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June 12
through June 25, 2006, Report No.
11
Oakdale:
Between June 12 and June 25,
the Oakdale rotary screw trap sampled
10 out of 14 days. A
total of 794 juvenile Chinook salmon were captured between
June 12 and June 25, increasing the season total to 54,953
(Figure 1). Daily catch ranged from eight to 141 Chinook.
Average forklength was 84.4 mm and ranged from 65 mm to 112
mm. Average weight for captured Chinook was 7.1 g and
ranged from 6.5 g to 8.0 g. No coded-wire tagged (CWT)
Chinook were captured during the sampling period.
Figure 1. Chinook
Catch at Oakdale versus Stanislaus River flow at Orange Blossom Bridge
(OBB).
Five young-of-the-year
O. mykiss were
captured during the sampling period increasing the season
total to 42 (Table 1).
Table 1. Biosampling data
collected on O. mykiss captured at Oakdale between
June 12 and
June 25, 2006.
|
Date |
Forklength (mm) |
Weight (g) |
Smolt Index |
|
6/12/06 |
74 |
4.6 |
3 |
|
6/12/06 |
66 |
3.4 |
2 |
|
6/12/06 |
83 |
6.8 |
3 |
|
6/17/06 |
70 |
4.1 |
3 |
|
6/23/06 |
92 |
9.0 |
3 |
One trap efficiency test was
conducted at Oakdale on June 16 using Chinook from Merced
River Hatchery with a resulting efficiency of 4.1% (Table 2).
Table 2. Trap efficiency
tests conducted at Oakdale between June 12 and June 25,
2006.
|
Location |
Date |
Mark |
Number released |
Number recaptured |
Mean Length @ Release(mm) |
Mean Length @ Recapture (mm) |
Estimated
Efficiency |
Flow (cfs)
at RIP |
|
Oakdale |
6/16/06 |
TCG |
98 |
4 |
83.1 |
79.0 |
4.1% |
1,407 |
An adult Pacific lamprey
(465 mm) was captured in the Oakdale trap on June 13,
2006 (Figure 2).
Figure 2. An
adult Pacific lamprey captured at Oakdale on June 13, 2006.
Caswell:
The Caswell rotary screw traps
sampled nine out of 14 days between June 12 and June 25. A
total of 102 juvenile Chinook salmon were captured,
increasing the season total to 1,576 (Figure 2). Daily
catch ranged from zero to 27 Chinook. Average forklength
was 89.3 mm and ranged from 77 mm to 97 mm. Average weight
for captured Chinook was 8.0 g and ranged from 7.3 g to 9.0
g.
No coded-wire tagged (CWT)
Chinook were captured during the sampling period.
Figure 3. Chinook
Catch at Caswell versus Stanislaus River flow at Ripon (RIP).
No
O. mykiss
or CWT fish were captured at Caswell during the sampling
period.
One trap efficiency test was
conducted at Caswell on June 13 using Chinook from Merced
River Hatchery with a resulting efficiency of 0.3% (Table 3).
Table 3. Trap efficiency
tests conducted at Caswell between June 12 and June 25,
2006.
|
Location |
Date |
Mark |
Number released |
Number recaptured |
Mean Length @ Release(mm) |
Mean Length @ Recapture (mm) |
Estimated
Efficiency |
Flow (cfs)
at RIP |
|
Caswell |
6/13/06 |
TCP |
1,518 |
4 |
84.7 |
84.8 |
0.3% |
1,774 |
Environmental Data:
Instantaneous water
temperature fluctuated between 51.0°F and 55.0°F at Oakdale
and between 57.5°F and 61.9°F at Caswell. Turbidity ranged
from 0.7 NTU to 2.6 NTU at Oakdale and from 1.6 NTU to 4.0
NTU at Caswell. During the sampling period, releases from
Goodwin Dam (GDW) ranged between 1,501 cfs and 1,520 cfs.
Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged from
1,397 cfs to 1,477 cfs and at Ripon (RIP; RM 15.8) from
1,639 cfs to 1,814 cfs.
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