Invasion

Invasion Description

1st Record: Denmark-Sweden/Kattegat (1928, Panning 1939; Herborg et al. 2003) Occurrences of ripe adults in Lake Vanern and the Cota Canal suggest the possibility of a breeding population in the Kattegat-Skagerrak (Drotz et al. 2010)

Geographic Extent

Denmark-Sweden/Kattegat (1928, Panning 1939; Herborg et al. 2003); Goteborg/Sweden/Bay of Älvsborgsfjorden, (1936, Drotz et al. 2010); Karlsborg/Sweden/Gota Canal (1937, Drotz et al. 2010)