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| NAS - Nonindigenous Aquatic Species |
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Common Name: California roach
Synonyms and Other Names: Lavinia symmetricus
Taxonomy: available through 
Identification: Moyle (1976a); Page and Burr (1991). Placed in the genus Lavinia by some researchers.
Size: 11 cm.
Native Range: Sacramento--San Joaquin and Pajaro-Salinas River drainages, California (Page and Burr 1991).
Nonindigenous Occurrences: This species is known from the Cuyama River, San Luis Obispo and Santa Barbara counties, California (Moyle 1976a). It may also have been introduced into the Eel River of California (Fite 1973, cited by Moyle 1976a). In Oregon, it is known from the Warner Valley (Great Basin) (Sigler and Sigler 1987) and, probably in reference to the same record or site, from the Summer Lake Basin (Bond 1994).
Means of Introduction: Populations in the Cuyama River, California are presumably the result of bait-bucket introduction (Moyle 1976a). Unknown in Oregon.
Status: Established in at least one river system in California outside its native range (Moyle 1976a). Reported from Oregon (Sigler and Sigler 1987).
Impact of Introduction: Unknown.
Remarks: Sigler and Sigler (1987), apparently citing Moyle (1976a), stated that California roach may have been introduced into the Cuyama River of California, although earlier natural stream capture cannot be ruled out. We found no mention of possible stream capture in that earlier reference. The California roach can survive where most other fishes cannot because of their small size and tolerance of low oxygen levels and high temperatures. Nevertheless, it has declined or disappeared from parts of its native range (the upper San Joaquin, Fresno, and Chowchilla river systems in central California) as a result of a combination of factors, one being predation by the introduced green sunfish Lepomis cyanellus (Moyle 1976b).
Other Resources:
FishBase Fact Sheet
Author: Leo Nico
Revision Date: 6/27/2000 Citation for this information:
Leo Nico. 2009. Hesperoleucus symmetricus. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=543> Revision Date: 6/27/2000
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