Many encysted metacercariae of Clinostomum complanatum(Rudolphi, 1814) were found in the flesh near the skin of goldfish(Carassius auratus) sultured at a fish farm in Chonbuk Province, Korea, in the summer of 1995. The mortality reached about 7% from July 10 to August 20. Encysted and excysted metacercariae were$700sim877{ imes}700sim775{mu}m$ and $2.4sim5.5{ imes}0.7sim1.37{mu}m$ in size, respectively. The parasites looked yellowish due to the yellow particulate matter in the intestine. Of 276 fish examined, 234(84.8%) were infected with a mean intensity of 216.6(range 1~1.214) parasites. Fish of 2.0~2.5 cm in body length were most frequently(94.3%) infected but those of 3.1~3.5 cm were the least infected(75.27%). The isthmus was most heavily infected. There was no difference in prevalence between two forms of goldfish, Gyariko an Ryugum. The sites of infection were swollen and recognized as yellow spots of 0.4~0.8 mm in diameter. Fish infected with more than 200 metacercariae became moribund with listless swimming and finally died.