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Fresh-water fish collected in the river Wichon in Kyungpook Province, Korea, were examined for the presence of the encysted larvae of digenetic trematodes from July to October in 1991. Seven species of digenetic larval trematodes including unknown species were found from, 12 species of fish examined. The metacercaria of Clonorchis sinensis was found from 6 species and that of Cyathocotyle orientalis from 9 species of fish examined. The cyst of Exorchis oviformis was found from 10, Metacercaria hasegawai from 8, Metorchis orientalis from 3 and Echinochasmus species from 7 species of fish examined. Incidence of infestation with C. sinensis in the korean shiner, Gnathopogon atromaculatus, the sandy fish, Microphysogobio koreensis, the southern top-mouthed minnow, Pseudorasbora parva and the striped shiner, Pungtungia herzi were found to be high. However, the intensity was heavy in G. atromaculatus, P. parva and P. herzi. Incidence and intensity of the other encysted larvae of digenetic trematodes varied from fish to fish and was low except for K oviformis from the flat bitterling, Paracheilognathus rhombea, and Echinochasmus species from P. rhombea and P. herzi. It was found that the source of infection with digenetic larvel trematodes in man is still remaining in the river Wichon.
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