.4
7,2
7.2
3.7
1.2
3,0
3.0
2,6
2.6
7,0
7.0
4,0
4.0
0.9
2,1
2.1
0.6
6,6
6.6
3:1
0,7
0.7
0,6
1.0
6,5
6.5
3.1
0.3
0,8
1.6
5.6
2,2
2.2
0.9
2,2
1,9
1.9
3.6
3.0
1.2
2.4
3,6
3.6
3,7
3.7
1.0
1.0
3,0
3.0
3.4
0,8
0.8
4,8
3,5
3.5
2,6
2.6
0,5
0.5
1.2
1.5
4,7
4.7
2.4
0,8
0.8
1.8
4,9
4.9
2,8
2.8
0,6
0.6
78,9
78.9
63,1
63.1
93,0
93.0
47,0
47.0
89,5
89.5
69.2
60.2
98,0
98.0
39,8
39.8
86,4
86.4
76,5
76.5
64,2
64.2
108,0
108.0
66,5
66.5
88,4
88.4
79,8
79.8
63,3
63.3
111.6
47,7
47.7
91.0
107,9
107.9
53,2
53.2
92,7
92.7
8,643
6,661
6.661
7,438
6,997
6.997
6,403
Littleneck
Softs}ell
Softshell
1.0
6,6
6.6
4.6
Clams/hour
Butter
Cockle
Gaper
Littleneck
Softshell
-
1.5
6,6
6.6
2;9
2.9
1.7
1.0
0.6
4.0
2.8
0.6
Camp. (x
Size Comp.
(x size)
Butter
Cockle
Gaper
Li
ttleneck
Littleneck
Softshell
79,6
79.6
61.4
104,1
104.1
42,2
42.2
-
82,4
82.4
62.3
90,7
90.7
40,3
40.3
-
81.1
63,2
63.2
89,5
89.5
45,8
95,5
95.5
101.9
90.7
62,6
62.6
95,5
95.5
44,8
44.8
83;3
83.3
No.
Clams Measured
M~asured
No. Clams
3,615
3.615
7,441
11.
743
11,743
5,096
-
1,284
21,601
1,718
1983-19841983
1984
1.6
1.6
15,1
15.1
9.2
2,3
2.3
10,0
10.0
4,4
4.4
2,6
2.6
1.5
Butter
Cockle
Gaper
198-21980 ---198[-1981
1982
1.5
20,9
20.9
13,7
13.7
2,5
2.5
11,3
11.3
3.7
1.8
1.8
<0.1
Cl
ams/tri p
Clams/trip
1979
847 1,603
14,008 24,697
1,187
1,986
9.3
0.1
Littleneck
Soft
shell
Softshell
00
-
19771
1977!
48,2
48.2
20.9
12.5
7.2
Gaper
w
453
8,837
1976
1.1
0.8
0.5
1.5
3,1
3.1
4,5
4.5
5,1
5.1
1.1
2.2
1.9
1.0
3.2
3.6
0,8
0.8
1.5
1.6
78.1
55.3
104,3
104.3
44,2
44.2
88,2
88.2
75,1
75.1
63,2
63.2
101.4
40,2
40.2
81.8
71.0
60,8
60.8
103,6
103.6
41.4
87.7
79,5
79.5
62,0
62.0
104,2
104.2
50,1
50.1
86.0
5,372
4,044
6,774
5,152
3,2
2,0
1.5
83,0
83.0
61,9
61.9
~....,
1 2 0 . . , . . . . . - - - - - - -..............- - - - _ -_ _.......
120
100
106
80
80
E
60
60
4r-....<'.-.....,....-..,..
..--......~
................---
-
........
W
UI
~~
N
N
iii
.
..
40
40
--'-0__
__
20
20
BUDER
COCKLE
G'J'ER
-IS- UmENECK
_It__
SOF1SHELL
I-iSOFTSHELL
I
1975
1979 1960
1980 1981
1981 1982
1982 1983 1984 1986
1985 1986 1987 1988
1975 1976 1977 1978 1979
YEAR
YEAR
Figure 1.
1~
Length composition of recreationally harvested
clams! all
all bays
bays combined,
combined, 1975-87.
1975-87.
bay clams,
39
39
Table
30.
Table 30.
Peak counts
counts of
of clam
clam diggers'.
diggers 1 .
Peak
Estuary
Ti defl at
Ti
llamook
Tillamook
Garibaldi
Flat
Garibaldi Flat
BayOcean
Bay Ocean
1979-1980
1979
1980
1975
1975
1976
1916
1977±
19771
1978
1978
1981
1981
1982
1982
1983
1983
1984
1984
1985
1985
1986
1986
"T987
1987
425
425
350
350
280
280
131
131
122
122
225
225
39
39
256
256
107
107
300
300
-
460
460
33
33
516
516
13
13
487
487
10
10
350
350
118
118
380
380
17
17
400
400
Netarts
Netarts
Happy Camp
Camp
Happy
--
175
175
73
73
-
150
150
160
160
425
425
500
500
478
478
200
200
191
191
314
314
265
265
Nestucca
little Nestucca
Nestucca
Little
-
-
-
-
-
-
--
44
44
66
12
12
6
6
88
88
-
Yaquina
Yaquina
Bridge Bed
Bed
Bridge
Breakwater Bed
Bed
Breakwater
Idaho
Idaho point
Point
245
245
127
127
110
110
138
138
120
120
98
98
30
30
-
17
225
225
27
27
38
38
41
41
45
45
63
63
176
176
16
16
41
41
275
275
26
26
46
46
12
12
20
20
84
84
2B
28
35
35
10
10
-
84
84
20
20
61
61
26
26
"18
18
625
625
-
91
91
23
23
66
66
24
24
5
5
107
107
25
25
31
31
11
11
9
9
204
204
30
30
50
50
34
34
14
14
225
225
46
46
56
56
20
20
77
-
14
14
-
55
20
20
22
22
0
0
10
10
22
22
13
13
15
15
4
4
---"
-
-
-
NW Gas Plant
NWGasPlant
-
-
-
Coquille Point
Point
Coquille
-
-
-
-
--
--
-
North Beach
NorthBeach
Bay Shore
Bayshore
-
Waldport Breakwater
Breakwater
Waldport
-
Siuslaw
No1th
Fork
North Fork
-
55
55
Coos
Coos Bay
Bay
Charleston Triangle
Triangle
Charleston
Charleston Flat
Flat
Charleston
-
-
-
-
-
Alsea
Alsea
...aa
Bandon
Bandon
-
-
109
109
57
57
-
-
-
-
-
--
---
-
-
-
-
-
-
Pigeon Point
PigeonPoint
-
-
-
Empire
Flat
Empire Flat
Hanson's Narina
Marina
Hanson's
Clam Island
Ciamlsland
-
-
-
North Spit
-
Softshe11
Softshell Bed
Bed
-
-
-
17
-
Fossil
Fossil Point
Point
-
-
-
Peterson Fl at
PetersonFlat
C)
-
-
62
62
45
45
-
-
-----
-
-
--
-
-
-
-
-
-
--
,
33
--
--
--
44
49
49
12
12
33
31
31
99
146
146
33
33
22
22
43
43
41
41
44
44
56
56
--
"
-------
31
31
64
64
55
38
38
62
62
20
20
5
24
24
30
30
41
41
26
26
2
2
00
42
42
19
19
39
39
27
27
15
15
44
44
67
67
22
22
87
87
66
66
14
14
-.
-
-
-
-
-
-
-
..
-
-
11 Number
Number of
tideflat at
Count occurred
occurred at
at or
or near
near low
low tide.
tide.
of clam
clam diggers
diggers actually
actually on
on tideflat
at time
time Of
of count.
count. Count
:{'i.\
4
4
-
-
-
-
-
50
50
-
-
-
97
97
44
44
3
58
58
4
-
-
-
86
86
02
83
119
119
1CO
158
-
-
50
50
-
-
-
Tabl
3I.
Tablee 31.
Summary
of pounds
pounds of
of bay
bay clams
clams reported
reported commercially
commercially harvested
harvested in
in
Summary of
Oregon
by species,
species, 1970-87.
1970-87.
Oregon by
Year
Year
Butter
Butter
Cockle
Cockle
1970
1970
1971
1971
1972
1972
1973
1973
1974
1974
1975
1975
1976
1976
1977
1977
1978
1978
1979
1979
1980
1980
1981
1981
1982
1982
1983
1983
1984
1984
1985
1985
1986
1986
1987
1987
885
885
217
217
52
52
95
95
412
412
00
816
816
607
607
1,452
1,452
606
606
40
40
2,409
2,409
3,654
3,654
4,035
4,035
4,842
4,842
1,646
1,646
2,862
2,862
3,046
3,046
12,257
12,257
9,391
9,391
7,269
7,269
.5,756
5,756
6,073
6,073
6,855
6,855
322
322
859
859
6,717
6,717
2,299
2,299
2,244
2,244
4,580
4,580
10,517
10,517
2,579
2,579
17,912
17,912
29,412
29,412
31,681
31,681
20,202
20,202
Gaper
Littleneck Softshell
$oftshell Macoma
Matoma
Gaper Littleneck
1,218
1,218
10,345
10,345
34,006
34,006
185
185
00
15,024
15,024
85,831
85,831
81,775
81,775
207,685
207,685
91,028
91,028
74,459
74,459
68,508
106,440
106,440
95,091
95,091
50,573
50,573
20,121
20,121
17,021
17,021
6,368
6,368
41
211
863
863
639
639
1,406
1,406
9,771
9,771
8,987
8,987
4,311
4,311
455
455
232
232
1,056
1,056
0
0
4,268
4,268
4,892
4,892
13,231
13,231
34,444
34,444
46,874
46,874
46,266
46,266
27,487
27,487
14,140
14,140
10,661
10,661
7,714
7,714
18,772
18,772
1,349
1,349
843
843
360
360
630
630
1,366
1,366
52
52
979
979
456
456
749
749
248
248
36
36
366
366
1,809
1,809
3,558
3,558
2,527
2,527
00
220
220
0
0
0
0
0
0
00
00
894
894
00
00
00
00
0
0
00
00
00
00
00
Total
Total
25,884
25,884
28,526
28,526
61,505
61,505
17,156
17,156
16,315
16,315
26,550
26,550
88,054
88,054
85,733
85,733
216,962
216,962
94,912
94,912
81,467
81,467
81,138
81,138
134,090
i34,090
136,185
136,185
120,567
120,567
99,254
99,254
82,609
82,609
46,283
46,283
Table 32.
32.
Table
Summary'of
pounds ofofbay
bayclams
clamsreported
'reportedconinercially
commercially harvested
harvested in
in major
estuaries.,1970-87.
Sumary of pounds
major Oregon
Oregon estuaries,
1970-87.
Year
Year
Nehalem
Nehalem
1970
1970
258
258
7,819
7,819
2,210
2,210
444
444
0
0
1971
1971
589
589
6,168
6,168
1,598
1,598
1,819
1,819
0
0
1972
1972
80
80
9,637
9,637
914
914
57
57
70
70
1973
1973
329
329
11,997
11,997
1,191
1,191
0
0
1974
1974
882
882
9.309
9,309
2,049
2,049
1975
1975
0
0
4,637
4,637
1976
1976
00
1977
1977
Ti
11amook
Tillamook
Yaquina
Yaquina
Alsea
Alsea
Siuslaw
Suslaw
Coquille
Coqui
11 e.
Total
Total
Umpqua
l/mpqua
Coos
Coos
0
0
10,631
10,631
4,522
4,522
00
25,884
25,884
0
0
7,459
7,459
10,893
10,893
0
0
28,526
28,526
0
0
6,105
6,105
44,642
44,642
0
0
61,505
61,505
0
0
00
786
786
2,853
2,853
0
0
17,156
17,156
398
398
00
00
445
445
3,232
3,232
00
16,315
16,315
0
0
00
13
13
00
309
309
21,553
21,553
38
38
26,550
26,550
998
998
0
0
0
0
480
480
00
0
0
86,576
86,576
00
88,054
88,054
00
2,619
2,619
00
71,013
71,013
00
00
35
35
12,066
12,066
00
85,733
85,733
1978
1978
00
3,111
3,111
00
172,047
172,047
00
00
00
41,804
41,804
00
216,962
216,962
1979
1979
174
174
433
433
00
74,565
74,565
0
0
3,432
3,432
00
16,308
16,308
00
94,912
94,912
1980
1q80
373
373
5,320
5,320
486
486
244
244
0
0
9,109
9,109
00
65,935
65.935
00
81,467
81,467
1981
1981
65
65
4,259
4,259
00
128
128
0
0
684
684
00
76,002
76,002
0
0
81,138
81,138
1982
1982
10,862
10,862
11,501
11,501
37
37
15
15
00
223
223
25
25
111,427
111,427
0
0
134,090
134,090
1983
1983
31,856
31,856
3,144
3,144
200
200
5,253
5,253
00
15
15
00
95,717
95,717
0
0
136,185
136,185
1984
1984
23,069
23,069
42,663
42,663
0
0
22
22
00
50
50
00
54,763
54,763
0
0
120,567
120,567
1985
1985
40,349
40,349
34,148
34,148
240
240
00
00
895
895
268
268
23,030
23,030
324
324
99,254
99,254
1986
1986
30,545
30,545
28,737
28,737
480
480
66
00
1,206
1,206
0
0
19,557
19,557
2,078
2,078
82,609
82,609
1987
1987
10,723
10,723
22,936
22,936
00
1,114
1114
250
250
654
654
00
10,214
10,214
392
392
46,283
46,283
Net.arts
Netarts
42
42
50
1987
1987
40
N • 84
N
30
30
20
10
00
40
1986
N = 100
30
30
20
UJ
Ui
(!)
CD
10
10
z
0
«I
IZ
UJ
'Li
U
C-)
1985
c:
UJ
'Li
0.
111
'"'
40
1983
N·98
N98
30
20
10
10
0
'"'
40
1984
N·240
N = 240
30
20
10
0
900 979
1988
1985 1984
1981 1980
1979 197S
1978 19/I
1977 I9
1976
982 1981
984 1983
983 1982
967 1986
198 196$
988 1987
YEAR CLA5S
CLASS
Figure 2. Age
Age composition
composition of
of commercial
commercial subtidal native littleneck
Bay, 1984-87.
1984-87.
clam harvest, Nehalem Bay,
43
43
60
60
1987
1987
N=100
COCKlES
caCKLES
50
50
40
40
w
Lu
Cl
CD
cc
<
!zW
30
30
Lu
0C)
IX:
W
ILl
a.
20
20
gw
10
10
o+--~-~
0
I
198619851984199319821981198019791978
1981
1980 1979 1978
1986 1985 1984 1983 1982
YEAR-CLASS
3. Age composition of commercial
Figure 3.
commercial subtidal cockle
clam harvest,
Tillamook Bay,
Bay, 1987.
1987.
harvest, Tillamook
60
60 ...-~-----------------'
50°
w
~
2
Z
W
1987
1987
N=100
UTILENECKS
LITTLENECKS
40
40-
30
30
0
C)
IX:
W
LU
a.
0.
20
20
-"
10
10
0
1986
1985
1984
1983
1982
1981
1980
1980
1979
YEAR-CLASS
Figure
4. Age composition of commercial
commercial subtidal littleneck
Figure 4.
clam harvest,
Tillamook Bay,
Bay, 1987.
1987.
harvest, Tillamook
44
44
'"
50
1987
N
138
=
40
30
20
'0
°
60
50
1986
N
= 100
40
30
20
W
Ui
<.:l
10
'0
;::
%
W
0
a:
Cr
w
Ui
0-
01
°
60
60
50
50
1995
N = 180
40
30
-
20
50
50
so
1984
N == 136
136
40
30
20
10
'0
535231g7975777575747372Zl7059S8bfbbbb
83 &2 8\ 80 79 78 71 76 1S 74 73 72 71 7069686786656463
YEAR
YEAR CLASS
Figure
Age composition
ofcoarnerciat
commercial subtidat
subtidalgaper
gapercLam
clam
cocpostion of
Figure 5. Age
harvest, Pigeon
Pigeon Point,
Point,Coos
Coos Bay,
Bay, 1984-87.
1984-87.
45
60
- r - - - - - - - -....................- - - - - - - - - - - - - ,
50
1987
N=100
W
40
là
Cl
<C
I-
:z
W
30
a:
w
c..
20
0
II
10
IF
o - 1 - - - - . - - - - - ,...
1988
1987
1986
1985
1984
1983
1982
YEAR·CLASS
YEAR-CLASS
Figure 6.
6. Age composition
composition of commercial
commer9ial intertidal
intertidal cockle
clam harvest,
harvest, Gas Plant,
Plant, Yaquina
Yaquina Bay,
Bay, 1987.
1987;
46
Table 33.
Table
33.
Plot
Plot
Summary
of experimental
experimental Manila
Manila littleneck
plants in
Summary of
littleneck clam
clam plants
in Tillamook
Tillamook
Bay,
1971-87.
Bay, 1971-87.
No.
No.
Planting
Planting
Date
Date
1
9/18/71
9/18/71
2
2
3/4/83
3/4/83
.3
13
4/16/83
4/16/83
4
:.
Number
Number
Released
Released
20,0001
20,000 1
:
Size
at
Size at
Release
Release
(mm)
(mm)
Planting
Planting
Dens'ty
Dens~ty
(ft ))
(ft
Sample Recovery
Recovery
Sample
Date
Date
Size
Size
(mm)
(mm)
Survival
Survival
(%)
(%)
6.3
6.3
50
50
5/16/72
5/16/72
-
0.0
0.0
-
800
800
2/21/84
7/15/84
7/15/84
8/02/85
8/02/85
14.1
14.1
17
.5
17.5
30.22
30
0.4
0.4
0.3
0.3
0.1
0 1
1,000
1,000
41.1
41.1
5.2
5.2
7/15/84
7/15/84
41.8
41.8
19.2
19.2
6/16/83
6/16/83
10,000
10,000
-
22.2
22.2
9/08/83
9/08/83
7/15/84
7/15/84
8/02/85
8/02/85
31.0
31.0
34.0
34.0
37.6
37.6
18.9
18.9
11.7
11.7
0.6
0.6
55
6/30/83
6/30/83
10,00011
10,000
-
44.0
44.0
9/08/83
9/08/83
7/15/84
7/15/84
13.6
13.6
21.00
21
0.7
0.7
0.5
0 5
6
6
3/14/84
1,150
1,150
-
6.3
6.3
7/15/84
7/15/84
8/02/85
8/02/85
40.6
40.6
-
44.4
44.4
0.0
0 0
7
3/14/84
.3/14/84
700
700
-
10.6
10.6
7/15/84
7/15/84
8/02/85
8/02/85
5/28/86
39.1
39.1
45.0
45.0
-
17.0
17.0
1.9
1.9
0.0
0.0
7
2,000,00011
2,000,000
88
3/14/84
4,00011
4,000
-
79.6
79 6
7/15/84
-
0.0
0 0
99
5/07/84
5/07/84
2,400
2,400
-
10.0
10.0
7/15/84
7/15/84
8/02/85
8/02/85
5/28/86
6/16/87
6/16/87
36.6
36.6
42.2
42.2
47.8
47.8
49.6
49.6
100+
100+
100+
100
37.5
37.5
39.0
39,0
10
10
7/15/84
7/15/84
1,000
1,000
36.5
36.5
10.2
10.2
8/02/85
8/02/85
-
0.0
0,0
11
11
7/31/84
7/31/84
300
300
6.3
6.3
8/02/85
8/02/85
5/28/86
5/28/86
6/16/87
49.8
49.8
49.3
49.3
49.2
49.2
47.6
47,6
71.4
71.4
43.7
43.7
12
12
11/21/84
11/21/84
3,400
3,400
10.0
10.0
8/02/85
8/02/85
5/28/86
5/28/86
6/16/87
6/16/87
35.3
35.3
38.1
38.1
-
20.0
20.0
2.0
2.0
0.0
0.0
8/02/85
5/28/86
6/16/87
6/16/87
34.5
34.5
40.0
40.0
46.6
46.6
34.0
34.0
20.0
20.0
16.0
16.0
13
13
11/21/84
11/21/84
3,400
3,400
31.0
31.0
31.0
31.0
10.0
10.0
47
47
Table 33
33 (continued)
(continued)
Table
Plot
Plot
No.
No.
Planting
Planting
Date
Date
Number
Number
Released
Released
Size at
Size
at
Release
Release
(mm)
(mm)
Planting
Planting
Densjpy
Dens~ty
Sample
Sample
Date
Date
(ft ))
(ft
Recovery
Recovery Survival
Survival
Size
(%)
Size
(%)
(mm)
(mm)
14
14
11/21/84
11/21/84
13,500
13,500
31.0
31.0
10.0
10,0
8/02/85
8/02/85
5/28/86
5/28/86
:6/16/87
6/16/87
35.8
35.8
40.2
40.2
44.3
.44.3
56.0
56.0
32.0
32.0
20.0
20.0
15
15
4/09/85
4/09/85
10,200
10,200
37.0
37.0
10.0
10.0
8/02/85
8/02/85
5/28/86
5/28/86
6/16/87
6/16/87
44.2
44.2
45.8
45.8
48.8
48.8
82.0
82.0
78.0
78.0
90.0
90.0
16
16
4/09/85.
4/09/85
12,700
12,700
37.0
37.0
10.0
10.0
8/02/85
8/02/85
5/28/86
5/28/86
6/16/87
6/16/87
40.0
40.0
44.8
44.8
47.9
47.9
96.0
96.0
97.0
97.0
84.0
84.0
17
17
4/09/85
4/09/85
7,700
7,700
37.0
37.0
10.0
10.0
8/02/85
8/02/85
5/28/86
5/28/86
6/16/87
6/16/87
44.2
44.2
42.9
42.9
49.5
49.5
83.0
83.0
52.0
52.0
18
18
4/25/85
4/25/85
1,2
100,000
ioo,0001'2
100.0
100.0
7/25/86
7/25/86
6/16/87
6/16/87
25.0
25.0
30.4
30.4
14.8
14,8
15.0
15.0
19
19
4/25/85
4/25/85
10,00011
10,000
100.0
100.0
7/25/86
7/25/86
6/16/87
6/16/87
24.3
24.3
30.4
30.4
1.0
1.0
0.3
0.3
.
1 Hatchery
produced clams,
clams, planted
planted as
as set.
set.
Hatchery produced
22 Clams
placed under
under "Vexar"
"Vexar" nettin9.
netting,
Clams placed
1
48
48
:
54.0
54.0
Table
34. Summary
of experimental
experimental Manila
Manila littleneck
littleneck clam
clam plants
plants in
Bay,
in Yaquina
Vaquina Bay,
Summary of
Table 34.
1970-87.
1970-87.
Plot Subplot Planting
No.
Date
No.
1
9/20/71
7/10/72
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17-22
2
1
2
3
4
5
7/10/72
7/10/72
7/10/72
7/12/72
7/12/72
9/7/72
9/7/72
9/7/72
9/7/72
9/7/72
9/7/72
9/7/72
9/7/72
9/7/72
10/4/72
4/19/72
4/19/72
4/19/72
4/19/72
4/19/72
Number
Released
20,000
1,710
24,240
1,460
52,340
130,000
3,860
35,000
11,500
11,700
24,700
1,700
7,500
1,700
4,900
78,000
35,500
800
800
800
800
1,250
Size at
Release
Planting
Densi2ty
(mm)
(ft )
5.7
50
10.6
6.7
10.8
6.0
6,6
10.6
-
4.1
6.1
114
101
97
102
120
97
194
194
98
103
Sample
Date
Recovery Survival
Size
(%)
(mm)
5/12/72
4/11/73
4/24/74
10.0
18.3
8/1/73
7/22/74
20.8
20.6
24.6
8/1/73
7/22/74
16.1
30.4
0 0
8/1/73
7/22/74
11.8
8/1/73
7/22/74
12.0
8/2/73
7/22/74
11.7
-
-
-
-
16.5
6,1
1,3
1.2
4.1
0.0
21.4
0 0
-
156
-
-
-
-
5.3
148
3.6
3.7
6.5
11.0
3.7
49
r1pJ
80
80
80
80
125
-
3.8
0.0
9/6/72
5/4/73
28.4
3.8
9/3/72
5/4/73
22,0
29.2
3.8
9/6/72
5/4/73
22,6
30 7
1 3
9/6/72
5/4/73
23.3
31.7
7.5
5/4/73
29.6
1.3
19.1
Table
34 (continued)
(continued)
Table 34
Plot
Pl ant i ng
Subplot Planting
Plot Subplot
Date
Date
No.
No.
No.
No.
33
44
Number
Number
Released
Released
Size
at
Size at
Release
Release
(mm)
(mm)
Planting
Planting
Dens4ty
Dens~ty
(ft
(ft ))
Sample Recovery
Recovery Survival
Sample
Survival
Date
Date
Size
Size
(mm)
(mm)
(%)
(%)
1,250
1,250
6.5
6,5
125
125
5/4/73
5/4/73
-
0.0
0.0
1,250
1,250
11.0
11.0
125
125
5/4/73
5/4/73
32.2
32.2
2.5
2.5
4/19/72
4/19/72
2,000
2,000
3.7
3.7
200
200
.5/4/73
5/4/73
29.8
29,8
2.5
2.5
99
4/19/72
4/19/72
2,000
2,000
6.5
6.5
200
200
5/4/73
5/4/73
33.6
33.6
3.8
3,8
10
10
4/19/72
4/19/72
2,000
2,000
11.0
11.0
200
200
5/4/73
5/4/73
-
0.0
0.0
11
5/22/70
5/22/70
4,000
4,000
3.0
3,0
20
20
8/18/70
8/18/70
10/28/70
10/28/70
1/7/71
1/7/71
5/14/71
5/14/71
4/18/72
4/18/72
12.0
12.0
19.1
19.1
19.6
19.6
21.4
21.4
33.9
33.9
8.0
8.0
11.0
11.0
4.0
4.0
3.0
3.0
0.0
0.0
2
2
10/5/71
10/5/71
4,000
4,000
-
4/18/72
4/18/72
-
0.0
0.0
1
7/27/72
7/27/72
1,800
1,800
50
50
9/5/72
9/5/72
4/23/73
4/23/73
4/10/74
4/10/74
10.5
10.5
16.4
16.4
9/5/72
9/5/72
4/23/73
4/23/73
4/10/74
4/10/74
9.8
9.8
14.6
14.6
9/5/72
9/5/72
4/23/73
4/23/73
4/10/74
4/10/74
8.5
85
14.6
14.6
-
29.0
29.0
26.3
26.3
0.0
0.0
66
4/19/72
4/19/72
77
4/19/72
4/19/72
88
1
2
2
3
3
7/27/72
7/27/72
7/27/72
7/27/72
.
1,800
1,800
1,800
1,800
6.7
6.7
6.7
6.7
6.7
6.7
50
50
50
50
-
-
55.0
55.0
34.4
34.4
0.0
0.0
83.0
83.0
12.8
12.8
0.0
0.0
6.2
6.2
50
50
4/19/73
4/19/73
-
0.0
0.0
7301
730 1
34.5
34.5
20.3
20.3
9/17/81
9/17/81
-
0.0
0.0
8,70011
8,700
31.00
31
10
10
3/15/85
31.2
31 2
2.55
2
5
5
1
10/20/72
10/20/72
66
11
4/24/81
4/24/81
77
1
12/5/84
12/5/84
88
1
99
1
1/30/85 Betty
Betty Fowler
Fowler dumped
3,000-5,000 lbs
lbs of
of dying
dying clams
clams into
into
dumped 3,000-5,000
1/30/85
Yaquina Bay
Bay at
dock.
Yaquina
at their
their dock.
4,3002
49.4
49.4
35.3
86
7/24/86
4,300 2
18.1
8/1/85
18.1
86
7/24/86
35.3
8/1/85
72.0
72.0
4/17/87
41.2
4/17/87
41.2
10
11
7/24/86
7/24/86
2
7/24/86
7/24/86
10
1
1
1
1
2
2,500
2,500
2,500
2,500
2,50022
2,500
6.7
6.7
100
100
4/17/87
4/17/87
15.8
.15.8
0.4
0.4
6.7
6.7
100
100
4/17/87
4/17/87
22.3
22.3
0.4
0.4
50
Table
34 (continued)
(continued)
Table 34
Pl
Plot
otSubpl
Subplot
ot Planting
Pl anti ng
No.
Date
No.
Date
No.
No.
11
11
Number
Number
Released
Released
Size
at
Size at
Release
Release
(mm)
(mm)
Planting
Planting
Dens
j,ty
Dens~ty
(ft'))
(ft
Sample
Sample Recovery
Recovery SUrvival
Survival
Date
Date
(%)
Size
(%)
Size
(mm)
(mm)
6.7
6 7
100
100
4/17/87
4/17/87
-
0.00
0
6.7
6.7
100
100
4/17/87
4/17/87
18.3
18.3
6.8
6.8
6.7
6.7
100
100
4/17/87
4117/87
18.9
18.9
1.2
1.2
7/24/86
7/24/86
2,500
2,500
2,50022
2,500
6.7
6.7
100
100
4/17/87
4/17/87
-
0.0
0.0
77
7/24/86
7/24/86
2,500
2,500
6.7
6.7
100
100
4/17/87
4/17/87
19.8
19.8
13.6
13.6
8
8
7/24/86
7/24/86
2
2,5002
2,500
6.7
6.7
100
100
4/17/87
4/17/87
24.5
24.5
1.6
1.6
99
7/24/86
7/24/86
6.7
6.7
100
100
4/17/87
4117/87
20.3
20.3
20.8
20.8
10
10
7/24/86
7/24/86
2,500
2,500
2,5002
2,500 2
6.7
6.7
100
100
4/17/87
4/17/87
17.8
17.8
20.8
20.8
11
11
7/24/86
7/24/86
2,500
2,500
6.7
6.7
100
100
4/17/87
4117/87
18.9
18.9
29.2
29.2
12
12
7/24/86
7/24/86
2
2,5002
2,500
6.7
6.7
100
100
4/17/87
4117/87
16.8
16.8
10.0
10.0
13
13
7/24/86
7/24/86
6.7
6.7
100
100
4/17/87
4117/87
18.9
18.9
7.2
7.2
14
14
7/24/86
7/24/86
2,500
2,500
2,50022
2,500
6.7
6.7
100
100
4/17/87
4117/87
19.7
19.7
89.2
89.2
11
8/19/86
8/19/86
2
100,000
ioo,0002
6.7
6.7
100
100
4/17/87
15.7
15.7
2.2
2.2
22
8/19/86
8119/86
10,000
10,000
6.7
6.7
100
100
4/17/87
4/17/87
-
0.0
0.0
3
3
7/24/86
7/24/86
44
7/24/86
7/24/86
5
5
7/24/86
7/24/86
66
2,500
2,500
2,50022
2,500
11 Planted
Planted as
as adult
adult clams.
clams.
22 Planted
"Vexar" netting.
netting.
under 'Vexar"
Planted under
51
51
Table 35.
35.
Table
ANOVA
for aa two-factor
two-factor analysis
analysis of
of variance
variance on
on clams/ft2.
clams/ft Z.
ANOVA for
Source
Source
Covering
(A)
Covering (A)
Substrate
(B)
Substrate (B)
AB
AB
Error
Error
df
df
11
6
6
66
84
84
Sum
of Squares
Squares
Sum of
Mean
Mean Square
Suare
F,.test
F-test
P Value
Val u.e
P
175.112
175.112
3,397.959
3,397.959
2,791.102
2,791.102
7,043.429
7,043.429
175.112
175.112
566.327
566.327
465.184
465,184
83.850
83.850
2.088
2.088
6.754
6.754
5.548
5.548
.1521
.1521
.0001
.0001
.0001
.0001
52
52
Table
36. ANOVA
f0 one
factor analysis
analysis of
of variance
variance on
on substrate
type and
and
ANOVA foj
substrate type
Table 36.
2 one factor
clams/ft.
clams/ft4.
Source
Source
df
df
Sum of
of Squares
Squares
Sum
Mean Square
Square
Mean
Between
Between groups
groups
With
i n groups
groups
Within
Total
Total
66
91
91
3,397.959
3,397.959
10,009.643
10,009 643
13,407.602
13,407.602
566.327
566,327
109.996
109 996
Table 37
37.
Table
Comparison
Comparison
97
97
F-test
F-test
5.149
5.149
Value
P Value
P
.0001
.0001
clams planted
Multiple
survival of
planted in
in various
various
Multiple comparisons
comparisons of
of survival
of Manila
Manila clams
substrate types,
one factor
factor ANOVA,
ANOVA. 1987
1987.
substrate
types one
Mean Difference
Difference
Mean
/
Natural
vs. raked
raked
Natural vs.
Natural
vs. whole
whole shell
shell
Natural vs.
ground shell
shell
Natural
vs. ground
Natural vs.
Natural vs.
vs. gravel
gravel
Natural
and gravel
gravel
Natural vs.
vs. wholeshell
wholeshell and
Natural
and gravel
gravel
Natural vs.
vs. groundshell
groundshell and
Natural
Raked
vs. whole
whole shell
shell
Raked vs.
Raked
vs. groundshell
groundshell
Raked vs.
Raked vs.
vs. gravel
gravel
Raked
Raked vs.
vs. whole
whole shell,
shell and
and gravel
gravel
Raked
Raked vs.
vs. groundshell
groundshell and
and gravel
gravel
Raked
Whole
shell vs.
vs. ground
ground shell
shell
Whole shell
Whole shell
shell vs.
vs. gravel
gravel
Whole
Whole shell
shell vs.
vs. whole
whole shell
shell and
and gravel
gravel
Whole
Whole shell
shell vs.
vs. ground
ground shell
shell and
and gravel.
gravel.
Whole
Ground shell
shell vs.
vs. gravel
gravel
Ground
Ground shell
shell vs.
vs. whole
whole shell
shell and
and gravel
gravel
Ground
Ground
Ground shell
shell vs.
vs. ground
ground shell
shell and
and gravel
gravel
Gravel
vs. whole
whole shell
shell and
and gravel
gravel
Gravel vs.
Gravel
vs. ground
ground shell
shell and
and gravel
gravel
Gravel vs.
Whole
Whole shell
shell and
and gravel
gravel vs.
vs. ground
ground shell
shell and
and gravel
gravel
** Significant
Significant at
at 95%
95% confidence
confidence level.
level.
53
53
-1.
071
-1.071
-0.071
-0.071
-2.571
-2.571
-7.286
-7.286
-6.857
-6.857
_17.786*
-17.786*
1.000
1.000
-1.
-1.500
500
-6.214
-6.214
-5.786
-5.786
_16.714*
-16.714*
-2.500
-2.500
-7.214
-7.214
-6.786
-6.786
_17.714*
-17.714*
-4.714
-4.714
-4.286
-4.286
_15.214*
-15.214*
-0.429
-0.429
_10.500*
-10.500*
_10.929*
-10.929*
Fisher
PLSD
Fisher PLSD
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7,875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
7.875
Plot
No.
Plot No.
12
12
Sub-plot
No.
Sub-plot No.
1
1
2
2
Date
No. Planted
Planted
Date No.
7/15/87
7115/87
7/15/87
7/15/87
-$NE:WRJRI
<.Tl
"""
~q lAit1/A
12
13,
ffiI
-$I
o
-I('JOO
:10.00
-,
3000
"iOOO
4000 f'I!ST'
Figure 7.
7. Location of Manila littleneck clam releases in
in
Yaquina Bay,
Bay. 1987.
1987.
100,000
100,000
20,000
20,000
Table 38.
38.
Table
Summary
experimental Manila
plants in
Bay,
Summary of
of experimental
Manila littleneck
littleneck clam
clam plants
in Coos
Coos Bay,
1973-87.
1973-87.
Plot
Plot Subplot
Subplot Planting
Planting
No.
Date
Mate
No.
No.
No.
Number
Number
Released
Released
Size
Size at
at
Release
Release
(mm)
(mm)
Planting
Planting
Densi,,ty
Dens~ty
(ft
(ft'))
Sample
Sample Recovery
Recovery Survival
Survival
Size
(%)
Size
(%)
Date
Date
(mm)
(mm)
11
11
8/17/73
11,550
11,550
7.1
7.1
50
50
5/8/74
5/8/74
-
0.0
0.0
22
1
8/17/73
8/17/73
7.1
7.1
50
50
5/8/74
5/8/74
-
0.0
0.0
33
11
12/19/84
12/19/84
11
,500
11,500
12,66011
12,660
31.0
31.0
10.3
10.3
5/8/85
5/8/85
7/19/85
7/19/85
5/29/86
5/29/86
2/24/87
2/24/87
32.3
32.3
35.8
35,8
40.1
40.1
41.4
41.4
39.8
39.8
35.0
35.0
10.0
10.0
10.7
10.7
4
4
1
1
7/19/85
7/19/85
17,0002
17
,000 2
12.2
12.2
100
100
5/29/86
5/29/86
2/24/87
2/24/87
23.2
23,2
33.3
33.3
lOOt
100+
85.0
85.0
55
11
8/20/86
8/20/86
100,00022
100,000
6.7
6.7
100
100
2/24/87
2/24/87
12.5
12.5
88.7
88.7
66
11
8/20/86
8/20/86
3,300
3,300
6.7
6.7
132
132
2/24/87
2/24/87
12.5
78.8
78.8
7
7
1
1
8/20/86
8/20/86
6.7
6.7
100
100
2/24/87
2/24/87
10.9
10.9
30.0
30.0
88
1
1
9/19/86
9/19/86
10,000
10,000
2
10,000
io,0002
10.0
10.0
100
100
4/20/87
4/20/87
17.3
17.3
34.4
34.4
99
1
9/19/86
9/19/86
10,000
10,000
10.0
10.0
100
100
4/20/87
4/20/87
13.3
13.3
0.8
0.8
1
1
1 Planted
Planted as
as adult
adult clams.
clams.
22 Planted
"Vexar" netting.
netting.
Planted under
under "Vexar"
1
55
55
/
DoAr 4JSUI
Jsrn
' - - - SOAr
01U
loU,lIrMC
CEHTCa
SOUTH
aC,I,GH
SOUTh OCACH
Figure 8.
Figure 8.
PLAN
7''"----
-
/
/
SCIO'C,
""'"
1987.
a1 1987 .
Subtidat clam suey
area jnYaina
in
yaquina Bay,
.. .,_." ... uay, 1:1(1 •
Stidat clam survey area
.
56
:00
100
19IH
1987
N ': 104
104
Nt
1983
N
N == 191
191
80
60
40
20
0
1986
N =
= 149
149
1982
N
N
80
118
= 118
60
40
W
Ui
20
iiiw
0
~
Ui
()
a
-
0::
UI
W
0.
0.
lUS
1985
1981
N :: 370
N370
80
N
= 162
60
::
40
&0I
I
20
0
1984
N
140
N
1980
80
N = 663
N663
=
J
60
0
40
0
200
68
1966 68
10
70
72
12
14
74
76
78
80
82
64
84
86
88
90 1966 68
YEAR-CLASS
YEAR·CLASS
70
72
74
76
78
80
82
84
84 85
86 88
YEAR· CLASS
YEAR-CLASS
Figure
Figure 9.
9. Age composition of
of subtidal
subtidal gaper
gaper clams,
clams, Area
Area 2,
2,
Bay, 1980-87,
1980-87.
Yaquina Bay,
57
91
90
Table
Table 39.
Year
Year
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
Population
Population and
and biomass
biomass estimates
estimates (95%
(95% C1)
CI) for
for gaper clams
clams in
in
Yaquina
1975-87.
Yaquina Bay,
Bay, Area
Area 2, 1975-87.
Population Estimates
Estimates
Population
Numbers
95%
C1
95% CI
Numbers
36,302,000
±56.1
±5!.5
±51 5
±44.5
±48.9
±5!.
±51.77
±5!.6
±51.6
±49.4
±42.6
±40.3
±59.2
±32.6
±48.8
±66.1
25,566,400
29,316,000
10,560,000
11,116,700
11,050,000
6,160,000
6,320,000
7,680,000
5,600,000
6,480,000
5,920,000
7,563,600
p..'
58
Biomass
Biomass Estimates
Estimates
Pounds
95%
Cl
Pounds
95% CI
5,084,200
5,217,200
4,969,000
4,136,800
3,459,900
4,252,500
2,569,700
4,424,900
5,042,100
3,528,700
4,708,200
4,350,600
6,507,400
N/A
N/A
N/A
N/A
±39.0
±33.2
±36.9
±30.4
±29.7
±54.2
±32.7
±50.0
±58.6
130
GAPER CLAM RECRUITMENT
-Ia-- NETARTS
30
YAQUINA BAY
w
cc
4
a
25
20
C')
U)
C)-'
'-0
4
-J
15
C)
10
5
1974
1976
1978
1950
1982
1984
1986
1988
YEAR
Figure 10.
10. Recruitment of gaper clams in
in Netarts and
and
Yaquina bays, 1975-87.
1975-87.