2002 annual report: Upper Redwood Creek juvenile salmonid downstream migration study, 2000-2002 seasons
Sparkman MD. 2003. 2002 annual report: Upper Redwood Creek juvenile salmonid downstream migration study, 2000-2002 seasons. Project 2a5. California Department of Fish and Game. Northern California
Taken from abstract: "Juvenile anadromous salmonid trapping was conducted in upper Redwood Creek from March 28 - August 4, 2002, to estimate population size of downstream migrating juvenile 0+ chinook salmon, 1+ steelhead trout, and 2+ steelhead trout using stratified mark/recapture methods. The trap operated 127 nights out of 129 nights possible, and captured 223,167 0+ chinook salmon, 1+ steelhead and 2+ steelhead and 9 cutthroat trout. No juvenile coho salmon were captured. 0+ chinook salmon, 1+ steelhead trout, and 2+ steelhead trout catches were positively related to the relative gage height of the stream at the trapping site. 0+ steelhead trout catches were negatively related to the gage height. Trap efficiencies for 0+ chinook salmon, 1+ steelhead trout, and 2+ steelhead trout by week averaged 50.6, 42.3, and 20.4%, respectively. 0+ chinook salmon trap efficiencies were negatively related to stream gage height, and 1+ steelhead trap efficiencies showed positive relations. 2+ steelhead trap efficiencies are positive related to gage height and night releases of marked fish. Total population estimates with 95% confidence intervals for 0+ chinook salmon, 1+ steelhead, and 2+ steelhead trout were 518,189 (494,834 - 541,543), 28,501 (26,701 - 30,300), and 7,370 (6,286 - 8,455), respectively. Peak population out-migration for 0+ chinook salmon, 1+ steelhead trout, and 2+ steelhead trout occurred during April-June, May-June, and April-May, respectively, and followed trends of actual catches. 0+ chinook salmon average fork length and weight, and 0+ steelhead trout average fork length significantly increased over the course of the study. No significant relationships of fork length and weight with time were found for 1+ steelhead. 2+ steelhead average fork lengths decreased over time, and average weight showed no significant relationship. Comparisons are made with downstream migration data collected in 2001 and 2000."
- Type
- Published Report
- Authors
- Sparkman, Michael
- Date of Issue
- 2003-01
- Publisher
- California Department of Fish and Game
- Units
- REDW
- Keywords
- Chinook Salmon, Fish Studies, mark/recapture, Migration, Oncorhynchus mykiss, Oncorhynchus tshawytscha, Population, Redwood Creek, Salmonid Species, Steelhead Trout, Trapping