Invasion

Invasion Description

1st Records: Napa/CA/Napa Oreek (1874, Smith 1895, 73 fish from Lake Champlain, VT, fishe out); Union City/CA/Alameda Creek (1874, Smith 1895, 12 fish from Michigan, established populaiton);

Additonal stockings occurred in 1879 and 1889-1895 in the San Francisco estuary watershed, and in many other Calfornia watersheds (Smith 1895; Dill and Cordone 1977).

Geographic Extent

CA/Sacramento-San Joaquin Delta (Wang 1986; Cohen and Carlton 1995; Dill and Cordone 1997; Moyle and Randall 1999, rare in Delta, mostly in dead-end sloughs); Walnut Grove/CA/North Fork Mokelumne River (Cavallo et al. 2012); CA/Napa River (Leidy 2007, locally common); CA/Alameda Creek (Leidy 2007, locally common); CA/San Lorenzo, Coyote creeks,; Guadalupe Rivers (Leidy 2007)