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 October
23 through November 5,
2006
A total of 984 Chinook passed upstream of the weir between
October 23 and November 5 increasing the season total to
1494. The
season total has jumped by almost 3x in the last two week
period. Chinook
daily passage counts ranged from 8 to158 fish. Total-lengths ranged from 399 mm to 1071 mm (avg
= 748 mm). Other fish species observed included
Striped bass,
Sacramento sucker, Sacramento pikeminnow, black bass, and
most notable, two Chum salmon.
Figure 1.
Adult Chinook Passage 2003 to 2006.
Three O.mykiss
passed the weir
during this sample period. The first one that passed on
10/25 at 12:39 pm had a depth of 127 mm and a total length
of 533 mm. The second one that passed on 10/30 at 12:51 pm
had a depth of 123 mm and a total length of 517 mm. The
third one that passed on 11/05 at 10:03 pm had a depth of 90
mm and a total length of 379 mm. None of these fish were
ad-clipped.
  
Figure 2.
A 533 mm (depth: 127 mm) O.mykiss that passed
the weir on October 25 (left), a 517 mm (depth: 90 mm) O.mykiss
that passed the weir on October 30 (middle), and a 379 mm (depth:
90 mm) O.mykiss that passed the weir on November 5 (right). A total of
20 ad-clipped Chinook (i.e., indicating
presence of coded wire tag) passed upstream of the weir
during the sampling period. Total lengths ranged from 567
mm to 1025 mm (Table 1).
Table 1.
Date, total length and sex of ad-clipped Chinook passing
upstream of the weir between October 23 and November 5, 2006.
|
Date |
Total
Length (mm) |
Sex |
Date |
Total
Length (mm) |
Sex |
|
10/23 |
802 |
F |
10/28 |
865 |
M |
|
10/26 |
811 |
M |
11/1 |
685 |
F |
|
10/26 |
714 |
F |
11/1 |
785 |
F |
|
10/26 |
886 |
M |
11/1 |
567 |
F |
|
10/27 |
714 |
M |
11/1 |
617 |
U |
|
10/27 |
651 |
F |
11/1 |
584 |
F |
|
10/27 |
743 |
U |
11/1 |
727 |
M |
|
10/27 |
664 |
M |
11/2 |
958 |
F |
|
10/27 |
1025 |
M |
11/5 |
743 |
F |
|
10/27 |
714 |
F |
11/5 |
701 |
F |
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Two Chum salmon
passed the weir during this sample period. This is the
first time we have ever recorded a Chum salmon in the
Stanislaus River. The first Chum passed on October 30 at
2:49 pm and had a depth of 185 mm and a total length of 777
mm. The second fish passed on November 1 at 8:57 am and had
a depth of 187 mm and a total length of 785 mm.
Figure 3.
Photo (top) and
Vaki silhouette (bottom) of the first Chum salmon to pass the weir on
October 30.
Livebox trapping
also began during this period. Our first livebox trapping
period was from November 2 at 11:55 am through November 4 at
9:57 am. We captured 15 Chinook and were able to take scale
samples from 14 of them. All fish processed were handled
carefully and released in good condition.
Figure 4.
Fisheries
Technician Michael Justice holding a trapped fish from the
livebox.
Environmental conditions fluctuated at the weir site during
the sampling period. Flow at Orange Blossom Bridge (OBB)
ranged from 624 cfs to 1,302 cfs;
GDW (Goodwin Dam)
had a scheduled release change from 1200 CFS to 600 CFS from
October 30 thru November 1;
turbidity ranged between 0.17 NTU and 1.25 NTU; and dissolved oxygen (DO) ranged
between 9.64 mg/L and 11.04 mg/L. DO at Rough 'n Ready
Island (RRI) in the San Joaquin River's Deep Water Ship
Channel ranged from 8.10 mg/L to 9.20 mg/L.
Daily instantaneous water temperature at the Stanislaus
River weir ranged from 51.9ºF to 55.5ºF.
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