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A large number of fish species, both marine and freshwater, are potential sources of medically important parasitic zoonoses. Some of these zoonoses are highly pathogenic, and the main cause of human infection is the consumption of raw or inadequately cooked fish. These infections are prevalent in only a few countries in the world and are found primarily among communities where eating raw or inadequately cooked fish is a cultural habit. Generally fish are the intermediate hosts of the parasites, and humans become the definitive host when the parasites are ingested. The principal human diseases are trematodiasis, cestodiasis and nematodiasis.