Chromosome polymorphism in wild Atlantic salmon, Salmo salar L., from Asturias, northern Spain

Abstract. Nine samples of Atlantic salmon, Salmo salar L., from four different rivers in Asturias (northern Spain) and three different life stages (fry, parr, adult) were karyotyped. The distributions of 2n chromosome numbers in the samples were not statistically different, suggesting the Asturian Salmo salar populations have the same chromosomal polymorphism make-up. They were, however, significantly different from populations in Scotland and Norway used to stock many Asturian rivers.