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May 29 through June 11, 2006, Report No.
10
Waterford:
The Waterford rotary screw
trap sampled 11 out of 14 days between May 29 and June 11.
A total of 73 juvenile Chinook salmon were captured,
increasing the season total to 8,505. Daily catch ranged
from zero to 27 Chinook (Figure 1). Average forklength was
93.0 mm and ranged from 66 mm to 90 mm. Average weight was
9.5 g and ranged from 5.9 g to 11.4 g.
Figure 1. Chinook
salmon catch at Waterford versus flow at La Grange (LGN).
Four
O. mykiss were
captured in the rotary screw trap during this sampling
period increasing the season total to six (Table 1).
Figure 2. An 81
mm O. mykiss captured at Waterford on June 2, 2006.
Table 1. Biosampling data
collected on O. mykiss captured between May 29 and
June 11, 2006.
|
Location |
Date |
Species |
Forklength (mm) |
Weight |
Smolt Index |
|
Waterford |
6/2/06 |
O. mykiss |
81 |
5.5 |
3 |
|
Waterford |
6/3/06 |
O. mykiss |
66 |
3.1 |
3 |
|
Waterford |
6/10/06 |
O. mykiss |
90 |
8.9 |
3 |
|
Waterford |
6/10/06 |
O. mykiss |
80 |
5.9 |
3 |
Two trap efficiency tests were
conducted at Waterford on June 3 and June 9 using Chinook
from the Merced River Hatchery with a resulting efficiency
of 0.03% and 0.0%, respectively (Table 2).
Table 2. Trap efficiency
tests conducted at Waterford between May 29 and June 11,
2006.
|
Location |
Date |
Mark |
Number released |
Number recaptured |
Mean Length @ Release(mm) |
Mean Length @ Recapture (mm) |
Estimated
Efficiency |
Flow (cfs)
at LGN |
|
Waterford |
6/3/09 |
TCO |
2,948 |
1 |
79.3 |
80.0 |
0.03% |
3,385 |
|
Waterford |
6/9/06 |
TCO |
2,731 |
0 |
84.9 |
- |
0.0% |
4,716 |
Grayson:
The Grayson rotary screw traps
sampled 11 out of 14 days between May 29 and June 11. A
total of 54 juvenile Chinook salmon were captured,
increasing the season total to 1,556. Daily catch ranged
from zero to nine Chinook (Figure 3). Average forklength
was 95.3 mm and ranged from 64 mm to 117 mm. Average weight
was 10.1 g and ranged from 6.2 g to 14.0 g.
Figure 3.
Chinook salmon catch at Grayson versus flow at Modesto (MOD).
No
O. mykiss were
captured in the rotary screw trap during this sampling
period.
One trap efficiency test was
conducted at Grayson on June 1 using Chinook from the Merced
River Hatchery with a resulting efficiency of 0.0% (Table 3).
Table 3. Trap efficiency
test conducted at Grayson between May 29 and June 11,
2006.
|
Location |
Date |
Mark |
Number released |
Number recaptured |
Mean Length @ Release(mm) |
Mean Length @ Recapture (mm) |
Estimated
Efficiency |
Flow (cfs)
at MOD |
|
Grayson |
6/1/06 |
TCY |
1,694 |
0 |
91.6 |
- |
0.0% |
4,764 |
Environmental Data:
Instantaneous water
temperature ranged between 53.0°F and 58.0°F at Waterford,
and between 58.1°F and 61.7°F at Grayson. Turbidity
fluctuated between 0.8 NTU and 2.2 NTU at Waterford, and
from 1.6 NTU to 4.0 NTU at Grayson. During the sampling
period, flows at La Grange ranged between 2,656 cfs and
5,790 cfs, while flows at Modesto ranged between 3,058 cfs
and 5,780 cfs.
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