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Item title: Evaluation Of Fallback Of Adult Salmon And Steelhead Via Juvenile Bypass Systems At Bonneville, John Day, McNary And Ice Harbor Dams: 2000-2001
Report type: Technical Report
Date: 2004
Authors: Jepson, M.A.; Bjornn, T.C.; Peery, C.A.; Keefer, M.L.; Tolotti, K.R.; Moser, M.L.
Affiliations: Idaho Cooperative Fish and Wildlife Research Unit; Northwest Fisheries Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration
Report number: 2004-3
Publisher: University of Idaho
Funder: U.S. Army Corps of Engineers, Portland District; U.S. Army Corps of Engineers, Walla Walla District
Abstract: We used radiotelemetry techniques to assess the fallback behavior of adult spring, summer, and fall Chinook salmon and steelhead via juvenile bypass systems (JBS) at Bonneville, John Day, McNary, and Ice Harbor dams in 2000 and 2001. Of the 868 fallback events recorded at the four dams during the two study years, 77 (8.9%) were via a JBS; 22 by spring-summer Chinook salmon, four by fall Chinook salmon, and 51 by steelhead. Sixty-one percent of all JBS fallback events occurred in 2001. Fifty-six percent of them occurred at McNary Dam. The median JBS residency time was 10.4 h based on minimum estimates and 60.2 h based on maximum estimates.
Species: Steelhead, Oncorhynchus mykiss; Chinook salmon, Oncorhynchus tshawytscha
Concepts: salmonids; Federal Columbia River Power System; FCPRS; radiotelemetry; migration; passage behavior; fishways; fallback rates; juvenile bypass systems; JBS
Location: Bonneville Dam; John Day Dam; McNary Dam; Ice Harbor Dam; Columbia River; Snake River
Source: University of Idaho, Fish Ecology Research Lab
Type: Text
Format: application/pdf
Rights: These files are provided for research purposes with copyright held by the original authors. Please contact the publishing organization for more information about rights.
Digital identifier: ferl-tr-2004-3
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