National Institute for Environmental Studies Invasive Species of Japan Japanese | English
  1. Invasive Species of Japan >
  2. Invertebrates (except insects) Alert List >
  3. Mnemiopsis leidyi

Mnemiopsis leidyi

Basic information
Scientific name Mnemiopsis leidyi (No picture)
Common names Sea walnut
Higher taxon Bolinopsidae, Lobatae, Tentaculata, Ctenophora
Natural range Atlantic Ocean along N to S America
Habitat Coastal region to river mouse.
Invasion information
Range in Japan Not established in Japan Range in Japan
Route Accidentaly introduced via ballast water.
Impact Mass generation and predation on zooplankton. Competitive with fishes.
Native organism(s) affected: Zooplankton, carnivorous fishes
Regulation in Japan
Introduced range in other countries Black Sea, Caspian Sea, Mediterranean Sea.
Reference Notes
  • DECO (ed) (2006) Dictionary of Alien Species. Tokyo-Shoseki. (in Jpn)
  • JWRC (ed) (2008) A Photographic Guide to the Invasive Alien Species in Japan. Heibonsha. (in Jpn)
  • etc.
One of the 100 of the World’s Worst Invasive Alien Species.