ICES Journal of Marine Science 54: 9866997. 1997 Genetic structure of wild and reared Atlantic (Salmo salar L.) populations in Iceland

• Main Authors: A. K. Danielsdottir, G. Marteinsdottir, F. Arnason, S. Gudjonsson
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Atlantic salmon; Iceland; Salmo salar
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.531.3049; http://icesjms.oxfordjournals.org/content/54/6/986.full.pdf

The genetic variation within and between Atlantic salmon (Salmo salar L.) populations in Iceland was studied. A total of 15 19 individuals from 32 rivers and three fish farms were examined. Nineteen isoenzyme systems were analysed, representing 49 loci, of which the number of polymorphic loci varied from two (4.1%) in the river Sunnudalsa to five (10.4%) in the farmed fish (Isno). Mean polymorphism (P) was 6.5%. Seven variable enzyme loci were observed in this study: AAT-4*, GLUDH-2*, GPI-3*, IDDH-2*, IDHP-3*, MDH-3 * and MEP-2*. Average observed heterozygosity (H) varied from 0.022 (s.e.=0.014) to 0.048 (s.e.=0.023) and the mean H was 0.030. Heterogeneity of allele frequencies of sample years and age groups within and between the rivers and drainages in Iceland is presented. Wright’s F,, value was 0.062 and the total gene diversity (Hr) was 0.048. Nei’s genetic distance value (D) between salmon from the 32 rivers varied from 0.000 to 0.006, with a mean value of 0.0017. Genetic distance values between the salmon from the rivers and the farmed salmon varied from 0.000 to 0.008 (mean D=0.0032). The majority of salmon rivers in Iceland contain genetically distinct populations and in larger river systems there may be more than one