Common name: California Roach
Synonyms and Other Names: Lavinia symmetricus
available through www.itis.gov
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).
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Hesperoleucus symmetricus are found here.
Table last updated 12/6/2022
† Populations may not be currently present.
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: Power (1992) demonstrated that introduced roach in the Eel River, California, had cascading effects on the abundance of benthic invertebrates and algae (Parker et al., 1999).
References: (click for full references)
Parker, I.M., D. Simberloff, W.M. Lonsdale, K. Goodell, M. Wonham, P.M. Kareiva, M.H. Williamson, B. Von Holle, P.B. Moyle, J.E. Byers, and L. Goldwasser. 1999. Impact: toward a framwork for understanding the ecological effects of invaders. Biological Invasions 1:3-19.
Power, M.E. 1992. Habitat heterogeneity and the functional significance of fish in river food webs. Ecology 73: 1675–1688.
Leo Nico, and Pam Fuller
Revision Date: 12/27/2012
Peer Review Date: 12/27/2012
Leo Nico, and Pam Fuller, 2022, Hesperoleucus symmetricus (Baird and Girard, 1854): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=543, Revision Date: 12/27/2012, Peer Review Date: 12/27/2012, Access Date: 12/7/2022
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.