Invasion

Invasion Description

1st record: NY-NJ/Hudson River (Bousfield 1973; Mills et al. 1997, introduced by canals from Delaware Bay?). Evidence for the canal vector is lacking. The Delaware and Hudson Canal was in operation only briefly, and was not a continous water connection, requiring boats to be hauled on inclined planes over the height of land (Baer 1991). This amphipod could easily be overlooked, given iis similarity to G. trigrinus and G. fasciatus.

Geographic Extent

NY-NJ/Hudson River (Bousfield 1973; Mills et al. 1997, introduced by canals from Delaware Bay?)