Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Fishes
Native Transplant
Collection Info
Point Map
Species Profile
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24 results for Gambusia affinis (Western Mosquitofish)
Download Data

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
27939 AZ state non-specific1961 15000000 Lower Colorado Regionestablished
29574 CA state non-specific1961 18000000 California Regionestablished
747938 CAMontereyPajaro River, 10 mi. west of Hwy 1011961 18060002 Pajaroestablished
33554 IL northern Illinois1961 07120007 Lower Foxestablished
34083 IN state non-specific1961 05000000 Ohio Regionestablished
34291 KS state non-specific1961  established
34980 MA state non-specific1961 01000000 New England Regionestablished
35538 MI state non-specific1961 04000000 Great Lakes Regionestablished
35851 MN state non-specific1961  collected
35855 MNAnoka 1961 07000000 Upper Mississippi Regionestablished
35858 MNHennepinHennepin County, ponds1961 07010200 Upper Mississippi-Crow-Rumestablished
35862 MNRamseyRamsey County, ponds1961 07010206 Twin Citiesestablished
35961 MNScottScott County, ponds1961 07020012 Lower Minnesotaestablished
35867 MNWashingtonWashington County, ponds1961 07000000 Upper Mississippi Regionestablished
36104 MO state non-specific1961  established
163126 MTGraniteBearmouth, Granite County, high-altitude, thermal spring fed pond in the Columbia River drainage1961 17010202 Flint-Rockestablished
38060 NJ state non-specific1961 02000000 Mid-Atlantic Regionestablished
38071 NM state non-specific1961  established
39322 NV state non-specific1961  established
39692 NY state non-specific1961 Unknown or N/Aestablished
40107 OH state non-specific1961  established
44683 UT state non-specific1961  established
46095 WA state non-specific1961 17000000 Pacific Northwest Regionestablished
46375 WI state non-specific1961  failed

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. [2026]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [1/22/2026].

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.