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マツカサガイ幼生の宿主としてのホトケドジョウ
伊藤 寿茂(1), 丸山隆(2)
　(1)新江ノ島水族館
　(2)東京海洋大学

Abstract:　The availability of the Japanese Japanese eight-barbel loach Lefua echigonia as a host fish for the glochidia of the unionid mussel Pronodularia japanensis was investigated. The hosts to which the glochidia were attached in a paddy field ditch were cultured in tanks (6l，28±0.5℃) for nine days. Glochidia and juveniles that became detached from the hosts were counted daily. Juveniles appeared about six days after glochidia attachment.
L. echigonia is thought to be a suitable host, on which over 10% of attached glochidia metamorphosed to juveniles.