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January 16-29, 2006, Report No.
1
Oakdale:
Due to heavy rains
and flood control releases from Goodwin Dam, we could
not safely operate the Oakdale rotary screw trap (RM
40.1) during the first two weeks of January. Once flows
decreased below 5,500 cfs, the trap was installed on
January 16th, which is about two weeks later
than in previous years. Sampling commenced immediately
following installation and was conducted daily.
Figure 1. Oakdale rotary screw trap under a flow of
approximately 4,400 cfs at Goodwin Dam on January 17,
2006.
A total of 5,727
juvenile Chinook salmon were captured between January 16th
and January 29th (Figure 2). Daily catch
ranged from 111 to 802 Chinook. Individual forklengths
ranged from 30 mm to 64 mm and daily mean lengths ranged
from 35.2 mm to 37.1 mm. Average weight for captured
Chinook was 0.4 grams. A 127 mm yearling Chinook was
also captured on January 23rd but was not
included in the total catch or in the calculations for
mean length or weight.
Figure 2.
Chinook Catch at
Oakdale versus flow at Orange Blossom Bridge.
Zero O. mykiss
were captured in the rotary screw trap during this
sample period.
Two trap
efficiency tests were conducted at Oakdale (January 22
and January 29) with resulting efficiencies of 3.56%
and 3.08%, respectively (Table 1).
Table 1. Trap efficiency
tests conducted at Oakdale between January16 and January 29
2006.
|
Location |
Date |
Mark |
Number released |
Estimated
Efficiency |
Flow (cfs) |
|
Oakdale |
1/22/06 |
CFG |
477 |
3.56% |
1,747 |
|
Oakdale |
1/29/06 |
CFG |
487 |
3.08% |
1,572 |
Caswell:
At this point in time,
we are not sampling at Caswell (RM 8.6) due to insufficient
project funding. The Anadromous Fish Restoration Program (AFRP)
is currently trying to locate funds to continue this
monitoring effort. However, in the absence of AFRP funds,
this site will not be sampled in 2006.
Environmental
Data:
Instantaneous water
temperature taken at the Oakdale rotary screw trap ranged
between 48.6°F and 49.8°F. Turbidity at Oakdale ranged from
1.3 NTU to 2.7 NTU. During the sampling period releases
from Goodwin Dam ranged between 1,805 cfs and 5,022 cfs.
Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged from
1,569 cfs and 4,364 cfs and at Ripon (RIP; RM 15.8) from
1,973 cfs and 4,878 cfs.
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