Monitoring of distribution of monogenean ectoparasite Gyrodactylus salaris, dangerous for wild populations of the Atlantic salmon in northwest Europe, is carried out by Veterinary Services and the profile scientific organizations in different European countries. In Murmansk area, Gyrodactylus lavareti was first found in a trout farm in Tuloma River in 1996. From now on, representatives of genus Gyrodactylus are annually identified in farmed fish in Tuloma River, according to ichthyopatholocic observations of salmonid farms in Murmansk area. Species G. salaris was indicated in 2016 in farmed trout in Tuloma River and in wild salmon smolts in Pak River of the Nizhnetulomsky water basin. Throughout a number of years, the experts of Regional Veterinary Service and the scientific organizations of Murmansk area discuss necessity of working out of measures to prevent Gyrodactylus salaris introduction in the rivers of the Kola Peninsula with wild populations of the Atlantic salmon. Any transport of smolt and live fish from the freshwater objects of Baltic Sea basin to the water objects of the Barents Sea basin sea would become the most significant threat by parasite Gyrodactylus salaris distribution and might cause a damage of natural populations of the Atlantic salmon of Kola Peninsula.

There is information obtained on species composition, parasitofauna, and structural characteristics of periwinkles in autumn period in three areas (Abram-Mys settlement, Mishukovo settlement, Retinskaya bay) of western Murman coast, and was made a comparison of data with periwinkles of Eastern Murman. The eastern Murman coast is characterized by 6 species of periwinkles, with 5 species noted on the western Murman coast in this study, because the molluscs Littorina compressa have not been found. The infection rate of males L. saxatilis and L. obtusata in senior size classes of East Murman exceeds the infection rate of females what leads to the difference in the sex structure ratio of molluscs. This fact is also characteristic for periwinkles of Western Murman. Periwinkles of Eastern Murman significantly exceed periwinkles of Western Murman in shell height, shell width, and densities. The difference in maximum age is a one year for L. saxatilis molluscs of Western and Eastern Murman; there is no difference for L. obtusata. Maximum age for L. littorea is 13+, for Eastern Murman is 28+. The dominance of trematodes with a life cycle without a free-standing larval stage and a second intermediate host is typical for periwinkles of Western and Eastern Murman.

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