Genetic variability of rainbow trout (Oncorhynchus mykiss) cultured in Iran using molecular RAPD markers

In the present study we evaluated the amount and distribution of genetic variation by using RAPD marker variation of ۱۲ markers loci in three broodstock groups of rainbow trout. A total of ۴۷ polymorphic bands were observed in Iranian strain, average number of bands was ۱۰ and average number of polymorphic bands per primer was ۳.۹۲. The total detected bands in rainbow trout strain originated from French, was ۱۲۰ bands with an average number of ۱۰ bands per RAPD primer. A total of ۱۱۷ amplified were detected in Norwegian population, with an average number of bands and average number of polymorphic bands per primer was ۹.۷۵ and ۲.۵۸, respectively. Data for observed and effective number of alleles, Nei’s genetic diversity and Shannon’s information index for all the three populations were ۱.۳۱, ۱.۲۰, ۰.۱۲۰ and ۰.۱۷۰, respectively. The mean coefficient of gene differentiation value and the estimate of gene flow across the populations were found as ۰.۲۹۹ and ۰.۱۷۱, respectively. The Nei measures of genetic distance and identity between pairs of rainbow trout strains indicate that the strain originated from France and Iran has the highest genetic identity, while the fish originated from Norway and France showed the greatest genetic distance.