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Radio Telemetry Assessments Of Migration Patterns And Fallbacks Of Adult Salmon And Steelhead In The Forebay Of Bonneville Dam, 1997-1998 Item Info

Title:
Radio Telemetry Assessments Of Migration Patterns And Fallbacks Of Adult Salmon And Steelhead In The Forebay Of Bonneville Dam, 1997-1998
Report Type:
Technical Report
Date:
1999
Authors:
Bjornn, T.C.; Reischel, T.S.; Ringe, R.R.; Tolotii, K.R.; Stuehrenberg, L.C.
Affiliations:
Idaho Cooperative Fish and Wildlife Research Unit; National Marine Fisheries Service, National Oceanic and Atmospheric Administration
Report Number:
99-1
Publisher:
University of Idaho
Funder:
U.S. Army Corps of Engineers, Portland District; Bonneville Power Administration
Abstract:
Migration routes of adult spring and summer Chinook Oncorhynchus tshawytscha and sockeye salmon O. nerka, and steelhead O. mykiss were monitored in the forebay of Bonneville Dam in 1997 to obtain information that could be used to reduce fallback of adults at the dam. Adult spring and summer Chinook salmon were also radio-tracked in 1998 as a continuation of the 1997 study. In 1996, we determined in the adult passage studies that significant numbers of Chinook salmon fell back over Bonneville Dam, and that most of the fallbacks were fish that had passed the dam via the Bradford Island fishway. In 1997, 991 adult spring and summer Chinook salmon, 577 sockeye salmon, and 975 steelhead were trapped at Bonneville Dam, outfitted with radio transmitters, and released downstream from the dam. In 1998, adult spring/summer (957 fish) and fall Chinook salmon (1022 fish) were trapped, tagged and released downstream from Bonneville Dam, but only a sample of the spring/summer Chinook salmon were tracked in the forebay. As the fish with transmitters reascended the dam and exited the Bradford Island fishway into the forebay, they were followed by boat to determine their route through the forebay of powerhouse I and on upstream. We were particularly interested in routes that led to fallbacks at the dam. Because of high flows in 1997, there was an extended period of forced spill that lasted into July. During the April-July period, 122 spring/summer Chinook salmon, 110 sockeye salmon, and 10 steelhead in 1997, and 129 adult spring/summer Chinook in 1998 were tracked in the forebay of Bonneville Dam.
Species:
Steelhead, Oncorhynchus mykiss Chinook salmon, Oncorhynchus tshawytscha sockeye salmon, Oncorhynchus nerka
Location:
Columbia River; Snake River; Bonneville Dam
Subjects:
salmonids Federal Columbia River Power System FCPRS radiotelemetry migration fishways passage behavior fallback rates
Source:
University of Idaho, Fish Ecology Research Lab
Original Filename:
1999-01-Fallback-forebay-Bonneville-1997-1998.pdf
Format:
application/pdf

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Preferred Citation:
"Radio Telemetry Assessments Of Migration Patterns And Fallbacks Of Adult Salmon And Steelhead In The Forebay Of Bonneville Dam, 1997-1998", Adult Salmon and Steelhead Migration Studies: 1996-2014, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/ferl/items/ferl-tr-99-1.html
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