Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Native Transplant

288 results for Gambusia affinis (Western Mosquitofish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
28980 CA Colorado drainage1976 15030100 Lower Coloradoestablished
28977 CA Death Valley drainage1976 18090203 Death Valley-Lower Amargosaestablished
28976 CA Lahontan drainage1976 18070204 Newport Bayestablished
29362 CA lower Carson River near Los Angeles1934 18070100 Ventura-San Gabriel Coastalestablished
29363 CA lower Carson River near Los Angeles1934 18070100 Ventura-San Gabriel Coastalestablished
28975 CA Pajaro drainage1976 18060002 Pajaroestablished
29453 CA San Francisco Bay drainage (level 6)1980 18050000 San Francisco Bayestablished
1458928 CA San Joaquin (HUC6) non-specific1970 18040000 San Joaquinestablished
1458929 CA San Joaquin (HUC6) non-specific1986 18040000 San Joaquinestablished
282196 CA Santa Clara drainage1975 18070102 Santa Claraestablished
29635 CA South Fork Kern River1997 18030002 South Fork Kernestablished
29496 CA upper portions of the Santa Clara River system1977 18070102 Santa Claraestablished
28971 CA Central Valley drainage1976 18020125 Upper Yubaestablished
28972 CA Sacramento-San Joaquin drainage, coast of1976 18060015 Monterey Bayestablished
28978 CA South California drainage1976 18070102 Santa Claraestablished
28981 CA state non-specific1922 18000000 California Regionestablished
29369 CA state non-specific1922 18000000 California Regionestablished
28626 CA state non-specific1922 18000000 California Regionestablished
29574 CA state non-specific1961 18000000 California Regionestablished
28628 CA state non-specific1973 18000000 California Regionestablished
620941 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1964 18050004 San Francisco Bayestablished
620942 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1965 18050004 San Francisco Bayestablished
273914 CAButtenon-specific 'hatchery' location in Oroville1923 18020159 Honcut Headwaters-Lower Featherstocked
748002 CAContra CostaKellogg Creek, near intersection of Camino Diablo Rd.and Vasco Rd.1973 18040003 San Joaquin Deltaestablished
748011 CAFresnoFresno Slough, 2.4 miles below Hwy 180 on Mendota Wildlife Refuge1973 18030009 Upper Dryestablished

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are 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 data.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [7/16/2024].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.