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Effect of density on competition between wild and hatchery‐reared Atlantic salmon for shelter in winter

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Abstract:

The effect of varying the density of hatchery‐reared Atlantic salmon Salmo salar on the ability of single wild fish to occupy a shelter is assessed. Although there was strong density‐dependence on sheltering overall, the ability of wild Atlantic salmon parr to occupy a shelter was not affected by the presence of hatchery‐reared fish even when outnumbered by four to one. These findings illustrate a competitive asymmetry for shelter in favour of the wild fish at the densities tested.

Keywords: Salmo salar; competition; density; rearing conditions; sheltering behaviour; winter

Document Type: Regular Paper

DOI: https://doi.org/10.1111/j.0022-1112.2004.00530.x

Affiliations: 1: Cardiff School of Biosciences, Cardiff University Main Building, P. O. Box 915, Cardiff, Wales, CF10 3TL, U.K. and 2: Fisheries Research Services, Freshwater Laboratory, Faskally, Pitlochry, Perthshire, Scotland, PH16 5LB, U.K.

Publication date: 2004-12-01

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