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July
10
through July14, 2006, Report No.
13
Oakdale:
Between July 10 and July 14,
the Oakdale rotary screw trap sampled
four out of five
days. A total of 43 juvenile Chinook salmon were
captured, increasing the season total to 55,163 (Figure 1).
Daily catch ranged from seven to 14 Chinook. Average
forklength was 88.6 mm and ranged from 69 mm to 105 mm.
Average weight for captured Chinook was 7.7 g and ranged
from 5.3 g to 9.8 g.
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 56 (Table 1).
Table 1. Biosampling data
collected on O. mykiss captured at Oakdale between
July 10 and
July 14, 2006.
|
Date |
Forklength (mm) |
Weight (g) |
Smolt Index |
|
7/11/06 |
98 |
11.4 |
4 |
|
7/11/06 |
90 |
8.7 |
3 |
|
7/12/06 |
85 |
6.7 |
3 |
|
7/12/06 |
64 |
2.8 |
3 |
|
7/14/06 |
78 |
5.2 |
3 |
No trap efficiency tests
were
conducted at Oakdale during the sampling period.
Sampling was terminated for
the season on July 14 due to consistently low Chinook
catch. The trap was removed from the river on July 19. The
Oakdale trap will undergo some safety modifications during
the off-season, as well as replacement of floatation
material in the pontoons.
Caswell:
The Caswell rotary screw traps
sampled four out of five days between July 10 and July 14.
Zero juvenile Chinook salmon were captured during the
sampling period (Figure 2).
Figure 2. Chinook
Catch at Caswell versus Stanislaus River flow at Ripon (RIP).
No
O. mykiss
were captured at Caswell during the sampling
period.
Sampling at Caswell was also
terminated on July 14 due to several days in a row of zero
Chinook catch. The Caswell
traps were removed from the river on July 20
(Figure 3). We would like to thank South San Joaquin
Irrigation District (SSJID) for assisting with trap removal
again this year.
Figure 3.
SSJID's
boom truck removing the Caswell traps from the Stanislaus
River on July 20.
Environmental Data:
Instantaneous water
temperature fluctuated between 55.4°F and 56.2°F at Oakdale
and between 62.0°F and 62.6°F at Caswell. Turbidity ranged
from 0.6 NTU to 1.4 NTU at Oakdale and from 2.2 NTU to 3.4
NTU at Caswell. During the sampling period, releases from
Goodwin Dam (GDW) ranged between 1,206 cfs and 1,209 cfs.
Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged from
1,108 cfs to 1,166 cfs and at Ripon (RIP; RM 15.8) from
1,257 cfs to 1,333 cfs.
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