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The bullhead (Cottus gobio L.) was for the first time recorded in the Utsjoki River (70° N, 27° E), a large tributary of the Teno River (Northern Finland), in 1979 and in subsequent years spread widely within this lake-river system. The studies of 1993 and 2007 allowed the general trends of changes in the bullhead mass parasitic species composition and… (More)
Juveniles of Atlantic salmon Salmo salar and trout S. trutta populating the system of the Tornio River (the Baltic Sea basin) are investigated. The obtained parasitological data indicate the absence of rigid spatial and food competition between juvenile salmon and trout in the case of their cohabitation.
The data on parasite fauna of brown trout Salmo trutta, whitefish Coregonus lavaretus, and grayling Thymallus thymallus from lake-river system Paanajarvi-Olanga (White Sea basin) are presented. As lake-river systems on this area remain in natural conditions, without any anthropogenic pressure, the parasite fauna of Salmonidae in these water bodies had not… (More)