Gambusia affinis

Basic information
Scientific name	Gambusia affinis	Click to magnify
Common names	Mosquitofish, Topminnor
Higher taxon	Poeciliidae, Cyprinodontiformes, Actinopterygii
Natural range	USA (Mississippi River) to N Mexico
Habitat	Slow streams, canals irrigation. Tolerant to high salinity and water pollution. Do not require aquatic grass for oviposition.

Invasion information
Range in Japan	Fukushima Pref. and southern part of Honshu, Shikoku, Kyushu, Okinawa, and Ogasawara Islands.
Origin	Taiwan
Date	The first introduction was in 1916 to Nara Pref. Since 1970, distributed throughout Japan.
Route	Deliberate: Control of mosquito.
Impact	Competition with Medaka (Oryzias latipes). Predation on juvenile Medaka. Native organism(s) affected: Medaka Oryzias latipes
Regulation in Japan	Import, transport and keeping are prohibited by the Invasive Alien Species Act.
Introduced range in other countries	Worldwide, including many small Pacific islands.

Reference

Notes

DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki, Tokyo (in Jpn)
Ecol Soc Jpn (ed) (2002) Handbook of Alien Species in Japan. Chijinshokan, Tokyo (in Jpn)
Froese & Pauly (eds) (2009) FishBase (Accessed on 2010-12-10) http://www.fishbase.org/search.cfm
JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha, Tokyo (in Jpn)
Kawanabe et al. (eds) (2002) Freshwater Fishes of Japan, 3rd ed.. Yama-kei Publishers, Tokyo (in Jpn)
Matsuzawa & Senou (2008) Alien fishes of Japan. Bun-ichi Sogo Shuppan, Tokyo (in Jpn)
etc.

100 of the World’s Worst Invasive Alien Species and 100 of the Japan’s Worst Invasive Alien Species.