Actions for Design and Analysis of Salmonid Tagging Studies in the Columbia Basin, Volume XIII; Appraisal of System-Wide Survival Estimation of Snake River Yearling Chinook Salmon Released in 1997 and 1988, Using PIT-Tags Recovered from Caspian Tern and Double-Crested Cormorant Breeding Colonies on Rice Island, 1997-1998 Technical Report [electronic resource].

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Design and Analysis of Salmonid Tagging Studies in the Columbia Basin, Volume XIII; Appraisal of System-Wide Survival Estimation of Snake River Yearling Chinook Salmon Released in 1997 and 1988, Using PIT-Tags Recovered from Caspian Tern and Double-Crested Cormorant Breeding Colonies on Rice Island, 1997-1998 Technical Report [electronic resource].

Published
Portland, Ore : United States. Bonneville Power Administration, 2000.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
64 pages : digital, PDF file
Additional Creators
University of Washington, United States. Bonneville Power Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
PIT-tags recovered from tern and cormorant breeding colonies at Rice Island and observations from the interrogation systems at John Day and Bonneville Dams were incorporated into survival analyses. Whether the estimates for the upper reaches of the system, between Lower Granite and McNary Dams were as expected (with weighted averages S{sub LGR-LGS} = 0.996, S{sub LGS-LMN} = 0.837, and S{sub LMN-McN} = 0.941), those for the lower reaches, between John Day and Bonneville Dams, appeared positively biased with survival estimates typically greater than 1. Their weighted averages were S{sub McN-JDA} = 0.707 and S{sub JDA-BON} = 1.792 for 1997 releases. For the 1998 releases, they were S{sub McN-JDA} = 0.795 and S{sub JDA-BON} = 1.312. If the estimates for the lower reaches were biased, the estimates for the whole project would also be biased (S{sub LGR-BON} = 0.819). We determined that bias could have arisen if the terns and cormorants of Rice Island fished for salmon yearlings in waters of the BON-Rice reach at low rates (M{sub BON-Rice} ≤ 0.2), and the rates of tag-deposition and tag-detection were low (R{sub D} x R{sub R} ≤ 0.4). Moreover, unknown levels of uncensored post-detection mortality and scavenging of previously dead salmon yearlings may have also added to the bias.
Report Numbers
E 1.99:doe/bp-02341-10
doe/bp-02341-10
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/01/2000.
"doe/bp-02341-10"
"Contract 1990BI023410"
Skalski, John R.; Perez-Comas, Jose A.
Type of Report and Period Covered Note
Topical; 01/01/2000 - 12/31/2000
Funding Information
1990BP02341
198910700
View MARC record | catkey: 14138320