Abstract
Metacercariae of the genus Diplostomum are localized in the eyes and the brain of freshwater fish and cyclostomata species causing different types of diplostomosis. Hyperinvasion by these parasites lead to spatial disorientation, changing in feeding activity, lowering the growth rate, etc. Species identification of Diplostomum spp. based on the morphological features is difficult due to the lack and severity of them. In present study, species diversity of the genus Diplostomum metacercariae parasitizing in fishes of Chany, Baunt and Teletskoye lakes is defined according to the DNA-barcoding approach based on mtDNA fragment cox1 (595 bp). Parasite sequences from the fishes inhabited studied lakes formed 11 clades of the species level. The lowest diversity was noted for an eutrophic Lake Chany – 3 species, whereas for an oligotrophic lakes Teletskoye and Baunt – 8 species were found.
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