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January 30 - February 19, 2006, Report No.
2
Oakdale:
A total of 26,694
juvenile Chinook salmon were captured between January 30 and
February 19 (Figure 1). Daily catch ranged from 50 to 3,110
Chinook. Individual forklengths ranged from 30 mm to 53 mm
and daily mean lengths ranged from 33.6 mm to 36.1 mm.
Average weight for captured Chinook was 0.4 grams.
Figure 1. Chinook
Catch at Oakdale versus flow at Orange Blossom Bridge.
Three yearling Chinook
were captured during this sample period. Forklengths ranged
from 120 mm to 146 mm and average yearling weight was 27.5
g. The yearlings were not included in the total catch or in
the calculations for mean length or weight.
Figure 2. From left to right: Yearling Chinook salmon
captured at the Oakdale screw trap on February 5th
(FL: 120 mm; W: 19.5 grams); conjoined Chinook salmon twins
captured at the Oakdale screw trap on February 6th.
Two O. mykiss were also captured in the rotary screw
trap during this sample period. Forklengths were 244 mm and
266 mm and respective weights were 164.8 g and 233.5 g.
Two trap efficiency tests were conducted at Oakdale
(February 7 and February 14) with resulting
efficiencies of 7.47% and 1.87%, respectively (Table 1).
Table 1. Release
and recapture data for trap efficiencies conducted at
Oakdale.
|
Date |
# Released |
# Recaptured |
Trap Efficiency |
Mean Length @ Release (mm) |
Mean Length @ Recapture (mm) |
Turbidity (NTU) |
Flow @ OBB* |
|
2/7/06 |
1,031 |
77 |
7.47% |
33.5 |
35.3 |
0.62 |
1,591 |
|
2/14/06 |
1,016 |
19 |
1.87% |
35.2 |
35.8 |
1.08 |
1,680 |
Caswell:
Caswell (RM 8.6) screw traps are scheduled to be installed
on March 7 and sampling will commence
immediately.
Environmental Data:
Instantaneous water temperature taken at the Oakdale screw
trap ranged between 47°F and 50°F. Turbidity at Oakdale
ranged from 0.6 NTU to 2.6 NTU. During the sampling period
releases from Goodwin Dam ranged between 1,800 cfs and 1,810
cfs. Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged
from 1,569 cfs and 1,688 cfs and at Ripon (RIP; RM 15.8)
from 1,842 cfs and 1,963 cfs |
