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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:06:17 PM
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UCREFRP
UCREFRP Catalog Number
9566
Author
Miller, W. J., D. E. Rees and J. A. Ptacek.
Title
Final Report - Elkhead Reservoir Escapement Recovery Program Project No.
USFW Year
2005.
USFW - Doc Type
118, Investigation of nonnative fish escapement from Elkhead Reservoir.
Copyright Material
NO
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frame (0.91m x 0.91m) and an inner and outer net similar to a fyke net in design. The nets had <br />6.3 mm mesh with a 3 m long bag. During 2003, one net was used on the outlet structure and <br />one net was used on the east side of the spillway. These nets were used again in 2004, but an <br />additional net was also used on the west side of the spillway. Escapement was calculated by the <br />following equation: <br />Escapement (Fish per hour) _ ((spillway width/net width) x (number of fish per hour per net)) <br />2003: Total fish per hour = 45 x (Fish per hour) <br />2004: Total fish per hour = 22.5 x (Fish per hour) <br />Sampling was conducted during four weeks during April through early June each year. <br />Sampling during 2003 was conducted during the weeks of Apri128, May 5, May 19 and June 2 <br />(Table 1). During 2004 sampling was conducted during the weeks of May 3, May 18, May 25 <br />and June 1. One net was always set to capture the entire release from the outlet (Figure 5). A <br />second net was used on the top of the spillway adjacent to the east retaining wall (Figure 6 and <br />Figure 7). A third net was set on the spillway adjacent to the west retaining wall during <br />sampling conducted in 2004 (Figure 8). Each net was anchored with a metal frame and ropes to <br />the spillway chute retaining wall. The nets were left in place during sample sessions and <br />checked for fish every two hours. The nets were set during three or four days of each monitoring <br />week. All fish captured were identified, weighed and measured. All live fish were marked (fin <br />clip for small fish and individual floy tag for large fish) and returned to the reservoir. Live fish <br />were released on the east side of the reservoir approximately 100 meters from the dam. <br />Discharge during sampling was obtained from USGS Gage 9246400. <br />Table 1. Sampling dates for the Elkhead Reservoir escapement study, 2003 and 2004. <br />Week Da s sam led <br />A ri128, 2003 A ri129, A ri130, Ma 1 <br />Ma 5, 2003 Ma 6, Ma 7, Ma 8 <br />Ma 19, 2003 Ma 19, May 20, Ma 21, May 22 <br />June 2, 2003 June 2, June 3, June 4, June 5 <br />Ma 3, 2004 Ma 3, Ma 4, Ma 5 <br />Ma 18, 2004 Ma 18, Ma 19, Ma 20 <br />Ma 25, 2004 Ma 25, Ma 26, Ma 27, <br />June 1, 2004 June 1, June 2, June 3 <br />FINAL REPORT -Elkhead Reservoir Escapement, Project No.: 118 Page 5 <br />Miller Ecological Consultants, Inc. May 20, 2005 <br />
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