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 November
20 through December 3, 2006
A total of 151 Chinook passed
upstream of the weir between November 20 and December 3
increasing the season total to 2,772. Chinook daily passage
counts ranged from 0 to 27 fish. Total-lengths ranged from 441 mm to 1058 mm (avg = 731 mm). Other fish species observed
included multiple Sacramento sucker, one Sacramento
pikeminnow, and one Sacramento blackfish.
Figure 1.
Adult Chinook Passage at the Stanislaus River weir, 2003 to
2006.
No ad-clipped Chinook (i.e.,
indicating presence of coded wire tag) passed upstream of
the weir during this sample period.
Livebox trapping continued
during this sample period. Eight Chinook were captured,
processed, and released in good condition upstream of the
weir during this sample period (Figure 2).
Figure 2.
Fisheries Technician Michael Justice holding a female Chinook salmon captured on November 20.
We recovered seven spawned out
Chinook carcasses (all male) during this sample period
(Figure 3). All carcasses were processed and then passed
downstream of the weir.
Figure 3.
A spawned out male Chinook carcass (Depth: 170mm, TL: 760mm)
found on November 21.
No
O. mykiss passed
the weir during this sample period.
Environmental
conditions fluctuated at the weir site during the sampling
period. Flow at Orange Blossom Bridge (OBB) ranged from 551
cfs to 560 cfs, and flow at Ripon (RIP) ranged from 597 cfs
to 622 cfs. Turbidity ranged between 0.22 NTU and 1.0 NTU;
and dissolved oxygen (DO) ranged between 9.34 mg/L and 11.28
mg/L. DO at Rough 'n Ready Island (RRI) in the San Joaquin
River's Deep Water Ship Channel ranged from 8.00 mg/L to
9.00 mg/L. Daily instantaneous water temperature at the
Stanislaus River weir ranged from 48.8ºF to 54.6ºF.
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