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Escapement, Harvest, And Unaccounted-For Loss Of Radio-Tagged Adult Chinook Salmon And Steelhead In The Columbia-Snake River Hydrosystem, 1996-2002 Item Info
- Title:
- Escapement, Harvest, And Unaccounted-For Loss Of Radio-Tagged Adult Chinook Salmon And Steelhead In The Columbia-Snake River Hydrosystem, 1996-2002
- Report Type:
- Technical Report
- Date:
- 2005
- Authors:
- Keefer, M.L.; Peery, C.A.; Daigle, W.R.; Jepson, M.A.; Lee, S.R.; Boggs, C.T.; Tolotti, K.R.; Bjornn, T.C.; Burke, B.J.; Moser, M.L.; Stuehrenberg, L.C.
- Affiliations:
- Fish and Wildlife Sciences, University of Idaho; National Marine Fisheries Service, National Oceanic and Atmospheric Administration
- Report Number:
- 2005-02
- Publisher:
- University of Idaho
- Funder:
- U.S. Army Corps of Engineers, Portland District; U.S. Army Corps of Engineers, Walla Walla District; Bonneville Power Administration
- Abstract:
- Accurate estimates of escapement by adult anadromous salmonids are difficult, especially in large, multi-stock river systems. We used radiotelemetry, a fishery reward program, and help from cooperating agencies and hatcheries to calculate escapement, harvest, and unaccounted-for loss rates for 10,498 adult Chinook salmon (Oncorhynchus tshawytscha) and 5,324 steelhead (O. mykiss) during six migration years in the Columbia River basin. Mean annual escapements E27to spawning sites, hatcheries, or the upper bounds of the monitored hydrosystem (top of Lower Granite or Priest Rapids dams) were 73.4% (spring–summer Chinook salmon), 61.3% (fall Chinook salmon) and 62.6% (steelhead). Mean reported harvest rates were 8.7% (spring–summer Chinook), 22.0% (fall Chinook) and 15.1% (steelhead) within the mainstem hydrosystem, and 5.9, 3.4 and 5.7%, respectively, in lower hydrosystem tributaries. Harvest-adjusted escapement means for the monitored hydrosystem were 87.5% (spring–summer Chinook), 86.7% (fall Chinook), and 83.4% (steelhead). On average, 12 to 17% of each run had unknown fates within the mainstem hydrosystem.
- Species:
- Steelhead, Oncorhynchus mykiss Chinook salmon, Oncorhynchus tshawytscha
- 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 escapement estimates harvest rates loss rates
- Source:
- University of Idaho, Fish Ecology Research Lab
- Original Filename:
- 2005-02-CK-SH-escapement-harvest-loss-1996-2002.pdf
- Format:
- application/pdf
Source
- Preferred Citation:
- "Escapement, Harvest, And Unaccounted-For Loss Of Radio-Tagged Adult Chinook Salmon And Steelhead In The Columbia-Snake River Hydrosystem, 1996-2002", Adult Salmon and Steelhead Migration Studies: 1996-2014, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/ferl/items/ferl-tr-2005-02.html
Rights
- Rights:
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