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Oncorhynchus mykiss

Basic information
Scientific name Oncorhynchus mykiss

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ニジマス
Common names Rainbow trout, Steelhead
Higher taxon Salmonidae, Salmoniformes, Actinopterygii
Natural range Pacific coastal area of Kamchatka, Alaska, to Baja California.
Habitat Well oxygenated clear freshwater. Usually fast stream, and sometimes lakes and dams. Some population anadromous.
Invasion information
Range in Japan Hokkaido, Tokyo, Wakayama (Kumanogawa River System), and Chugoku District Range in Japan
Origin California, USA.
Date 1877 or later.
Route Deliberate: For aquaculture and sports fishing.
Impact Actually: Competition with native salmoid fishes. Eggs of salmoid fishes (such as white spotted char) are laid waste due to late oviposition of rainbow trout. In foreign country, competition and hybridization with other salmoid fishes and predation on crustaceans.
Affected organism: Native salmoid fishes, freshwater insects and crustaceans, etc.
Regulation in Japan Introduction of this species is prohibited in Shiga and Saga Pref. Capture of this species is regulated by several local governments.
Introduced range in other countries Worldwide, Korean Peninsula, Pakistan, Sri Lanka, W Asia, C Asia, Europe, E & S Africa, Madagascar, Australia, New Zealand, Papua New Guinea, Canada, C & S America, Dominica, Hawaii, Azores Is., Madeira Is., Kerguelen Is., Reunion, etc.
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki, Tokyo (in Jpn)
  • Ecol Soc Japan (ed) (2002) Handbook of Alien Species in Japan. Chijin-Shokan. (in Jpn)
  • Froese & Pauly (eds) (2009) FishBase (Accessed on 2010-12-13) http://www.fishbase.org/.
  • 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)
100 of the World’s Worst Invasive Alien Species, 100 of the Japan’s Worst Invasive Alien Species