Invasion information | ||
Range in Japan | Honshu, Shikoku, Kyushu Islands. | |
Origin | USA | |
Date | Introduced to Tokyo (Koishikawa Botanical Garden) in 1929. Naturalized around Tokyo, in 1950. | |
Route | Deliberate: As ornament in aquarium. | |
Impact | Competition with native species. Native organism(s) affected: Native aquatic plants. | |
Regulation in Japan | Release of this species is prohibited in Aichi Pref. | |
Introduced range in other countries | East Asia, Europe. |
Reference | Notes |
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