Invasion

Invasion Description

1st record: Carcinus spp. were recorded at Tokyo Bay in 1984 (Date erroneously given as 1958 by Sakai 1986, cited by Carlton and Cohen 2003). Both C. aestuarii (from the Mediterranean) and C. maenas are present in Japan. DNA data of Bagley and Geller (2000) suggest that there was a single source population which included both species. This is supported by further analysis of nuclear and mitochondrial DNA of Japanese populations and source populations of the two species (Darling 2011).

Geographic Extent

Honshu/Japan/Tokyo Bay (1984, Carlton and Cohen 2003); Honshu/Japan/Sagami Bay (1999, Carlton and Cohen 2003); Honshu/Japan/Osaka Bay (1999, Carlton and Cohen 2003); Kyushu/Japan/Dokai Bay (1999, Carlton and Cohen 2003)