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May 23 through
June 5, 2005, Report No. 10
Oakdale
The Oakdale trap sampled 9 out
of 14 days between May 23 and June 5. A total of 86
juvenile Chinook were captured increasing the season total
to 187,752. Daily catch fluctuated throughout the sampling
period and ranged from 5 to 15 Chinook (Figure 1). Average
forklength was 91 mm and ranged from 71 mm to 108 mm.
Average weight for captured Chinook was 8.9 g and ranged
from 4.2 g to 14.8 g.
Average forklength increased
by 8 mm and average weight increased by more than 1.5 g
since the previous sampling period (i.e., May 9 to May 22).
Similar increase in size was observed in previous years.
Figure 1. Chinook
Catch at Oakdale versus flow at Orange Blossom Bridge.
Three juvenile
O.mykiss were
captured during the sampling period increasing the season
total to 24 at Oakdale. Refer to Table 1 below for data
collected from each O.
mykiss captured.
Table 1.
Date, forklength, weight and
smolt index
(SI) of
O. mykiss
captured at Oakdale between May 23 and June 5, 2005.
| Date |
Organism Code |
Forklength (mm) |
Weight (g) |
Smolt Index1 |
Count |
| 06/02/05 |
RBT |
80 |
6.0 |
3 |
1 |
| 06/04/05 |
RBT |
48 |
1.2 |
2 |
1 |
| 06/04/05 |
RBT |
49 |
1.1 |
2 |
1 |
1Smolt index rating scale:
1-Sac-fry; 2-Fry; 3-Parr; 4-Silvery Parr; 5-Smolt; 6-Adult
Due to low numbers of natural
Chinook, no trap efficiency releases were conducted during
the sampling period.
Caswell
The Caswell traps sampled
9 out of 14 days between May 23 and June 5.
A total of 122
juvenile Chinook were captured increasing the season total
to 25,261.
Daily catch ranged from 3 to 27 Chinook (Figure 2).
Average forklength was 93 mm and ranged from
80 mm to 113 mm.
Average weight for captured Chinook was
8.8 g and
ranged from 2.6 g to 17.8 g.
Average forklength increased by 5 mm and average
weight increased by only 0.1 g over the previous sampling
period (i.e., May 9
to May 22).
No O.
mykiss were captured during the
sampling period.
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 began to decrease on May 30 marking the end of the
Vernalis Adaptive Management Plan (VAMP).
Post-VAMP flow releases are being 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 55° F at Oakdale and between 60°
F and 62° F at Caswell. Turbidity ranged from 1.4 NTU to 3.9
NTU at Oakdale and from 1.9 NTU to 5.8 NTU at Caswell. During
the sampling period, flow releases from GDW ranged between 839
cfs and 1,507 cfs. Flows at Orange Blossom Bridge (OBB; RM
46.9) ranged from 777 cfs to 1,435 cfs and Ripon (RIP; RM
15.8) ranged from 1,025 cfs to 1,531 cfs.
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