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February 19 through
March 11, 2007, Report No.
2
Waterford:
A total of
674 juvenile Chinook salmon were captured between February
19 and March 11 increasing the season total to 1,425. Daily catch ranged from
1 to 183 Chinook (Figure
1). Average forklength was 54.1 mm and ranged from 29 mm to
140 mm. Average weight was 2.9 g and ranged from 0.1 g to
33.6 g.
One O. mykiss (195 mm FL; 74.2 g) was captured in the rotary screw trap
on February 20 increasing the season total to two.
Figure 1. Chinook
salmon catch at Waterford versus flow at La Grange (LGN).
Three trap efficiency tests were conducted at Waterford
(March 3,
March 5, and March 10) with resulting efficiencies of 7.1%, 4.0%, and
7.2%, respectively
(Table 1).
Table 1. 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) |
|
3/3/07 |
98 |
7 |
7.1% |
46.4 |
48.6 |
340 |
1.41 |
|
3/5/07 |
75 |
3 |
4.0% |
56.2 |
59.7 |
341 |
0.62 |
|
3/10/07 |
150 |
13 |
7.2% |
38.1 |
36.6 |
340 |
0.35 |
Environmental Data:
Instantaneous water temperature taken at the Waterford trap
ranged between 55°F and 58°F; turbidity ranged from
0.32 NTU to 2.40 NTU; and flows at La Grange ranged between
340 cfs and 342 cfs.
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