Movement and mortality of stocked brown trout in a stream |
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Authors: | K. Aarestrup&dagger ,N. Jepsen&dagger ,A. Koed&dagger , S. Pedersen&dagger |
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Affiliation: | Danish Institute for Fisheries Research, Department of Inland Fisheries, Vejlsøvej 39, DK‐8600 Silkeborg, Denmark |
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Abstract: | The movement and mortality of stocked brown trout Salmo trutta were investigated using radio telemetry. Four brown trout left the study area whereas the remaining fish were stationary. After 5 weeks, 13 out of 50 tagged brown trout were still alive in the stream. Surviving fish had a significantly lower mean movement per day than fish, which later either died or disappeared. This difference in behaviour was most pronounced 2 to 8 days after release. Predation by the otter Lutra lutra was probably the main cause of the observed mortality. |
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Keywords: | mortality predation Salmo trutta stocking telemetry |
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