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April 16 through
May 27, 2007, Report No.
4
Waterford:
A total of
1,004 juvenile Chinook salmon were captured between April 16 and
May 27 increasing the season total to 3,305. Daily catch ranged from
one to 253 Chinook (Figure
1). Average forklength was 82.4 mm and ranged from 62 mm to
108 mm. Average weight was 7.2 g and ranged from 4.4 g to
12.7 g.
Figure 1. Chinook
salmon catch at Waterford versus flow at La Grange (LGN).
Seven O.
mykiss were captured during the sampling period
increasing the season total to nine.
Please refer to
Table 1 for date of capture, length, weight, and smolt indices.
Table 1. Date of capture, length, weight, and smolt indices of
O. mykiss captured at Waterford between April 16 and May 27, 2007. Smolt index ratings are as follows: 1-sac-fry; 2-fry;
3-parr; 4-silvery parr; 5-smolt; and 6-adult.
|
Date |
Forklength (mm) |
Total Length (mm) |
Weight
(g) |
Smolt
Index |
Count |
|
4/22/2007 |
64 |
67 |
2.2 |
3 |
1 |
|
4/23/2007 |
43 |
45 |
0.8 |
2 |
1 |
|
4/27/2007 |
310 |
315 |
317.6 |
6 |
1 |
|
5/2/2007 |
35 |
36 |
0.3 |
2 |
1 |
|
5/3/2007 |
320 |
334 |
433.7 |
6 |
1 |
|
5/15/2007 |
360 |
375 |
621.7 |
6 |
1 |
|
5/18/2007 |
77 |
80 |
5.4 |
3 |
1 |
Two trap efficiency tests were conducted at Waterford
between April 16 and May 27 with resulting efficiencies of
4.8% and 5.3%, respectively
(Table 2).
Table 2. Release and recapture data for trap efficiency
releases conducted at Waterford.
|
Release Date |
# Released |
# Recaptured |
Trap Efficiency |
Mean at Release (mm) |
Mean at Recapture (mm) |
Flow at LGN (cfs) |
Turbidity (NTU) |
|
4/24/2007 |
63 |
3 |
4.8% |
81.9 |
80.3 |
869 |
0.82 |
|
4/26/2007 |
171 |
9 |
5.3% |
80.2 |
79.1 |
646 |
0.88 |
Eleven incidental
species were captured during the sampling period including
bluegill, golden shiner, hardhead, juvenile lamprey,
largemouth bass, prickly sculpin, riffle sculpin, red
shiner, Sacramento pikeminnow, Sacramento sucker, and white
catfish.
Instantaneous water temperature taken at the Waterford trap
ranged between 56°F and 70°F; turbidity ranged from
0.26 NTU to 3.02 NTU; and flows at La Grange ranged between
213 cfs and 875 cfs.
Grayson:
A total of
26 juvenile Chinook salmon were captured between April 16 and
May 27 increasing the season total to 27. Daily catch ranged from
zero to six Chinook (Figure
2). Average forklength was 83.6 mm and ranged from 76 mm to
91 mm. Average weight was 6.5 g and ranged from 5.1 g to
8.5 g.
Zero O.
mykiss were captured during the sampling period.
Figure 2.
Chinook salmon catch at Grayson versus flow at Modesto (MOD).
Fourteen incidental
species were captured during the sampling period including
bluegill, commmon carp, channel catfish, golden shiner,
hardhead, largemouth bass, mosquitofish, red shiner,
Sacramento pikeminnow, Sacramento sucker, smallmouth bass,
threadfin shad, warmouth, and white catfish.
Instantaneous
temperature taken at the trap ranged between 59°F and 77°F, and
turbidity ranged from 1.61 NTU to 6.14 NTU. Daily
average flow at Modesto (MOD) fluctuated between 437 cfs and
1,045 cfs.
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