Infectiousness of freshwater fishes by parasites in rivers of the Jewish autonomous region

This paper presents the results of preliminary parasitological study of fish in the Amur River (on the territory of the Jewish Autonomous Region) and its tributaries i.e. the rivers of Bira and Bijan. Fish fauna of the Amur basin includes at least 128 spe-cies, many of which are harvested and eaten by local human population throughout the year. En-demic to the Far East helminthiasis (for example metagonimoz, nanofietoz and clonorchiasis caused by trematodes) are registered each year in the re-gion, for which Amur fish are additional hosts. The aim of this work was to conduct parasitological re-search of fish living in the Amur River (on the terri-tory of the Jewish Autonomous Region) and its trib-utaries, for the prevention of helminthiasis transmit-ted through the fish. 84 samples of fish were inves-tigated by the incomplete helminthologicallresearch and compressor for the period from April to October 2015. The study revealedtheinfestation of fish by three species of trematodes: Metagonimus yokogawai, Nanophyetus salmincola schikhobalowi, Clonorchis sinensis, which are en-demic to the Amur region, including the Jewish Au-tonomous Region. In general this fish was relatively clean. Of the 18 samples, more than half, i.e. 11 (61 %) turned out to be zero, which indicates a weak parasitic infestation and the relative purity of studied fish by this group of worms that are epide-miological importance parasites. Fish of the family Cyprinidae (Carp) was infested by trematodes. These fish are the intermediate hosts and have a commercial value for the region. The quality of caught fish during the period from April to June 2015 is satisfactory, but requires processing of in-fested fish providing larval mortality.