Genetic diversity within sea trout population from an intensively stocked southern Baltic river, based on microsatellite DNA analysis

Abstract

Sea trout, S almo trutta L ., populations in the Slupia River basin have been affected by mass stocking with smolts and fry. This work is focused on a small‐scale differentiation in sea trout populations from one basin with a strong emphasis on the relationship between wild and hatchery origin fish. A total of 216 sea trout were genotyped at 10 microsatellite loci. Global F ST obtained by amova was low at 0.0165. Pairwise F ST were significant for all tests except wild and stocked adults. The highest pairwise difference was found between the hatchery sample and Kwacza ( F ST = 0.038). Analysis of the genetic structure revealed micro‐geographical differentiation with four subpopulations. The quality of the artificial spawning was found not to be adequate with a high risk of adverse effects to the whole population. All future stocking actions in the basin should consider the existing population structures.

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