Invasion

Invasion Description

1st Record: Bornholm/Denmark/Baltic Sea (1895, Jensen and Knudsen 2005). However, this species was probably introduced within a few decades after canal construction in 1768-1775 (Olenin 2002).

Geographic Extent

Bornholm/Denmark/Baltic Sea (1895, Jensen and Knudsen 2005); Poland-Sweden/Baltic Sea (Arndt 1984); Szczecin/Poland/OdraRiver estuary (Arndt 1984); Brzeg/Oder River (Arndt 1984); Poland/4 coastal lakes (Liwia ?uza, Resko Przymorskie, Jamno, Bukowo) (2005-2009, Obolewski et al. 2015, 0-~5 PSU)