Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Fishes
Native Transplant
Collection Info
Point Map
Species Profile
Animated Map

10 results for Gambusia affinis (Western Mosquitofish)
Download Data

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
29453 CA San Francisco Bay drainage (level 6)1980 18050000 San Francisco Bayestablished
620941 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1964 18050004 San Francisco Bayestablished
620942 CAAlamedaSan Francisco Bay - Oakland, Lake Merritt1965 18050004 San Francisco Bayestablished
1675032 CASan Francisco[No locality description provided]2020 18050006 San Francisco Coastal South 
747716 CASan FranciscoJohn McLaren Park; pond located ca. 20m from southwest corner of intersection of Bacon and Oxford Streets.2000 18050004 San Francisco Bayestablished
158301 CASan FranciscoPresidio of San Francisco Park1999 18050002 San Pablo Bayestablished
620943 CASan FranciscoSan Francisco Bay1989 18050002 San Pablo Bayestablished
747715 CASanta ClaraCoyote Cr. opposite Milpitas, elev. ca. 20 ft.1941 18050003 Coyoteestablished
747891 CASolanoGreen Valley Creek1979 18050001 Suisun Bayestablished
163518 CASolanoSuisun Marsh [wetlands between Grizzly Bay and Fairfield]2002 18050001 Suisun Bayestablished

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.

Disclaimer:

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 [1/13/2025].

Contact us if you are using data from this site for a publication to make sure the data are being used appropriately and for potential co-authorship if warranted.

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