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September
25 through October 8, 2006
A total of 195 Chinook passed
upstream of the weir between September 25 and October 8
increasing the season total to 243.
Daily Chinook passage counts ranged from three to 57. Other fish species observed
included striped bass,
Sacramento blackfish, Sacramento pikeminnow, Sacramento sucker,
carp, and black bass
(Figure 1).
Figure 1. A 710 mm Chinook
(left), Sacramento pikeminnow (middle), and striped bass (right)
passing the weir on October 6.
A total of 14 ad-clipped Chinook (i.e., indicating presence of
coded wire tag) passed upstream of the weir during the sampling
period. Forklengths ranged from 567 mm to 1,008 mm (avg =
810 mm; Figure 2; Table 1).
Figure 2. Photo (top) and Vaki silhouette
(bottom) of 735 mm ad-clipped Chinook passing the weir on
October 5, 2006.
Table 1. Date, total length and sex of
ad-clipped Chinook passing upstream of the weir between
September 25 and October 8, 2006.
|
Date |
Total Length (mm) |
Sex |
Date |
Total Length (mm) |
Sex |
|
9/25 |
882 |
F |
10/4 |
882 |
F |
|
9/28 |
1,008 |
M |
10/4 |
865 |
F |
|
9/28 |
974 |
M |
10/5 |
722 |
F |
|
9/30 |
802 |
F |
10/5 |
760 |
F |
|
10/2 |
567 |
M |
10/5 |
735 |
M |
|
10/2 |
760 |
F |
10/5 |
735 |
M |
|
10/3 |
937 |
M |
10/7 |
710 |
F |
Environmental conditions
fluctuated at the weir site during the sampling period. Flow
at Orange Blossom Bridge (OBB) ranged from 1,266 cfs to 1,321 cfs;
turbidity ranged between 0.5 NTU and 2.0 NTU; and dissolved oxygen
(DO) ranged between 9.9 mg/L and 10.2 mg/L. DO at Rough 'n Ready Island (RRI)
in the San Joaquin River's Deep Water Ship Channel ranged from 6.8 mg/L to
7.8 mg/L.
Daily instantaneous water temperature at the Stanislaus River
weir ranged from 54.1ºF to 56.4ºF.
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