Abstract

The results of a series of experimental stocking programmes designed to assess the effects of fin-clipping, fin-damage and floy tags on the survival and growth of brown trout (Salmo trutta L.) are presented. Data indicate that even a single fin clip can seriously reduce survival and also retard the growth of fish. Trout released with extensive fin-damage also exhibited poorer survival and growth patterns than their unmarked counterparts. The growth and survival of trout (≥ 18 cm) does not appear to have been altered by floy-tagging.

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