Pijawki (Hirudinea) pasożyty ryb

Basing on the literature data and own observations the author presents the pattern of infection of freshwater fishes, mainly in Europe with particular species of Ichthyobdellidae. A particular attention has been paid to the intensity of infection, direct and indirect results of the phenomenon being presented. Some information on the methods of prophylaxix and control of the parasites in fish farms.