Invasion

Invasion Description

1st Record: CA/Sacramento-San Joaquin Delta (1964, Cohen and Carlton 1995)

1st Watershed Record? CA/Clear Lake, Sacramento rRver basin (1950, Dill and Cordone 1997)

Geographic Extent

CA/Sacramento-San Joaquin Delta (1964, Cohen and Carlton 1995; 5th in abundance in freshwater marhes, Grimaldo et al. 2012); CA/Suisun Slough 1979-1999, Matern et al. 2002);