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Benefits of repeated stocking with adult, hatchery-reared brown trout, Salmo trutta, to recreational fisheries?
J. BAER, K. BLASEL & M. DIEKMANN
Fisheries Research Station Baden-Württemberg, Langenargen, Lake Constance, Germany
Correspondence to Jan Baer, Fisheries Research Station of Baden-Württemberg, Untere Seestrasse 81, 88085 Langenargen, Lake Constance, Germany (e-mail: jan.baer@lvvg.bwl.de)
Copyright 2007 The Authors. Journal compilation 2007 Blackwell Publishing Ltd
KEYWORDS
angling • brown trout • catch per unit effort • movement • recapture rates • stocking

ABSTRACT

Abstract Recaptures of adult, hatchery-reared, brown trout, Salmo trutta L., and fishing time from anglers were used to evaluate the benefits of stocking programmes with repeated releases of adult brown trout. The recapture rate varied between 17% and 29%. The time between stocking and capture (referred to as residence time) varied between 1 and 160 days (median 3–49 days). Between 67% and 84% of trout caught in the river were recently released fish. Fishing effort increased after stocking, thereby increasing the impact of angling on wild stocks. Stocking with adult brown trout decreases the impact of angling on wild trout only if the time spent fishing by all anglers is kept stable. Furthermore, because of the short residence time of stocked trout, long-term impacts through competition for space and food, or genetic impact through introgression, are limited.


DIGITAL OBJECT IDENTIFIER (DOI)
10.1111/j.1365-2400.2006.00523.x About DOI

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