Gambusia amistadensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cyprinodontiformes Poeciliidae

Scientific Name: Gambusia amistadensis 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.
Previously published Red List assessments:

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).
Countries occurrence:
Regionally extinct:
United States
Additional data:
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.
Additional data:

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).
Movement patterns:Not a Migrant

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.

Classifications [top]

5. Wetlands (inland) -> 5.9. Wetlands (inland) - Freshwater Springs and Oases
suitability:Suitable  major importance:Yes

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
7. Natural system modifications -> 7.2. Dams & water management/use -> 7.2.10. Large dams
♦ timing:Past, Unlikely to Return ♦ scope:Whole (>90%) ♦ severity:Very Rapid Declines ⇒ Impact score:Past Impact 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

Bibliography [top]

Hubbs, C. and Jensen, B.L. 1984. Extinction of Gambusia amistadensis, an endangered fish. Copeia 1984: 529-530.

IUCN. 2013. IUCN Red List of Threatened Species (ver. 2013.1). Available at: (Accessed: 12 June 2013).

Lee, D.S., Gilbert, C.R., Hocutt, C.H., Jenkins, R.E., McAllister, D.E. and Stauffer, J.R., Jr. 1980. Atlas of North American freshwater fishes. North Carolina State Museum of Natural History, Raleigh, North Carolina.

Meffe, G.K. and Snelson, F.F., Jr. (eds). 1989. Ecology and evolution of livebearing fishes (Poeciliidae). pp. 453. Prentice Hall, Englewood Cliffs, New Jersey.

Miller, R.R., Williams, J.D. and Williams, J.E. 1989. Extinctions of North American fishes during the past century. Fisheries 14(6): 22-38.

Minckley, W.L., Meffe, G.K. and Soltz, D.L. 1991. Conservation and management of short-lived fishes: the cyprinodontoids. In: W.L. Minckley and J.E. Deacon (eds), Battle Against Extinction: Native Fish Management in the American West, pp. 247-282. University of Arizona Press, Tucson, Arizona.

Nelson, J.S., Crossman, E.J., Espinosa-Perez, H., Findley, L.T., Gilbert, C.R., Lea, R.N. and Williams, J.D. 2004. Common and scientific names of fishes from the United States, Canada, and Mexico. American Fisheries Society, Bethesda, Maryland.

Page, L.M. and Burr, B.M. 1991. A field guide to freshwater fishes: North America north of Mexico. Houghton Mifflin Company, Boston, Massachusetts.

Page, L.M. and Burr, B.M. 2011. Peterson field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Harcourt, Boston, Massachusetts.

Rauchenberger, M. 1989. Systematics and biogeography of the genus Gambusia (Cyprinodontiformes: Poecilidae). American Museum Novitates 2951: 1-74.

Robins, C.R., Bailey, R.M., Bond, C.E., Brooker, J.R., Lachner, E.A., Lea, R.N. and Scott, W.B. 1991. Common and scientific names of fishes from the United States and Canada. American Fisheries Society.

U.S. Fish and Wildlife Service (USFWS). 1987. Removal of Gambusia amistadensis [sic], the Amistad gambusia, from the list of endangered and threatened wildlife. Federal Register 52: 46083-46087.

Citation: NatureServe. 2013. Gambusia amistadensis. The IUCN Red List of Threatened Species 2013: e.T8888A18229604. . Downloaded on 23 July 2018.
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