Invasion
Invasion Description
1st Record: Los Angeles/CA/Coyote Creek (1973, Courtenay et al. 1984). Orechromis spp. in California coastal waters are hybrds of O. mossambicus and O. hormorum.
Geographic Extent
Los Angeles/CA/Coyote Creek (1973, Knaggs 1977; Courtenay et al. 1984); Orange County/CA/Seal Beach (1973, Courtenay et al. 1984); Orange County/CA/Santa Ana River (1974 Courtenay et al. 1984); Orange County/CA/San Gabriel River (1973, Knaggs, 1977; Courtenay et al. 1984; still established according to fishing websites); Long Beach/CA/Cerritos Lagoon (1977, (1973, Courtenay et al. 1984); Long Beach/CA/Colorado Lagoon, Alamitos Bay (1976; Knaggs 1977; Courtenay et al. 1984; Dill and Cordone 1997; Valle et al. 1998); 'warmwater beach', near power plant, Carlsbad State Beach/CA/Pacific Ocean (Costa-Pierce 2003); CA/Upper Newport Bay (Horn 1988, cited by Costa-Pierce 2003, unknown establishment),
Vectors
| Level | Vector |
|---|---|
| Alternate | Biocontrol |
Regional Impacts
| Ecological Impact | Hybridization | |
| Mozambique Tilapia (Oreochromis mossambicus) (probably already hybridized with O. urolepis), stocked in southern California ponds, canals, and lagoons, together with Wami tilapia (O. urolepis) for weed and insect control (Legner and Pelsue 1977; Dill and Cordone 1997; Costa-Pierce 2003). Purebred O. urolepis are no longer present in southern Califonia Costa-Pierce 2003). 'California Mozambique Tilapia' are hybrids (Moyle 2992; California Fish Website 2018). | ||