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Does embeddedness affect growth performance in juvenile salmonids? An experimental study in brown trout, Salmo trutta L.
Author(s) -
Bolliet V.,
Bardonnet A.,
Jarry M.,
Vignes J. C.,
Gaudin P.
Publication year - 2005
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.1600-0633.2005.00100.x
Subject(s) - brown trout , salmo , juvenile , fishery , fish <actinopterygii> , biology , trout , juvenile fish , ecology
– The effect of an embedded substratum on emigration and growth in juvenile brown trout was investigated in an artificial stream with sand added to produce sections of embedded or nonembedded substratum. Fish were allowed to leave the sections and were caught daily in a downstream trap. After catching and counting, fish were put back in their original section in order to keep the same amount of fish. Captures were high only on the first days after fish release. During the first 6 days after fish release, downstream‐moving fish were more numerous in the embedded than in the nonembedded sections. The embedded substratum significantly decreased the final mean body weight and condition factor and increased heterogeneity in fish size. We suggest that a decrease in the habitat carrying capacity for juveniles could be the main factor explaining this result.