- vol.40, pp.45-64, 2014-03-01
The fish fauna of the Ano River in Mie Prefecture, central Japan, was surveyed between May 2013 and August 2013. A total of 1242 individuals of 38 species belonging to 15 families were collected from 13 stations and 3 species belonging to 3 families were visually confirmed. Six species, Dasyatis akajei, Opsariichthys uncirostris uncirostris, Microphis(Oostethus)brachyurus brachyurus, Plectorhinchus cinctus, Kuhlia marginata, Rhinogobius sp. BF, Rhinogobiussp. OM were newly added to the fish fauna of the Ano River. Six alien species were collected and seven species of threatened fishes in red list of Ministry of Environment Japan or in red databook of Mie Prefecture, such as Cottus reinii were collected. Two of these alien species, Micropterus salmoides and Lepomis macrochirus macrochirus were designated “Invasive Alien Species” by Invasive Alien Species Act (Law of Japan). Other four species, Acheilognathus rhombeus, Opsariichthys uncirostris uncirostris, Rhinogobius sp. OM, and Tachysurus nudiceps were domestic alien speceies and the former three species were evidently introduced from Lake Biwa basin. It seemed that a dam(1.8m in hight) which constructed in the middle leach of the river disturb diadromous migration. Control of alien species and improvement of the fish way on the dam are necessary to conserve fish biodiversity in the Ano River.