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June 6 through
June 16, 2005, Report No. 11
Oakdale
A total of 110 juvenile
Chinook were captured between June 6 and June 16 increasing
the season total to 187,862. Daily catch fluctuated
throughout the sampling period and ranged from 0 to 22
Chinook (Figure 1). Average forklength was 91 mm and ranged
from 71 mm to 117 mm. Average weight for captured Chinook
was 8.7 g and ranged from 4.6 g to 19.9 g.
No O. mykiss
were captured during the sampling period.
Average forklength did not
change since the previous sampling period (i.e., May 23 to
June 5);
however,
average weight decreased by 0.2 g. Sampling was terminated
for the season at Oakdale on June 16 due to consistently low
catch during the past several weeks.
Figure 1. Chinook
Catch at Oakdale versus flow at Orange Blossom Bridge.
No trap efficiency releases
were conducted at Caswell during the sampling period due to
low catch of natural Chinook.
Caswell
A total of 150
juvenile Chinook were captured increasing the season total
to 25,411.
Daily catch ranged from 0 to 30 Chinook (Figure 2).
Average forklength was 94 mm and ranged from
75 mm to 124 mm.
Average weight for captured Chinook was
9.3 g and
ranged from 5.4 g to 22.0 g.
No O.
mykiss were captured during the
sampling period.
Average forklength
increased by 1 mm and average weight increased by 0.5
g over the previous sampling period
(i.e., May 23 to
June 5).
Sampling was terminated for
the season at Caswell on June 16 due to consistently low
catch during the past several weeks.
Figure 2. Chinook
Catch at Caswell versus flow at Ripon.
No trap efficiency releases
were conducted at Caswell during the sampling period due to
low catch of natural Chinook.
Environmental Data
Environmental conditions
fluctuated during the sampling period as releases at Goodwin
Dam continued to decrease from the Vernalis Adaptive
Management Plan (VAMP) period.
Post-VAMP flow releases were ramped down from 1,500 cfs to 300
cfs at a rate of 100 cfs per day over a twelve day period
ending on June 10. Instantaneous temperature
fluctuated between 54° F and 62° F at Oakdale and between 61°
F and 70° F at Caswell. Turbidity ranged from 1.5 NTU to 4.3
NTU at Oakdale and from 2.6 NTU to 4.8 NTU at Caswell. During
the sampling period, flow releases from GDW ranged between 734
cfs and 252 cfs. Flows at Orange Blossom Bridge (OBB; RM
46.9) ranged from 345 cfs to 617 cfs and Ripon (RIP; RM 15.8)
ranged from 394 cfs to 944 cfs.
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