Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Native Transplant

14 results for Gambusia affinis (Western Mosquitofish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1678015 CALos Angeles[No locality description provided]2018 18070105 Los Angeles 
747939 CALos Angeles300m upstream of Sepulveda dam on the Los Angeles River1969 18070105 Los Angelesestablished
747940 CALos Angeles300m upstream of Sepulveda dam on the Los Angeles River1969 18070105 Los Angelesestablished
747996 CALos AngelesArroyo Seco1933 18070105 Los Angelesestablished
748276 CALos AngelesArroyo Seco, 100 yds above and below Colorado blvd (210 Fwy) Pasadena1972 18070105 Los Angelesestablished
748110 CALos AngelesBig Tujunga Creek 3 miles south of upper Trail Canyon Road.1972 18070105 Los Angelesestablished
748020 CALos AngelesGriffith Park1934 18070105 Los Angelesestablished
747997 CALos AngelesLos Angeles River1931 18070105 Los Angelesestablished
259211 CALos AngelesLos Angeles River2007 18070105 Los Angelesestablished
748111 CALos AngelesLos Angeles River at Griffin Park.1972 18070105 Los Angelesestablished
748149 CALos AngelesPasadena, Arroyo Seco and small impounded trib. entering from E, 0.25 miles north Pasadena Freeway1972 18070105 Los Angelesestablished
747808 CALos AngelesPasadena, Arroyo Seco at crossing of Colorado blvd. bridge1972 18070105 Los Angelesestablished
748148 CALos AngelesRio Hondo wash between San Gabriel Blvd Bridge and Whittier Narrows Dam1972 18070105 Los Angelesestablished
748122 CALos Angelesupstream from Balboa Ave. Reseda, L.A. River1975 18070105 Los Angelesestablished

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 [5/24/2024].

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