Escaped farm salmon migrate to the rivers to spawn, potentially affecting wild salmon negatively, both genetically and ecologically.
Photo © Øyvind Solem/NINA
Using scale sample analysis, NINA has quantified the proportion of escaped farm salmon in catches from sports fishing, coastal fisheries and samples collected in the autumn, shortly before the spawning period. These results are used to predict the effects of farm salmon introgression to wild populations of Norwegian Atlantic salmon.
NINA also performs genetic analyses to explore whether the introgression of escaped farm salmon to wild salmon populations has led to changes in the genetic composition of wild salmon.