IUCN lists the Monterrey platyfish, formerly widespread in Mexico, as Critically Endangered, upgraded from Endangered in 1996. The fish's population, numbering fewer than 250 individuals, is falling rapidly and is confined to a very small area, occurring only in fragmented pockets of habitat populated by few individuals. It is additionally suffering from environmental degradation.
Sexual dimorphism is moderate, the male Monterrey platyfish growing to a maximum overall length of 4.0 cm (1.6 in) and the female 6.0 cm (2.4 in).
- Contreras-Balderas & Almada-Villela (1996). "Xiphophorus couchianus". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 11 May 2006. Listed as Critically Endangered (CR A1ce+2ce, B1+2abc, C2a v2.3)
- Froese, Rainer and Pauly, Daniel, eds. (2004). "Xiphophorus couchianus" in FishBase. October 2004 version.
- "Xiphophorus couchianus". Integrated Taxonomic Information System. Retrieved 9 December 2004.
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