Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Fishes
Native Transplant
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6 results for Gambusia affinis (Western Mosquitofish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1893042 CAHumboldt[No locality description provided]2025 18010102 Mad-Redwood 
620944 CAHumboldtEureka Slough, Upper2000 18010102 Mad-Redwoodestablished
272665 CAHumboldtEureka Slough, upper, Arcata Bay.2001 18010102 Mad-Redwoodestablished
1464625 CAHumboldtGravel pits near Mad River2015 18010102 Mad-Redwoodestablished
271923 CAHumboldtMad River backwater area downstream of Hwy 1012010 18010102 Mad-Redwoodestablished
272667 CAHumboldtMad River, backwater area on the north side 200 meters west of Highway 101 bridge2010 18010102 Mad-Redwoodestablished

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.

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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. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [2/22/2026].

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