Species Regional Summary
Pacifastacus leniusculus
San Francisco Bay ( P090 )

Invasion History Vectors Impacts References

Invasion

Invasion Description

1st record: CA/Sacramento-San Joaquin Delta (1959, Reigel 1959, cited by Cohen and Carlton 1995) 1st Watershed record: San Francisco County/CA (1898, Kimsey 1982, cited by Cohen and Carlton 1995)

Geographic Extent

Yount Cross Road E of Yountville/CA/Napa River (1975. USNM 176805, US National Museum of Natural History 2007, in upper Napa watershed); CA/Sacramento-San Joaquin Delta (1959, Reigel 1959, cited by Cohen and Carlton 1995); CA/San Francisco County (Kimsey 1982, cited by Cohen and Carlton 1995); Mill Valley/CA/Widow Reed Creek, Richardson bay drainage (1975, USNM 176836, US National Museum of Natural History 2007)

Vectors

Level Vector
Probable Fisheries Intentional

Regional Impacts

Economic ImpactFisheries
Pacifastacus leniusculus is the major crayfish species caught in the San Francisco Bay Delta, supporting a fishery of 250 tons annually (Cohen and Carlton 1995).
 
Ecological ImpactCompetition
Pacifastacus leniusculus may have contributed to the extinction of a native crayfish (P. nigrescens, Sooty Crayfish), and is considered to be a competitor threatening another native crayfish, P. fortis (Shasta Crayfish) (Cohen and Carlton 1995).
 

References

Full Reference List for Pacifastacus leniusculus

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