Invasion

Invasion Description

1st Record: WA-OR/Columbia River (1973, Carlton 1979; Probably introduced much earlier)

Geographic Extent

WA-OR/Columbia River (Gaumer et al. 1974, cited by Carlton 1979); Ilwaco/WA/Baker Bay, Columbia River (2002, Sytsma et al. 2003; 1999, Wilson amd Partidge 2007)); OR/Trestle Bay, Columbia River (2002, Sytsma et al. 2003)