HABITAT IMPROVEMENT
PROJECT
Fishery Division
osSIN 571r
-41141.411.94
SAME COMMISSION
OREGON STATE GAME COMMISSION
P. O. BOX 3503
PORTLAND, OREGON 97208
Umpqua River Research
(Winchester Segment)
1966 - 1967
Number 24
STATE OF OREGON
Oregon State Game Commission
Fishery Division
Co J. Campbell
Chief of Operations
Umpqua River Research
(Winchester Segment)
FEDERAL AID TO FISH RESTORATION PROJECT
Project F-75-R-2
By
Jerry A. Bauer
District Fishery Biologist
Umpqua River Research
(Winchester Segment)
1966 - 1967
Number 24
UMPQUA RIVER RESEARCH
(Winchester Segment)
ABSTRACT
Fish passing Winchester Dam view-window counting station on the
North Umpqua River were enumerated.
and denotes the counting station.
Figure 1 is a map of the Umpqua basin
The counts for summer steelhead, fall
chinook, and sea-run cutthroat increased while those for winter steelhead,
spring chinook, and coho decreased.
By far the greater number of fish
again passed through the station from Noon to 8 p.m.
The contribution of
the hatchery and rearing pond programs to the anadromous fishery was demonstrated by the numbers of marked fish returning (1008 and 6700 percent of
each run).
Substantially higher returns from March releases over fish
stocked in either April or May is indicated.
METHODS
A statistical sampling program developed at Oregon State University
was followed with five of the twenty-one periods counted each week.
Within each enumeration period, fish passing the view-window were
identified, examined for Marks, and recorded.
DISCUSSION
Six species, and/or races of anadromous fish and three species of
coarse fish were counted through the station.
Table 1 presents the number
of fish tabulated through the station and the projected total for each
species.
A comparison of data obtained for 1965-1966 is also listed.
The
count for sea-run cutthroat was the highest recorded at the station since
its beginning in 19450
FIGURA.
.2-
1
Table 1
Counts and Projected Totals of Fish Passing
Winchester Dam
July 1, 1965 - June 30, 1967
Fish Counted
1966=67
Species
1965-66
Projected Totals
1965-66
1966-67
Spring chinook
3,276
2,826
11,730
7,407
Summer steelhead
3,227
25191
5,428
5,956
430
750
796
2,364
79
82
182
302
975
266
2,262
917
6,726
39363
9,935
89589
38
6
60
21
20,526
38,896
549145
87,441
1,930
4,402
6,257
11,498
18,732
11,319
53,642
23,283
Sea-run cutthroat
Fall chinook
Coho
Winter steelhead
Miscellaneous trout
Suckers
Squawfish
Lamprey
The study to determine time and rate of fish movement through the
station within a 24-hour period again demonstrated that the majority pass in
the afternoon (Noon to 8 p.m.).
Table 2 shows the results obtained in 1966
and 1967.
A total of 3,329 spring chinook was examined at Winchester Counting
Station with 842 marked fish observed.
The number of fish examined for marks
will vary from that listed for total fish counted because the selection of
brood stock and examination for marks does not always occur within the established statistical sampling period.
The marked fish originated from the Rock
Creek Hatchery and Whistler's Bend Rearing Pond.
There were 2,736 summer
Table 2
Rate of Movement Through Winchester Counting Station
July 1965 - June 1967
Species
4 a.m.
1966
Percent of run passing by time period
B p.m. - 4 a.m.
Noon - 8 p.m.
- Noon
1967
1966
1967
1966
1967
Spring chinook
22
20
59
59
19
21
Fall chinook
38
43
44
36
18
21
Summer steelhead
32
37
54
52
14
11
Winter steelhead
13
13
80
82
7
5
Coho
22
33
40
45
38
22
Sea-run cutthroat
34
25
40
53
26
22
steelhead examined with 1,126 fish with excised fins.
Hatchery operations
contributed substantially to the record run of sea-run cutthroat, as 454
marked fish were observed in the 750 fish examined.
The cutthroat released
in March returned at the ratio of 26 to 1 over fish released in May.
3,363 winter steelhead examined, 343 were of hatchery origin.
Approximately
68 percent of the marked winter-run fish were of the summer race.
depicts the percent of fish marked by species.
tion of hatchery fish by brood year.
Of the
Table 3
Table 4 lists the contribu-
Table 3
Results of Fish Examined for Marks at Winchester Dam
July 1966 - June 1967
Species
Number
of Fish
Examined
Spring chinook
3,329
842
1,995
7,407
26.9
Summer steelhead
2,736
1 126
3,024
5,956
5008
750
474
19584
29364
67.0
39363
343
930
8,589
10.8
Sea-run cutthroat
Winter steelhead
Number
of Marks
Observed
Projected
Marks in
Total Run
Total
Run
Marked
Percent
of Run
Table 4
Contribution '7,_31- Brood Year of Marked Fish
July 1966 - June 1967
Percent by Brood Year
Run and Species
61
1962
63
1964
1965
3706
33.7
5206
34.6
9.8
31.7
Winter Steelhead:
StS Stock
StW Stock
58,6
43.7
40.6
14.6
0.8
41.7
Cutthroat:
Sea-run Stock
3.9
2.5
93.6
30.0
24.7
43.3
1
1
Summer Steelhead;
StS Stock
StW Stock
Spring Chinook:
Spring Stock
Period Covered:
008
1.2
July 1, 1966 through June 309 1967
Financial Reports
Project Approval:
Actual Expenditures:
5
$8,500
$79561088