Food composition, habitat use and growth of stocked and native Arctic charr, Salvelinus alpinus, in Lake Muddusjärvi, Finland
Identifieur interne : 000979 ( Istex/Curation ); précédent : 000978; suivant : 000980Food composition, habitat use and growth of stocked and native Arctic charr, Salvelinus alpinus, in Lake Muddusjärvi, Finland
Auteurs : K. Kahilainen [Finlande] ; H. Lehtonen [Finlande]Source :
- Fisheries Management and Ecology [ 0969-997X ] ; 2002-08.
English descriptors
Abstract
Habitat use, growth and food composition of native and stocked Arctic charr, Salvelinus alpinus (L.), were studied in the subarctic Lake Muddusjärvi, northern Finland, to investigate reasons for poor stocking success. Samples were collected with pelagic and epibenthic gill nets. Stocked and native charr occurred in similar epibethic habitats, whereas pelagic habitat was avoided. Native charr grew fast after shifting to piscivory. Growth rate of stocked charr was slow because only a small proportion of stocked fish became piscivorous during the first year after stocking. During the first lake year, stocked charr divided into slow‐growing planktivores and fast‐growing piscivores. Piscivorous stocked and native charr consumed only whitefish, Coregonus lavaretus (L.), as their prey. Small‐sized (<10 cm) whitefish were preferred when shifting to piscivory.
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DOI: 10.1046/j.1365-2400.2002.00302.x
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ISTEX:0CACCC4AC8C8D9472D553BE8872E33FCC433F291Le document en format XML
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<front><div type="abstract" xml:lang="en">Habitat use, growth and food composition of native and stocked Arctic charr, Salvelinus alpinus (L.), were studied in the subarctic Lake Muddusjärvi, northern Finland, to investigate reasons for poor stocking success. Samples were collected with pelagic and epibenthic gill nets. Stocked and native charr occurred in similar epibethic habitats, whereas pelagic habitat was avoided. Native charr grew fast after shifting to piscivory. Growth rate of stocked charr was slow because only a small proportion of stocked fish became piscivorous during the first year after stocking. During the first lake year, stocked charr divided into slow‐growing planktivores and fast‐growing piscivores. Piscivorous stocked and native charr consumed only whitefish, Coregonus lavaretus (L.), as their prey. Small‐sized (<10 cm) whitefish were preferred when shifting to piscivory.</div>
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