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Resource use of native and stocked brown trout Salmo trutta L., in a subarctic lake

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Abstract:

Habitat use, food composition and growth of stocked and native brown trout, Salmo trutta L., were studied in the subarctic Lake Muddusj√§rvi in northern Finland. Stocked brown trout and native brown trout preferred littoral and pelagic areas. Trout were stocked in October. In June stocked trout fed primarily on invertebrates while native fish were piscivorous. From July onwards the composition of the diet of both stocked and native trout was similar and consisted almost entirely of small-sized whitefish. Brown trout were already piscivorous at a length of about 20 cm. The mean length of prey consumed was about 12 cm. Mean length-at-age was similar from the second year in the lake despite of the larger size of stocked fish during the first year in the lake.

Keywords: brown trout; feeding; growth; habitat use; stocking

Document Type: Research Article

Affiliations: Department of Limnology and Environmental Protection, University of Helsinki, Finland

Publication date: February 1, 2001

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