秋に放出された琵琶湖産ドブガイ属幼生の宿主魚類

抄録

Host species for the glochidia of the freshwater unionid mussel Sinanodonta sp. from Lake Biwako were identified by determining whether the glochidia infected 18 fish taxa in autumn. The fishes were kept in tanks for 11–16 days after glochidial infection, and the numbers of glochidia and metamorphosed juveniles detached from the hosts were counted. All adults of the mussel which used for the experiments were identified by Sinanodonta calipygos from the form of shells and season of released glochidia. Living juveniles of S. calipygos detached from Candidia temminckii, Oryzias sp., Acanthogobius flavimanus, Gymnogobius urotaenia, Trichogaster trichopterus, Rhinogobius similis and Rhinogobius sp. Therefore, these fishes were identified as suitable host species for the glochidia of S. calipygos. Some native fishes that inhabit Lake Biwako (e.g., Gymnogobius urotaenia and Rhinogobius sp.) are considered to be useful local hosts.