Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7263
Title: Effects of power peaking operations on juvenile salmon and steelhead trout migrations—progress 1976
Author/Editor: Carl W. Sims, Wallace W. Bentley, Richard C. Johnsen
Publication Year: 1977
Publisher: National Marine Fisheries Service
Contracting Agency: U.S. Army Corps of Engineers, Portland, Oregon
Contract Number: DACW68-77-C-0025
Date: 1977

Research activities in 1976 continued studies initiated in 1973 to define the effects of dams, power peaking, and flow regulation on juvenile salmon and steelhead trout migrations.  Downstream migrations of juvenile salmon and steelhead trout were sampled in the Salmon, Snake, and Columbia Rivers.  Fish were marked and released at various sites to provide information on survival, timing of migrations, and rates of movement.  Movement patterns of juveniles within and through reservoirs, diel movement at dams, residualism in reservoirs, and predator fish populations were also investigated.  Studies to define the effect of release size of marked fish on rate of recapture and survival and studies of predations in backroll areas of the tailraces of dams were again postponed because of high flows and resulting spill conditions below the dams during the spring migrations.  However, most of our research activities were completed as scheduled and considerable information was obtained.  This report summarizes the results of the research conducted during 1976.