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| name | Western mosquitofish |
| scientific name | Gambusia affinis |
| kind | Cyprinodontiformes/Poeciliidae |
| native | Southeastern part of North America. |
Since 1916 via Taiwan, distributed nationwide for mosquito control.
Eastern and south-western (not northern) parts of Japan.
Competition with Japanese medaka Oryzias latipes.
Fujioka (2000); Sawara (2002); Takemon et al. (2002)