Invasion
Invasion Description
1st watershed record: CA/Pillsbury Reservoir, Eel River (Brown and Moyle 1997)
Geographic Extent
CA/lower mainstem Eel River (1989, Brown and Moyle 1997)
Vectors
| Level | Vector |
|---|---|
| Alternate | Fisheries Accidental (not Oyster) |
| Alternate | Discarded Bait |
Regional Impacts
| Ecological Impact | Predation | |
| Ptychocheilus grandis are opportunistic predators on salmonids, cyprinids, and freshwater sculpins (Cottus asper, C. aleuticus) (Brown and Moyle 1997). In comparisons of streams with and without P. grandis, densities of sculpins were 21X higher in streams without pikeminnow (White and Harvey 2001). | ||
| Economic Impact | Fisheries | |
| Predation by Sacramento Squawfishes is a concern for management of anadromous salmon or trout, and have prompted studies of the biology and feeding of this fish (Brown and Moyle 1997).. Experimental removal efforts have been made by the California Department of Fish and Wildlife, and private groups have organized fishing derbies, but large-scale removal efforts have been considered futile (Wilson 2010). | ||