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January 8-28, 2007, Summary
Postcard No.
1
Caswell:
The traps were
installed on January 9th at Caswell State Park (RM 8)
(Figure 1). We began intermittent sampling on January
10th at the same sampling site as previous years (Figure 2). We started sampling 7 days a week on January
22nd. We plan to continue sampling 7 days a week to increase
our sample size for coded-wire tagging (CWT) juvenile
Chinook and to
conduct almost daily trap efficiency tests.
  
Figure 1. Assembly, installation, and positioning of
Caswell rotary screw trap (RM 8).
Figure 2. Caswell rotary screw traps first day of
sampling, January 10th.
A total of 37
juvenile Chinook salmon were captured between January 9th
and January 28th. Daily catch ranged
from 0 to 11 Chinook. Individual forklengths
ranged from 29 mm to 39 mm. Mean length for
captured chinook during this sample period was 33.5 mm
and mean weight was 0.4 grams.
Zero O. mykiss
were captured in the rotary screw trap during this
sample period.
Trap
efficiency tests will be conducted when daily chinook catch
produces a sufficient sample size.
Coded-wire tagging (CWT):
The CWT mobile
laboratory (CWT trailer) will be finished and positioned at
Caswell on February 2nd. A third rotary screw trap
(Lower Trap) was installed about 300 yards below the
original Caswell trapping site (Figure 3). This trap
will be used to increase the number of Chinook caught at
Caswell and subsequently tagged. Jerry Big Eagle &
Associates will be assisting us during our tagging efforts
in February.
Please review the final
Detailed Study Plan for Coded Wire Tagging of Chinook Salmon
in The Stanislaus River
for more information on the
CWT study.
 
Figure 3. Caswell third trap located downstream of the
original Caswell trapping site.
In the lower
Caswell trap a total of 8
juvenile Chinook salmon were captured between January 9th
and January 28th. Daily catch ranged
from 0 to 6 Chinook. Individual forklengths ranged
from 29 mm to 35 mm. Mean length for captured
chinook during this sample period was 32.3 mm and mean weight was 0.3 grams.
Zero O. mykiss
were captured in the lower rotary screw trap during this
sample period.
Environmental
Data:
Instantaneous water
temperature taken at the Caswell rotary screw trap ranged
between 44.5°F and 47.6°F. Turbidity at Caswell ranged
from 0.7 NTU to 1.4 NTU. During the sampling period
releases from Goodwin Dam ranged between 1,010 cfs and 1,209 cfs.
Flows at Orange Blossom Bridge (OBB; RM 46.9) ranged from
793 cfs and 945 cfs and at Ripon (RIP; RM 15.8) from 1,010 cfs and
1,153 cfs.
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