Invasion

Invasion Description

1st Record: CA/Sacramento-San Joaquin Delta (1966, Hazel and Kelly 1966, cited by Cohen and Carlton 1995)
1st Watershed Record: Near Pasadena/CA/South San Francisco Bay drainage (1924, Cohen and Carlton 1995, widespread in the Sacramento-San Joaquin valley by 1959, Riegel 1959), 1st Record: Castroville/CA/Tembladero Slough near Salinas River mouth (1959, Riegel 1959)

Geographic Extent

CA/Sacramento-San Joaquin Delta (1966, Hazel and Kelly 1966, cited by Cohen and Carlton 1995); Shell Marsh east of Martinez/CA (1995, Cohen and Carlton 1995); Alameda/CA/Coyote Hills Marsh (Cohen and Carlton 1995), Castroville/CA/Tembladero Slough near Salinas River mouth (1959, Riegel 1959). However, Procambarus clarkii was listed only as a potential invader in the Elkhorn Slough National Estuarine Research Reserve (Elkhorn Slough National Estuarine Research Reserve Foundation 2002).