Abstract
AbstractPraziquantel, an anthelmintic, is commonly used to control the Asian fish tapeworm Bothriocephalus acheilognathi in grass carp Ctenopharyngodon idella and baitfish. We treated 50 individuals from three different cyprinid fish species with praziquantel at 6 mg/L, a dose higher than the minimum recommended for complete Asian tapeworm removal in 24 h but much less than the concentration that would have ill effects on the fish. Praziquantel killed hundreds of adult tapeworms, but many ruptured and released eggs. We observed that the eggs released from Asian tapeworms treated with praziquantel were viable and produced thousands of coracidia over several days. We warn fishery managers that even if fish receive the typically recommended praziquantel treatment regime and all adult tapeworms are killed, viable eggs and coracidia may be present in the holding water or attached to the skin of treated fish, the surfaces of equipment, or treatment personnel.
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