| Invasion information | ||
| Range in Japan | Lake Kasumigaura and Lake Kitaura, Ibaraki Pref. Reservoirs along the Tone River including Chiba, Tokyo, Saitama and Tochigi prefecture. |
|
| Origin | Continental China | |
| Date | The first record in Japan was in 2001, at Lake Kasumigaura, and it is assumed that establishment was by 1999. In Lake Kitaura, recorded since 2003. | |
| Route | Possibly deliberate: release of pet animal, or accidental: Hitchhiking on carp seedling or pearl bivalve for aquaculture. | |
| Impact | Competition, hybridization with native fishes. Native organism(s) affected: Native bitterlings. | |
| Regulation in Japan | Invasive alien species (Invasive Species Act) Keeping and release of this species in Shiga Pref. are controled by a prefectural ordinance. | |
| Introduced range in other countries | None. | |
| Reference | Notes |
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