Invasion

Invasion Description

1st Record: Kalama/WA/Columbia River (1930, Chapman 1942)

Geographic Extent

Kalama/WA/Columbia River (1930, Chapman 1942); Portland/OR/Willamette River-Columbia River (Chapman 1942; Farr and Ward 1993); Portland/OR/Columbia Slough (Van Dyke et al. 2009)