Seasonality of <i>Clinostomum complanatum</i> Cercariae in the Snail Host <i>Radix auricularia japonica</i> and Drug Treatment of the Parasite in Goldfish <i>Carassius auratus</i>

Clear peaks of trematode Clinostomum complanatum cercariae detection rate in snails Radix auricularia japonica were observed around July a goldfish Carassius auratus farm Aichi Prefecture. ​Effects Trichlorfon and praziquantel examined against C. artificially infected goldfish. ​Both effective the early phase infection cohabitating with snails. ​Trichlorfon was 300 mg/t bath treatment for 13 d 3 oral administration at 138 mg/kg body weight. ​Tratements trichlorfon or may reduce without serious damage to fish caused by excystation induced drug ornamental farms.