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Hagelin, Anna; Museth, Jon; Greenberg, Larry; Kraabol, Morten; Calles, Olle; Bergman, Eva
Canadian journal of fisheries and aquatic sciences, 02/2021, Letnik: 78, Številka: 2Journal Article
Passage of hydropower plants by upstream-migrating salmonid spawners is associated with reduced migration success, and the need for knowledge of fish behavior downstream of dams is widely recognized. In this study, we examined fishway passage of landlocked Atlantic salmon (Salmo salar) in River Klaralven, Sweden, and brown trout (Salmo trutta) in River Gudbrandslagen, Norway, and the influence of prior experience on passage success in 2012 and 2013. Fishway trap efficiency varied from 18% to 88% and was influenced by river discharge. Most salmon (81%) entered the fishway trap on days without spill, and salmon moved from the turbine area to the spill zone when there was spill, with small individuals showing a stronger reaction than large fish. Analysis of fish with and without prior trap experience showed that a higher percentage of the "naive" fish (70% of salmon and 43% of the trout) entered the fishway traps than the "experienced" ones (25% of the salmon and 15% of the trout). Delays for fish that entered the trap ranged from 3 to 70 days for salmon and 2 to 47 days for trout.
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Vnos na polico
Trajna povezava
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