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Migratory behaviour of brown trout, Salmo trutta L: importance of genetic and environmental influences
Author(s) -
Näslund I.
Publication year - 1993
Publication title -
ecology of freshwater fish
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 55
eISSN - 1600-0633
pISSN - 0906-6691
DOI - 10.1111/j.1600-0633.1993.tb00083.x
Subject(s) - brown trout , spawn (biology) , salmo , trout , tributary , population , ecology , fishery , biology , fish migration , geography , habitat , fish <actinopterygii> , demography , cartography , sociology
Lake Storvindeln in northern Sweden supports a population of fast‐growing lake‐run brown trout. Spawning and early rearing take place in the River Vindelälven, while most growth occurs in the lake (piscivory). A smaller tributary to the lake, Låktabäcken Creek, holds a resident, early maturing, short‐lived brown trout population, although no migratory barriers have existed since 1947. To establish a lake‐run trout population, fry from the migratory R. Vindelälven stock were introduced into the creek during 1985–1991. Introduced trout descended to the lake prior to maturing. As a result of the introduction, large adult trout returned from L. Storvindeln to the creek to spawn in 1991 and 1992; i. e., the introduced trout were able to complete a migratory life cycle. Genetic factors appeared to have a primary influence on the predisposition to migrate in this case, and it is suggested that migratory populations rarely develop from strictly resident ones.