Invasion information |
Range in Japan |
Tonegawa River System (Chiba and Ibaraki Prefs.), Edo River and Ara River(Tokyo and Saitama Pref.)Lake Oshio (Gumma Pref.), Tenryu River (Shizuoka Pref.), Uregawa River (Aichi Pref.), Kisogawa River System (Gifu, Aichi and Mie Prefs.), and Lake Biwa-Yodogawa River System (Shiga, Kyoto, and Osaka Prefs.). |
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Origin |
Possibly continental China and Korea |
Date |
Introduced to western Japan in 1990s and to Kanto District by 2004. |
Route |
Accidental: Hitchhiking on imported fresh water clams, ballast water, or fouling on ships. |
Impact |
Actually: Disturb water channels by mass fouling. An initial intermediate host of trematodes. Native organism(s) affected: Fishes and some other aquatic species. |
Regulation in Japan |
Import, transport and keeping of genus Limnoperna are prohibited in Japan by the Invasive Alien Species Act. |
Introduced range in other countries |
East Asia, South America |