Аннотация:Morphobiological and genetic features of a previously unknown population of Parasalmo mykiss from the Voyamopolka River in western Kamchatka (Russia) were studied. This population was compared to other populations from the rivers of western and eastern coasts of Kamchatka and North America. It was shown that the population from the Voyamopolka River was represented by individuals that migrated to the estuary for feeding after 3-4 years of living in the river. These individuals have their own gene pool and differ from P. mykiss from other rivers by a series of parameters. As opposed to the American forms, P. mykiss from the Voyamopolka River and other Kamchatka populations were found to be very close to the so called "coastal" form of the fish.