Invasion

Invasion Description

1st Record: Vancouver Island/British Columbia/Pacific Ocean (Hasselman et al. 2012a)

Geographic Extent

British Columbia/Fraser River (nonbreeding?); WA/Puget Sound and drainage (1882, but recently increasing, breeding?); WA-British Columbia/straits of Juan de Fuca and Georgia (Pietsch and Orr 2015, occasional); San Juan Islands/WA/Georgia Strait (Pietsch and Orr 2015); WA/Bellingham Bay and Puget Sound south to the Tacoma Narrows and off Olympia, including Hood Canal (Pietsch and Orr 2015); WA-British Columbia/Fraser, Skagit, Stillaguamish, Snohomish, and Nooksack Rivers (Pietsch and Orr 2015); Wrangell Island/AK/Stikine River (1893, Hasselman 2012a) Breeding of Alosa sapidissima is uncertain in this region's rivers, but this fish is a regular migrant in freshwater and coastal waters (Hasselman 2012a; Pietsch and Orr 2015))