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| NAS - Nonindigenous Aquatic Species |
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Common Name: Pecos gambusia
Taxonomy: available through 
Identification: Sublette et al. (1990); Hubbs et al. (1991); Page and Burr (1991).
Size: 4.8 cm.
Native Range:
Endemic to springs and sinkholes in the Pecos River system, New Mexico and Texas (Hubbs et al. 1991; Page and Burr 1991).
Nonindigenous Occurrences: The Pecos gambusia was introduced into New Mexico in Lake St. Francis and in sinkholes at Bitter Lake National Wildlife Refuge, Chaves County, that did not contain native populations of this species (other sinkholes where it was introduced contained native populations); Ink Pot, Salt Creek Wilderness Area, Chaves County; Geyser Spring; and artificial ponds at the Living Desert State Park near Carlsbad, Eddy County (U.S. Fish and Wildlife Service 1982b; Sublette et al. 1990).
Means of Introduction: This endangered species was intentionally stocked to create additional populations. Ink Pot and one sinkhole at Bitter Lake were stocked in 1973. The source of the Living Desert State Park population stocked in 1975 is apparently Blue Spring, near Black River Village, Eddy County (U.S. Fish and Wildlife Service 1982b). Pecos gambusia were transplanted from waters near the north end of the Bitter Lake National Wildlife Refuge into 19 new localities within the same refuge and within the Salt Creek Wilderness Areas in 1972 and 1973. Other sinkholes at Bitter Lake were stocked in July and August 1981 (U.S. Fish and Wildlife Service 1982b). As part of recovery efforts, health officials in New Mexico investigated the use of G. nobilis in stock ponds within the Pecos River drainage to control mosquitoes, but the project was stopped when stocked fish failed to survive (Johnson and Hubbs 1989).
Status: Extirpated at Lake St. Francis and Geyser Spring, Bitter Lake National Wildlife Refuge, probably due to predation by introduced green sunfish Lepomis cyanellus and largemouth bass Micropterus salmoides (U.S. Fish and Wildlife Service 1982b). New populations became established in two sinkholes and at Ink Pot as result of 1972-1973 stockings. The other 16 transplants made at that time failed. Status of 1981 populations not known (U.S. Fish and Wildlife Service 1982b).
Impact of Introduction: Unknown.
Remarks: The Pecos gambusia was listed as a federally endangered species in 1970 (U.S. Fish and Wildlife Service 1982b, 1993a). It has been affected negatively by hybridization, predation, and competition with two introduced species: the western mosquitofish G. affinis and the largespring gambusia G. geiseri (U.S. Fish and Wildlife Service 1982b; Hendrickson and Brooks 1991; Minckley et al. 1991). Hendrickson and Brooks (1991) indicated that G. nobilis had been stocked into 33 different sites for conservation purposes, but they did not distinguish between historic native habitats and sites outside its former native range.
Hendrickson, D. A., and J. E. Brooks. 1991. Transplanting short-lived fishes in North American deserts: review, assessment, and recommendations. Pages 283-298 in W. L. Minckley and J. E. Deacon, editors. Battle against extinction: native fish management in the American West. University of Arizona Press, Tucson, AZ.
Hubbs, C., R. J. Edwards, and G. P. Garrett. 1991. An annotated checklist of freshwater fishes of Texas, with key to identification of species. Texas Journal of Science, Supplement 43(4):1-56.
Johnson, J. E., and C. Hubbs. 1989. Status and conservation of poeciliid fishes. Pages 301-331 in G. K. Meffe, and F. F. Snelson, editors. Ecology and evolution of livebearing fishes (Poeciliidae). Prentice Hall, Englewood Cliffs, NJ.
Page, L. M., and B. M. Burr. 1991. A field guide to freshwater fishes of North America north of Mexico. The Peterson Field Guide Series, volume 42. Houghton Mifflin Company, Boston, MA.
Sublette, J. E., M. D. Hatch, and M. Sublette. 1990. The fishes of New Mexico. New Mexico Department of Game and Fish, University of New Mexico Press, Albuquerque, NM. 393 pp.
U.S. Fish and Wildlife Service. 1982b. Pecos gambusia (Gambusia nobilis) recovery plan. U.S. Fish and Wildlife Service, Albuquerque, NM. iii + 41 pp.
Other Resources:
FishBase Fact Sheet
Author: Leo Nico and Pam Fuller
Revision Date: 5/17/2000 Citation for this information:
Leo Nico and Pam Fuller. 2009. Gambusia nobilis. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=851> Revision Date: 5/17/2000
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