Biwia zezera

Basic information
Scientific name	Biwia zezera	(No picture)
Common names	Zezera
Higher taxon	Cyprinidae, Cypriniformes, Actinopterygii
Natural range	The Nobi Plain, Biwako-Yodogawa River System, Sanyo area and NW Kyushu.
Habitat	Lower part of river and lowland lakes and ponds.

Invasion information
Range in Japan	Kanto District, Niigata Pref., and NW Kyushu.
Origin	Biwako Lake, Japan.
Date	Unknown. In Kasumigaura Lake, Ibaraki Pref., occur since 1960.
Route	Accidental: Hitchhiking on seed release of ayu (Plecoglossus altivelis altivelis).
Impact	Hybridization with native conspecific population in NW Kyushu. Unknown impact in other region. Native organism(s) affected: Native population of B. zezera
Regulation in Japan	No action for prevention, mitigation, control, or eradication.
Introduced range in other countries	None.

Reference

Notes

Froese & Pauly (eds) (2009) FishBase (Accessed on 2010-12-06) http://www.fishbase.org/search.cfm
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)
Yanai et al. (2008) The introduction process in alien fishes found from Lake Kasumigaura and Kitaura. Bull Ibaraki Pref Freshwater Fishery Exper St. 41, 47-54 (in Jpn)