Gambusia affinis
Gambusia affinis
(Western Mosquitofish)
Native Transplant

54 results for Gambusia affinis (Western Mosquitofish)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
28975 CA Pajaro drainage1976 18060002 Pajaroestablished
28972 CA Sacramento-San Joaquin drainage, coast of1976 18060015 Monterey Bayestablished
747938 CAMontereyPajaro River, 10 mi. west of Hwy 1011961 18060002 Pajaroestablished
747969 CAMontereySalinas River about 6 mi. S of city limits of San Ardo.1965 18060005 Salinasestablished
747864 CAMontereySalinas River, S shore about 2 km upstream from ocean1988 18060005 Salinasestablished
28584 CAMonterey/Santa ClaraPajaro River1972 18060002 Pajaroestablished
748041 CASan Luis ObispoAlamo Ck; 3.4 km from juncture with Cuyama River1975 18060007 Cuyamaestablished
748040 CASan Luis ObispoAlamo Creek in 200 m downstream of main Highway 166, 2.0 km from juncture with Cuyama River1975 18060007 Cuyamaestablished
747739 CASan Luis ObispoAvila Creek at San Luis Bay Drive Bridge.1974 18060006 Central Coastalestablished
748028 CASan Luis ObispoEast fork of Pismo creek under highway 2271975 18060006 Central Coastalestablished
748024 CASan Luis ObispoHuasna River, 12.65 km from juncture with Cuyama River1975 18060007 Cuyamaestablished
748023 CASan Luis ObispoHuasna River, 14.9 km from juncture with Cuyama River1975 18060007 Cuyamaestablished
748039 CASan Luis ObispoHuasna RU at Highway 166, 1.1 km from juncture with Cuyama River1975 18060007 Cuyamaestablished
748205 CASan Luis Obispolarge pond E of mouth of Santa Maria River1977 18060008 Santa Mariaestablished
747806 CASan Luis Obispomouth of Arroyo Grande creek, 4 km south of Pismo beach1981 18060006 Central Coastalestablished
747740 CASan Luis ObispoOso Flaco Creek, 0.30 km from mouth of Oso Flaco Creek.1974 18060006 Central Coastalestablished
748202 CASan Luis Obispooutlet of Oso Flaco Lake, 11-12 km SSW of Arroyo Grande1977 18060006 Central Coastalestablished
748025 CASan Luis ObispoSan Luis Obispo Cr., 10.05 km from mouth.1975 18060006 Central Coastalestablished
748029 CASan Luis ObispoSan Luis Obispo Cr., against upstream side of wier, 2.1 km from mouth.1975 18060006 Central Coastalestablished
748027 CASan Luis ObispoSan Luis Obispo Creek o.3 to 2.0 km from mouth1975 18060006 Central Coastalestablished
747807 CASan Luis ObispoSan Luis Obispo creek, 1.5 km up from mouth at sheet metal dam1981 18060006 Central Coastalestablished
748201 CASan Luis ObispoSan Luis Obispo Creek, 3.5 km upstream of mouth1977 18060006 Central Coastalestablished
748026 CASan Luis ObispoTributary to San Luis Obispo Cr., within 100 m of contrehu. Tributary called Pretumo Cr., 12 km from mouth of San Luis Obispo Cr.1975 18060006 Central Coastalestablished
747738 CASanta BarbaraGoleta Slough1968 18060013 Santa Barbara Coastalestablished
748233 CASanta BarbaraGoleta Slough (trib.) along E edge of Santa Barbara airport, along Fairview Blvd.1974 18060013 Santa Barbara Coastalestablished

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. [2023]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [3/27/2023].

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