Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Fishes
Native Transplant
Collection Info
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4 results for Gambusia affinis (Western Mosquitofish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
620941 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1964 18050004 San Francisco Bayestablished
620942 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1965 18050004 San Francisco Bayestablished
747716 CASan FranciscoJohn McLaren Park; pond located ca. 20m from southwest corner of intersection of Bacon and Oxford Streets.2000 18050004 San Francisco Bayestablished
1892074 CASanta Clara[No locality description provided]2025 18050004 San Francisco Bay 

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. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [12/4/2025].

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