Reviews in Fish Biology and Fisheries

, Volume 12, Issue 2, pp 241–251

Freshwater fish at risk or extinct in México


  • Salvador Contreras-Balderas
    • Universidad Autónoma de Nuevo León
  • Patricia Almada-Villela
  • María de Lourdes Lozano-Vilano
    • Universidad Autónoma de Nuevo León
  • María García-Ramírez
    • Universidad Autónoma de Nuevo León

DOI: 10.1023/A:1025053001155

Cite this article as:
Contreras-Balderas, S., Almada-Villela, P., de Lourdes Lozano-Vilano, M. et al. Reviews in Fish Biology and Fisheries (2002) 12: 241. doi:10.1023/A:1025053001155


The Mexican freshwater fish that are at risk orextinct are listed by family, state,basin/region, and causes of risk. Of the 506known species, 168 are at some level of risk,and 25 are believed to be extinct. States withthe most reports are: Chihuahua (46); Coahuila(35); Nuevo León (20); Sonora (19); Durango(18); and Tamaulipas (15). With the exceptionof Sonora, these states are largely located inthe Río Bravo region, and are all arid orsemiarid. Most extinctions have occurred inNuevo León (8) and Coahuila (7). The maincauses of risk reported are: habitat reductionor alteration (86); water depletion (83);presence of exotics (76); small or decliningpopulation (73); and small habitat (57). Allof which result in very local endemism. Thesecauses of risk develop easily when thedistribution is small. The critical factor isaridity, which is associated withdesertization. Water conflicts were to beexpected, and the result is resource nonsustainability.

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© Kluwer Academic Publishers 2002