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May 29
through June 11, 2006, Report No.
10
Oakdale:
Between May 29 and June 11,
the Oakdale rotary screw trap sampled
nine days beginning on June 2 when the trap was
reinstalled following repairs. A total of 1,674 juvenile
Chinook salmon were captured between June 3 and June 11,
increasing the season total to 54,159 (Figure 1). Daily
catch ranged from 109 to 392 Chinook. Average forklength
was 83.7 mm and ranged from 38 mm to 108 mm. Average weight
for captured Chinook was 4.3 g and ranged from 0.5 g to 7.4
g.
Figure 1. Chinook
Catch at Oakdale versus Stanislaus River flow at Orange Blossom Bridge
(OBB).
30 young-of-the-year O.
mykiss were captured during the sampling period
increasing the season total to 37 (Table 1).
Table 1. Biosampling data
collected on O. mykiss captured at Oakdale between May
29 and
June 11, 2006.
|
Date |
Forkength (mm) |
Weight |
Smolt Index |
|
Date |
Forklength (mm) |
Weight |
Smolt Index |
|
6/3/06 |
63 |
2.7 |
3 |
|
6/6/06 |
67 |
4.1 |
3 |
|
6/3/06 |
65 |
3.0 |
3 |
|
6/6/06 |
62 |
4.0 |
3 |
|
6/3/06 |
68 |
3.0 |
3 |
|
6/6/06 |
57 |
2.2 |
3 |
|
6/3/06 |
60 |
2.4 |
3 |
|
6/6/06 |
70 |
4.1 |
3 |
|
6/3/06 |
54 |
1.3 |
3 |
|
6/7/06 |
53 |
- |
2 |
|
6/3/06 |
42 |
1.1 |
2 |
|
6/7/06 |
39 |
- |
2 |
|
6/3/06 |
61 |
2.7 |
3 |
|
6/7/06 |
50 |
- |
2 |
|
6/3/06 |
57 |
2.1 |
2 |
|
6/7/06 |
67 |
- |
3 |
|
6/4/06 |
55 |
2.1 |
3 |
|
6/8/06 |
76 |
5.3 |
3 |
|
6/4/06 |
66 |
3.4 |
3 |
|
6/8/06 |
54 |
1.7 |
3 |
|
6/4/06 |
63 |
2.8 |
3 |
|
6/8/06 |
58 |
2.3 |
3 |
|
6/4/06 |
36 |
1.0 |
2 |
|
6/8/06 |
64 |
2.8 |
3 |
|
6/5/06 |
52 |
1.7 |
2 |
|
6/8/06 |
68 |
3.5 |
3 |
|
6/5/06 |
72 |
4.3 |
3 |
|
6/9/06 |
65 |
2.8 |
3 |
|
6/5/06 |
40 |
0.7 |
2 |
|
6/11/06 |
92 |
9.1 |
3 |
No trap efficiency tests were
conducted at Oakdale during the sampling period.
Caswell:
The Caswell rotary screw traps
sampled 13 out of 14 days between May 29 and June 11. A
total of 512 juvenile Chinook salmon were captured,
increasing the season total to 1,474 (Figure 2). Daily
catch ranged from eight to 73 Chinook. Average forklength
was 89.4 mm and ranged from 75 mm to 120 mm. Average weight
for captured Chinook was 8.0 g and ranged from 7.2 g to
8.6
g.
Figure 2. Chinook
Catch at Caswell versus Stanislaus River flow at Ripon (RIP).
One
O. mykiss (206
mm; 93.5 g; SI 5) was captured on June 1 increasing the
season total to two.
Figure 3. A 206
mm O. mykiss captured at the Caswell rotary
screw traps on June 1, 2006.
One trap efficiency test was
conducted at Caswell on May 31 using Chinook from Merced
River Hatchery with a resulting efficiency of 0.3% (Table 2).
Table 2. Trap efficiency
tests conducted at Caswell between May 29 and June 11,
2006.
|
Location |
Date |
Mark |
Number released |
Number recaptured |
Mean Length @ Release(mm) |
Mean Length @ Recapture (mm) |
Estimated
Efficiency |
Flow (cfs)
at RIP |
|
Caswell |
5/31/06 |
TCP |
706 |
2 |
90.6 |
102.0 |
0.3% |
3,072 |
Smolt Survival
Release:
The California Department of
Fish and Game released 75,000 coded-wired tagged (CWT)
Merced River Hatchery Chinook at Knight's Ferry on April 28
to evaluate survival in the lower Stanislaus River. Between
May 29 and June 11, a total of 19 CWT fish (daily range: 0
to 5) were recaptured at Oakdale (14.2
river miles downstream of release site; Figure4) and 18
(daily range: 0 to 4) were recaptured at Caswell (45.7 river
miles downstream of release site; Figure 5) (note: catch
scales between figures are not the same). This brings the
season total of CWT fish to
462 for Oakdale and 24 for
Caswell.
Figure 4.
CWT Catch at Oakdale
versus Stanislaus River flow at Orange Blossom Bridge (OBB).
Figure 5.
CWT Catch at Caswell
versus Stanislaus River flow at Ripon (RIP).
Environmental Data:
Instantaneous water
temperature fluctuated between 50.0°F and 54.0°F at Oakdale
and between 55.5°F and 61.0°F at Caswell. Turbidity ranged
from 0.5 NTU to 1.6 NTU at Oakdale and from 1.6 NTU to 9.1
NTU at Caswell. During the sampling period, releases from
Goodwin Dam (GDW) ranged between 1,501 cfs and 2,914 cfs.
Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged from
1,476 cfs to 2,760 cfs and at Ripon (RIP; RM 15.8) from
1,805 cfs to 3,341 cfs.
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