Amistad gambusia
Extinct species of fish
The Amistad gambusia is an extinct species of small fish known only from a single locality, the large vegetated Goodenough Spring in Val Verde County, Texas. It apparently was driven to extinction in the wild when its habitat was submerged to a depth of about 70 feet by the construction of the Amistad Reservoir in 1968. The two captive populations, at the University of Texas System and the Dexter National Fish Hatchery in New Mexico, later failed through hybridization with the related mosquitofish and predation. The species has been classified as extinct by the United States Fish and Wildlife Service since 1987, and by the IUCN since 2013.
The public source identifies “Amistad gambusia” as extinct species of fish. This brief keeps that definition visible, then builds a research path around Amistad, gambusia and Extinct.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Amistad gambusia”, the useful work is to connect “extinct species of fish” to the records capable of establishing context and consequence.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Sep 21, 2026. The first chronological checks are 1968, 1987 and 2013.
Current terminology should not be projected backward without checking the classification used when the underlying evidence was created. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Three-step research path
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Questions for further research
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This entry incorporates text from “Amistad gambusia” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.