Data from: Migratory passage structures at hydropower plants as potential physiological and behavioural selective agents ...

• Main Authors: Haraldstad, Tormod, Haugen, Thrond Oddvar, Kroglund, Frode, Olsen, Esben Moland, Höglund, Erik
• Format: Dataset
• Language: English
• Published: Dryad 2019
• Subjects: hydropower; 2010; Alantic salmon; Salmo salar; Atlantic salmon
• Online Access: https://dx.doi.org/10.5061/dryad.8b876q6; https://datadryad.org/stash/dataset/doi:10.5061/dryad.8b876q6

Anthropogenic activities affect fish populations worldwide. River dams have profound impacts on ecosystems by changing habitats and hindering migration. In an effort to counteract such effects a diversity of mitigation measures has been installed at hydroelectric power plants. Still, not all individuals in a population use these measures, creating potentially strong selection processes at hydroelectric power plants. Especially, during migration, when fish can get heavily delayed or pass through a hydropower turbine, facing increased mortality compared to those using a safe bypass route. In this study, we quantify migration route choices of descending wild PIT-tagged Atlantic salmon smolts released upstream from a hydroelectric plant. We demonstrate how only a few meters’ displacement of bypass canals can have a large impact on the fish guidance efficiency. The proportion of fish using the bypasses increased when water was released in surface gates closer to the turbine intake. During a period of low fish ... : R scriptumerk.rstCatches of Atlantic salmon in River RST-trapsall.pit.dataMark recapture data. PIT-tagged Atlantic salmon smoltsFGEdistFish guidance efficiency vs. distance to turbinetime2event.dataData for time-to-event analysis ...