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March 6 through March 19, 2006, Report No.
4
Waterford:
A total of 980 juvenile
Chinook salmon were captured at Waterford between March 5
and March 19, increasing the season total to 7,759. Daily
catch ranged from 33 to 112 Chinook (Figure 1). Average forklength was 38.2 mm and ranged from 30 mm to 105 mm.
Average weight was 1.9 g and ranged from 0.2 g to 12.3 g.
Figure 1. Chinook
salmon catch at Waterford versus flow at La Grange (LGN).
One yearling Chinook salmon (147 mm; 39.6 g) was captured at the Waterford
site during this sample period, but was not included in the
total catch or in calculations for mean length or weight.
Figure 2.
Yearling Chinook salmon, FL: 147mm, captured
at Waterford on March 9th.
No O. mykiss were captured in the rotary screw
trap during this sampling period.
No trap
efficiency tests were conducted at Waterford during this
sample period due to low catch numbers.
Grayson:
A total of 120 juvenile
Chinook salmon were captured at Grayson between March 6 and
March 19, increasing the season total to 1,314. Daily catch
ranged from 0 to 25 Chinook (Figure 3). Average forklength
was 38.9 mm and ranged from 32 mm to 82 mm. Average weight
was 1.4 g and ranged from 0.2 g to 5.3 g.
Figure 4. Chinook
salmon catch at Grayson versus flow at Modesto (MOD).
Two yearling Chinook salmon were captured at the Grayson
site during this sample period, but were not included in the
total catch or in calculations for mean length or weight.
Yearling forklengths were 125 mm and 136 mm, and weights
were 21.9 g and 27.4 g, respectively.
Figure 3.
Yearling Chinook salmon, FL: 125mm, captured
at Grayson on March 15th.
No O.
mykiss were captured in the rotary screw trap during
this sampling period.
No trap efficiency tests were conducted at Grayson during
this sample period due to low catch numbers.
Environmental Data:
Instantaneous water temperature ranged between 49.0°F and
50.8°F at the Waterford trap, and 49.0°F and 52.5°F at
Grayson. Turbidity fluctuated between 1.5 NTU and 2.7 NTU
at Waterford, and from 1.7 NTU and 4.4 NTU at Grayson.
During the sampling period, flows at La Grange ranged
between 3,029 cfs and 4,998 cfs, while flows at Modesto
ranged between 4,019 cfs and 5,137 cfs.
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