Invasion

Invasion Description

1st record: Netherlands/'the Helder' (1913, Braber and Borghouts 1977; Wolff 2005)

Geographic Extent

Hampshire/England/Beaulieu River (Stephenson 1935); Lowestoft (Sussex)/England/English Channel (Stephenson 1935); Norfolk/England/English Channel (Stephenson 1935); Northumberland/England/North Sea (Stephenson 1935);  Netherlands/Lake Veere (Braber and Borghouts 1977; Wolff 2005); Oostende/Belgium/Sluice Dock, North Sea (1998, Kerckhof et al. 2007); Le Havre/France/English Channel (Breton et al. 1996); Busum/Germany/North Sea, outside the Elbe estuary (1920-1924, Gollasch and Reimann-Zurnick 1996, extinct); on hull of 'Nosac Sun', Hamburg Harbor/Germany/Elbe estuary (Gollasch and Reimann-Zurnick 1996); Northern Ireland/Mahee Island Narrows,Strangford Lough (2012, Nunn and Minchin 2013)