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  3. Elodea nuttallii

Elodea nuttallii

Basic information
Scientific name Elodea nuttallii

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Common names Florida elodea, Nuttall’s waterweed, esthwaite waterweed
Higher taxon Hydrocharitaceae, Alismatales, Liliopsida, Magnoliophyta
Natural range NE North America.
Habitat Lake or pond, stream, waterfront.
Invasion information
Range in Japan Kanto District to western Japan. Range in Japan
Origin Unknown.
Date Imported as an experimental material for physiology in 1920s-1930s. Feral population was recorded in 1961 at Biwako Lake, Shiga Pref.
Route Deliberate: As an experimental material for physiology.
Impact Competition with native species. Prevention of water current.
Native organism(s) affected: Native submerged plants (e.g., Hydrilla verticillata)
Regulation in Japan Keeping of this species in Saga Pref. are controled by a prefectural ordinance. Import to Australia is prohibited.
Introduced range in other countries Europe, East Asia.
Reference Notes
  • Ecol Soc Jpn (ed) (2002) Handbook of Alien Species in Japan. Chijinshokan, Tokyo (in Jpn)
  • Osada (1976) Colored Illustrations of Naturalized Plants of Japan. Hoikusha, Tokyo (in Jpn)
  • Shimizu (ed) (2003) Naturalized Plants of Japan. Heibonsha, Tokyo (in Jpn)
  • etc.
100 of the Japan’s Worst Invasive Alien Species.

For eradication of this species, grass carp Ctenopharyngodon idella was introduced in 1980s in Kizaki Lake of Nagano Pref. As a result, ecosystem of this lake was seriously changed.