Invasion
Invasion Description
1st Tidal Record: CA/Sacramento-San Joaquin Delta (1959, Riegel 1959; Cohen and Carlton 1995)
1st Watershed Record: Chico/Buttte County/Sacramento County (1941, Cohen and Carlton 1995)
Geographic Extent
Chico/Buttte County/Sacramento County (1941, Riegel 1959; Cohen and Carlton 1995); CA/Sacramento-San Joaquin Delta (1959, Riegel 1959; Cohen and Carlton 1995); Sacramento County/CA/Cosumnes River (Riegel 1959; Cohen and Carlton 1995); Sacramento County/CA/Putah Creek (Riegel 1959; Cohen and Carlton 1995)
Vectors
| Level | Vector |
|---|---|
| Alternate | Discarded Bait |
| Alternate | Scientific Escape |
Regional Impacts
| Ecological Impact | Competition | |
| In the upper Sacramento River watershed, the introduced crayfish O. virilis and Pacifastacus leniusculus (Signal Crayfish) were believed to be competing with the endangered native P. fortis (Shasta Crayfish) (Cohen and Carlton 1995). | ||