Fig. 1

Map showing the location of the rivers of the five Norwegian wild salmon populations included in this study: Figgjo, Arna, Vosso, Driva and Skibotn. The Matre research station is also marked where the fish were reared throughout the experimental period. Parental Atlantic salmon of the Figgjo, Arna and Vosso strain were collected from their respective rivers, while parental salmon of the Driva and Skibotn strains were reared in the gene bank at Haukvik, central Norway