INFECTION OF ALIEN AND NATIVE FISH SPECIES OF THE FAMILY CYPRINIDAE WITH OPISTHORCHID METACERCARIAE IN THE NOVOSIBIRSK WATER RESERVOIR

The article presents the materials of the parasitological study of fish of the family Cyprinidae caught in waters of the Novosibirsk water reservoir. Opisthorchis metacercariae were detected using the compression method with subsequent calculation of parasitological parameters of the prevalence (P), the invasion intensity (II) and the abundance index (AI). The obtained results show that introduced fish species (bream, verkhovka), and native fish species (dace, roach, ide) had trematodes of the family Opisthorchiidae of 3 species: Opisthorchis felineus, Metorchis bilis and M. xanthosomus. Infection differences were established in alien fish species and introduced fish species both among themselves and in the designated groups as for interspecific differences in the infection of cyprinids with trematode larvae. The average infection was 6.5% in alien fish species, including 3.2% with O. felineus, 2.9% with M. bilis and 0.9% with M. xanthosomus. The Opisthorchidae infection in native species was recorded at the level of 20.4%, including 15.9% with O. felineus metacercariae, 3.9% with M. bilis metacercariae and 3.4% with M. xanthosomus metacercariae. All the fish studied were found to have a mixed O. felineus and M. bilis infection. Based on the data obtained, it can be stated that introduced fish species are potentially dangerous, since they are the same source of Opisthorchidae infection in humans and animals as native fish species.