Invasion

Invasion Description

1st record: Amsterdam/Netherlands/Zaan River (1932, Wolff 2005). Most occurrences are scattered in space and time, but established populations occur in thermal effuent areas in the Netherlands and Belgium (Wouters 2002; Wolff 2005; Kerckhof et al. 2007; Nehring and Van der Meer 2010)

Geographic Extent

Germany/Elbe estuary (1964, Nehring and Van der Meer 2010; Nehring 2011); East Frisia/Germany/Accumersieler Balje, Wadden Sea (2008, Nehring and van der Meer 2010, female with fertile eggs, 53° 43.7'N and 7°27.1'E; Nehring 2011); Germany/Weser Estuary (1965, 1990, 1990, 1998, 2007, Nehring and Van der Meer 2010; Nehring 2011); Amsterdam/Netherlands/Zaan River and Nordzeekanal (1932, Wolff 2005); Amsterdam/Netherlands/Entrepothaven (1934, Wolff 2005, possibly established); Bayer Antwerpen factory cooling pond, Antwerp/Belgium/Schelde estuary (1981, Kerckhof et al. 2007, established); cooling system, nuclear power plant, Doel/Belgium/Schelde estuary (1993, Wouters 2002, established); Dover/England (1972, http://www.frammandearter.se/0/2english/pdf/Callinectes_sapidus.pdf); Malo des Bains, near Dunkerque, Normandy/France/English Channel (1984, Vincent 1999); Gravelines, Normandy/France/English Channel (1995, Vincent 1999); Bray-Dunes/France/English Channel (1995, Vincent 1999); Le Havre/France/Seine Estuary (1974, 1981, 1982, 1984, 1996, 1997, 1997, established?, Vincent 1999); Littlestone-on-Sea, Kent/England (1975, Nehring 2011); Dunham Bridge/England/River Trent (Humber estuary tributary) (1982, Nehring 2011); Erith/England/Thames River (2000, Nehring 2011)