Parasitofauna of Arctic Cisco Coregonus autumnalis (Pallas, 1776) and Humpback Whitefish Coregonus lavaretus pidschian (Gmelin, 1788) in the Yenisei River
In the present study, we present the results of a parasitological study of the arctic cisco Coregonus autumnalis (Pallas, 1776) and the humpback whitefish Coregonus lavaretus pidschian (Gmelin, 1788), caught during spawning migration in a lower course of the Yenisei River (district of Dudinka town) in 2019. We identified 16 species of parasites from 8 taxonomic groups. The parasite fauna of the arctic cisco is dominated by cestodes Diphillobothrium (prevalence 100 %) and the acanthocephala Echinorhynchus salmonis Muller, 1780 (prevalence 73 %). The dominant species in the humpback whitefish parasite fauna are the trematodes Ichthyocotylurus erraticus (Rudolphi, 1809) Odening, 1969 (prevalence 87 %) and Ichthyocotylurus pileatus (Rudolphi, 1809) Odening, 1969 (prevalence 69 %), the cestode Cyathocephalus truncatus (Pallas, 1781) (prevalence 73 %), and the acanthocephala E. salmonis (prevalence 67 %). The results were compared with the data of the 1940 study: the level of similarity of the species composition of the arctic cisco’s parasite fauna is lower than the level of similarity in the humpback whitefish, the composition of dominant species of the humpback whitefish did change.