Host Species for Glochidia of the Freshwater Unionid Mussels, Hyriopsis schlegeli, Inversiunio jokohamensis and Sinanodonta spp. in Lake Anenuma, Aomori Prefecture, Japan

Abstract

The host species for the glochidia of the freshwater unionid mussels, Hyriopsis schlegeli, Inversiunio jokohamensis and Sinanodonta spp. were identified by determining whether these glochidia had infected the following fish taxa collected from Lake Anenuma in Aomori Prefecture, Tohoku area, Japan: Carassius cuvieri, Carassius sp., Acheilognathus melanogaster, Rhodeus ocellatus ocellatus, Tribolodon hakonensis, Pseudorasbora parva, Misgurnus anguillicaudatus, Silurus asotus, Hypomesus nipponensis, Pungitius sp. 1, Tridentiger brevispinis, Rhinogobius spp. and Gymnogobius castaneus. The fishes were kept in tanks for 2-8 days, and the numbers of glochidia and metamorphosed juveniles detached from the hosts were counted. Living juveniles of H. schlegeli detached from the bodies of S. asotus, Trid. brevispinis, and G. castaneus. Living juveniles of I. jokohamensis detached from the bodies of Trib. hakonensis, Trid. brevispinis, and G. castaneus. Living juveniles of Sinanodonta spp. detached from the bodies of only G. castaneus. These fishes were identified as suitable new host species for the glochidia of H. schlegeli, I. jokohamensis and Sinanodonta spp. in Lake Anenuma.