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Density‐dependent growth in hatchery‐reared brown trout released into a natural stream

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Hatchery‐reared brown trout Salmo trutta stocked in a natural stream in addition to resident wild brown trout grew more slowly than those stocked with an experimentally reduced density of brown wild trout. In both cases, hatchery‐reared brown trout grew more slowly than resident wild fish in control sections. Mortality and movements did not differ among the three categories of fish. The results showed that growth of stocked hatchery‐reared brown trout parr was density‐dependent, most likely as a consequence of increased competition. Thus, supplementary release of hatchery‐reared fish did not necessarily increase biomass.
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Keywords: density‐dependence; enhancement; growth; hatchery; movement; stocking

Document Type: Regular Paper

Affiliations: Animal Ecology, Department of Zoology, Göteborg University, Box 463, SE-405 30 Göteborg, Sweden

Publication date: 01 November 2004

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