Original description as Gambusia alvarezi:
- 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)
Conservation: Gambusia alvarezi is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (DD) data deficient (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.