Invasion

Invasion Description

1st record: CA/San Francisco Bay (1897, Voigelsang and Gould 1900, cited by Carlton 1979, 162 animals planted)

Geographic Extent

CA/San Francisco Bay (1897, Voigelsang and Gould 1900, cited by Carlton 1979, 162 animals planted); Tracy Pumping Plant/CA/Sacramento-San Joaquin Delta (1994, one specimen, Cohen and Carlton 1995); CA/San Francisco Bay ('sporadic reports from Bay area waters in recent years, Cohen and Carlton 1995)