Gambusia amistadensis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Gambusia amistadensis
Species Authority: Peden, 1973
Common Name(s):
English Amistad Gambusia

Assessment Information [top]

Red List Category & Criteria: Extinct ver 3.1
Year Published: 2013
Date Assessed: 2012-02-03
Assessor(s): NatureServe
Reviewer(s): Smith, K. & Darwall, W.R.T.
Facilitator/Compiler(s): Hammerson, G.A. & Ormes, M.
This species is listed as Extinct because the only population was exterminated by a reservoir, and captive populations were genetically contaminated by western mosquitofish.
1996 Extinct

Geographic Range [top]

Range Description: Historical range included Goodenough Spring and adjacent spring run, which flowed 1.3 km to Rio Grande, Val Verde County, Texas. Captive stocks that formerly existed at the University of Texas and Dexter Fish Lab are now extinct (contaminated with mosquitofish).
Regionally extinct:
United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: No occurrences remain.

Extinct (Hubbs and Jensen 1984, USFWS 1987, Miller et al. 1989, Robins et al. 1991). See Minckley et al. (1991) for a detailed account of the history of this species and Goodenough Spring.

Habitat and Ecology [top]

Habitat and Ecology: This species inhabited a large vegetated spring and its effluent (Minckley et al. 1991, Page and Burr 2011).
Systems: Freshwater

Threats [top]

Major Threat(s): Its habitat was inundated by the Amistad Reservoir, extirpating the species in its natural range.

Conservation Actions [top]

Conservation Actions: This species is extinct and does not require protection or management, monitoring, or research action.

Citation: NatureServe 2013. Gambusia amistadensis. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 04 September 2015.
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