[Metazoan parasites of fishes from the Bug River].

Results if the ichthyoparasitological investigation of the Bug River carried out in 1996-1999 are reported. Twenty-nine metazoan parasite species from 7 classes were found in fishes from the studied area, with the total infestation rate 63.9%. Thirteen of them parasitize fish at larval stages. Metacercariae of Opisthorchis felineus, which ate the agents of opisthorchosis in man and animals, were found in roach.