Invasion
Invasion Description
1st Estuarine Record: CA/Sacramento-San Joaquin Delta (2002, Moyle and Randall 1999; Light et al. 2002) 1st Watershed Record: Sacramento County/CA/Sacramento River (before 1997, Dill and Cordon 1997). These were Alabama Spotted Bass (M. p. henshalli), which were first tocked on California in 1974. Plantings of the Northern Spotted Bass (M. p. punctulatus started in 1933, but these fish only became established in upland tributaries, such as the Feather and Cosumnes Rivers (Dill and Cordone 1997).
Geographic Extent
CA/Sacramento-San Joaquin Delta (Cohen and Carlton 1995; Dill and Cordone 1997; Moyle and Randall 1999; Light et al. 2002); Walnut Grove/CA/North Fork Mokelumne River (Cavallo et al. 2012)
Vectors
| Level | Vector |
|---|---|
| Probable | Fisheries Intentional |
Regional Impacts
| Ecological Impact | Predation | |
| Removal of predators, dominated by Redeye Bass (Micropterus coosae) and Spotted Bass (M. punctulatus), by electrofishing, enhances the survival of tagged Chinook Salmon (Oncorhynchus tshawytscha) in migration through the North Fork of the North Fork Mokelumne River (Cavallo et al. 2013). | ||