Descrizione originale come Gambusia alvarezi:
ZooBank:D24D9556-AA16-43B8-B061-48811AD3DDCC.
- Hubbs, Clark L & Victor G. Springer. 1957. "A revision of the Gambusia nobilis species group, with descriptions of three new species, and notes on their variation, ecology and evolution". Texas Journal of Science. 9(3):279-327 (ffm04561)
Conservazione: Gambusia alvarezi è valutata dalle organizzazioni internazionali di salvaguardia delle specie a rischio come (DD) Mancanza di dati (1996). Gambusia alvarezi has a very limited distribution in and around Ojo de Agua de San Gregorio, which is found in good shape up to our days (May 2023). The small area of the spring is kept isolated by a fence since the water is used for human consumption.