Are growth and recapture of hatchery-reared and resident brown trout (Salmo truttaL.) density dependent after stocking?.

Baer, J. and Brinker, A. (2008) Are growth and recapture of hatchery-reared and resident brown trout (Salmo truttaL.) density dependent after stocking?. Ecology of Freshwater Fish, 17 (3). pp. 455-464. DOI 10.1111/j.1600-0633.2008.00297.x.

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Abstract

The population density of brown trout (Salmo tnttta) in a
small natural system was manipulated in six equal-length stream sections
by stocking hatchery-reared 1 + brown traut (unstocked, tripled and
quintupled) over two consecutive years. The results showed that
hatchery~reared trout grew more slowly and were more mobile than
resident trout, and that their growth was inversely density dependent. In
contrast, growth of the resident traut was density independent. The
· recapture of 1 + resident and hatchery-reared traut was inve_rsely density
dependent. This is most lilcely a consequence of increased competition.
However, after a single winter the population density retumed to its
base Ievel prior stocking and older resident traut showed no densitydependent
recapture. Thus, the advantage of stocking, here higher
biomass, may have the detrirnental effect of decreasing resident stocks
of the same size class during summer.

Document Type: Article
Keywords: density-dependent; growth; recapture; brown traut
Refereed: Yes
Open Access Journal?: No
Publisher: Wiley
Projects: Enrichment
Date Deposited: 30 Aug 2016 12:17
Last Modified: 30 Aug 2016 12:17
URI: https://oceanrep.geomar.de/id/eprint/33450

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