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Fallback, Reascension And Adjusted Fishway Escapement Estimates For Adult Chinook Salmon And Steelhead At Columbia And Snake River Dams, 1996-2003 Item Info
- Title:
- Fallback, Reascension And Adjusted Fishway Escapement Estimates For Adult Chinook Salmon And Steelhead At Columbia And Snake River Dams, 1996-2003
- Report Type:
- Technical Report
- Date:
- 2005
- Authors:
- Boggs, C.T.; Keefer, M.L.; Peery, C.A.; Stuehrenberg, L.C.; Burke, B.J.
- Affiliations:
- Fish and Wildlife Sciences, University of Idaho; Northwest Fisheries Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration
- Report Number:
- 2005-6
- Publisher:
- University of Idaho
- Funder:
- U.S. Army Corps of Engineers, Portland District; U.S. Army Corps of Engineers, Walla Walla District
- Abstract:
- During their upstream spawning migration in the Columbia River basin, some adult salmon and steelhead Oncorhynchus spp. ascend and then fall back over mainstem hydroelectric dams. Fallback can result in fish injury or death, migration delays and biased fishway counts, the primary index for escapement and the basis for production estimates and harvest quotas. We used radio-telemetry to calculate fallback percentages and rates, reascension rates, biases in fishway escapement estimates due to fallback, and occurrence of behaviorally motivated fallback by fish that passed dams upstream from natal spawning sites. We also evaluated fallback by adult fish tha had been PIT tagged as juveniles (known source). The study area included the four Lower Columbia and the four Lower Snake River dams from 1996 to 2003. Research fish were adult spring–summer and fall Chinook salmon O. tshawytscha and steelhead O. mykiss collected at Bonneville Dam, the first dam Columbia River stocks encounter after leaving the ocean.
- Species:
- Steelhead, Oncorhynchus mykiss Chinook salmon, Oncorhynchus tshawytscha sockeye salmon, Oncorhynchus nerka
- Location:
- Bonneville Dam; Columbia River; Snake River; Lower Granite Dam; The Dalles Dam; John Day Dam; McNary Dam; Ice Harbor Dam; Lower Monumental Dam; Little Goose Dam
- Subjects:
- salmonids Federal Columbia River Power System FCPRS radiotelemetry migration passage behavior fishways fallback rates PIT tags passive integrated transponders
- Source:
- University of Idaho, Fish Ecology Research Lab
- Original Filename:
- 2005-06-CK-SH-fallback-rates-adjusted-escapement-1996-2003.pdf
- Format:
- application/pdf
Source
- Preferred Citation:
- "Fallback, Reascension And Adjusted Fishway Escapement Estimates For Adult Chinook Salmon And Steelhead At Columbia And Snake River Dams, 1996-2003", Adult Salmon and Steelhead Migration Studies: 1996-2014, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/ferl/items/ferl-tr-2005-6.html
Rights
- Rights:
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