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Movement and mortality of stocked brown trout in a stream
Author(s) -
Aarestrup K.,
Jepsen N.,
Koed A.,
Pedersen S.
Publication year - 2005
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.0022-1112.2005.00634.x
Subject(s) - brown trout , salmo , biology , lutra , otter , fishery , trout , fish <actinopterygii> , predation , salmonidae , stocking , ecology
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.