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Utilisation of fluvial and lacustrine habitat by anadromous Atlantic salmon, Salmo sa
By S.M. Einarsson, D.H. Mills, V. Johannsson
Fisheries Research, Volume 10, Issues 1-2 Fisheries Research and the Atlantic Salmon - Assessment and Regulation in a Time of Change, December 1990, Pages 53-71, ISSN 0165-7836, DOI: 10.1016/0165-7836(90)90015-N.
Estimates were obtained of densities, standing crops and populations of juvenile salmon in the fluvial and lacustrine habitats of the Laxa i Kjos river system. Very high densities of fry (1177-1313) per 100 m2) and parr (66-108 per 100 m2) recorded below a lake outfall were attributed to a high production (1.65 kg wet weight m-1 year-1) of Simulium larvae. Elsewhere, values were lower and in certain instances were attributable to low stream temperatures (maximum summer temperature 10[degree sign]C) and unstable substrate.
Minimum values for lake smolt production ranged from 0.005 to 0.035 g m-2 year-1. In one year, a proportion of the smolt population remained in the lake beyond the normal migration season (late May-late June) and grew to a large size (up to 25.0 cm). The use of the lake environment as both a spawning and nursery area is discussed.