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Size dependent survival of juvenile atlantic salmon salmo salar and brown trout salmo trutta from the cold river beiarelva northern norway



Size dependent survival of juvenile atlantic salmon salmo salar and brown trout salmo trutta from the cold river beiarelva northern norway



Fauna Norvegica Series A 5(5): 42-45



The growth of Atlantic salmon S. salar L. and brown trout S. trutta L. in the very cold river Beiarelva is so low that not all individuals reach the critical lengths during their 1st summer to form scales. After their 1st winter, each year-class of Atlantic salmon and brown trout can be divided into 2 length groups, with the smaller fish lacking the 1st annulus, and the larger fish having this annulua. For this reason length-dependent survival for the rest of their freshwater life could be examined. In brown trout the same survival was found in small and larger parr of all year-classes investigated. In Atlantic salmon the same was found in all year-classes except 1. In 1 year-class the survival was significantly less in the smaller group than in the larger. In 2 + and older fish of both Atlantic salmon and brown trout some of the small individuals had grown as long as most of the individuals having the 1st annulus, whereas others were still the smallest ones in the year-class. The smallest yearlings are not always the smallest fish in later years. The very good food conditions for the parr in river Beiarelva may explain the good survival of small individuals.

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Accession: 006424549

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