The parasite fauna of the big and little Baikal oil fishes

The parasite fauna of two endemic fish species of the genus Comephorus (Cottoidei: Comephoridae) includes 11 species. Six species were found in Comephorus baicalensis and 9--in C. dybowskii. Two species only are endemic for Baikal: Myxidium perniciosum and Gyrodactylus comephori. Other 9 species are distributed throughout Palaearctic region. Ecology of parasites and their hosts is briefly discussed.