Invasion

Invasion Description

1st record: Alameda/CA/San Francisco Bay (1901, failed, Keep 1901, cited by Carlton 1979)

Geographic Extent

CA/Tomales Bay (stocked in 1956 and 1963, failed, Carlton 1979); CA/Drakes Estero (stocked in 1956 and 1963, failed, Carlton 1979); Alameda/CA/San Francisco Bay (1901, failed, Keep 1901, cited by Carlton 1979); Coyote Point/CA/San Francisco Bay (1968, 6 live specimens, Carlton 1979); CA/Morro Bay (1963, failed, Carlton 1979); north of San Mateo Bridge, Burlingame/CA/South San Francisco Bay (3/22-5/20, 1981, Chew 2001, 4 plantings of 19,000 to 55,700 clams each, no further records); Foster City/CA/South San Francisco Bay (3/27/1981, Chew 2001, 2700 clams planted, no further records)