Abstract
Adult sea trout individuals caught during their spawning migration in the Nemunas, Jūra, Vilnia and Žeimena rivers were analysed. The level of genetic variation was assessed in the samples by means of the mitochondrial DNA ND1 segment RFLP analysis. Five composite haplotypes were observed in the sea trout populations of the Nemunas basin with significant levels of interpopulation diversity allowing determination of separate management units. The genetic structure of the Vilnia sea trout population preliminary demonstrated the influence of the artificial stocking of farmed sea trout into this river. The total genetic variation in the sea trout populations from the Nemunas basin was compared to the existing data from other populations within the Baltic Sea drainage. According to the results of mtDNA analysis, populations of sea trout in Lithuanian rivers might be derived from eastern glacial refugia.
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