Public health aspects of fish parasites. Methods. Some norht american fish parasites listed by location in the fish. Brief descriptions of the groups of fish parasites. Algae and fungi. Protozoa. Monogenetic trematodes. Adult digenetic trematodes. Metacercarial trematodes. Cestodes. Nematodes. Acanthocephala. Leeches. Parasitic copepods. Miscellaneous parasites. Fish parasites found on or in other animals. Predators. Fish and parasite check-list.