Establishing a captive broodstock for the endangered bonytail chub (Gila elegans)

P. W. Hedrick, T. E. Dowling, W. L. Minckley, C. A. Tibbets, B. D. Demarais, P. C. Marsh

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

It is crucial for endangered species to retain as much genetic variation as possible to enhance recovery. Bonytail chub (Gila elegans) is one the most imperiled freshwater fish species, persisting as a declining population of large and old individuals primarily in Lake Mohave on the lower Colorado River. Establishment of a new captive broodstock from the 1981 F1 progeny of at most 10 wild fish plus any newly captured wild fish is evaluated and reviewed. The effective number of founders contributing to the 1981 F1 progeny appears quite small, varying from approximately 3.5, based on F1 allozyme data and supported by mtDNA data, to approximately 8.5, based on the original production records. Using a sample of these progeny to initiate a new broodstock further reduces the effective number of founders. With even the most optimistic evaluation of the amount of genetic variation in F1 progeny, it is obvious that including wild fish in the broodstock is essential to increase the amount of genetic variation. The approach given here could be applied to retain genetic variation in other endangered species in a captive broodstock until they have stable natural populations of adequate size.

Original languageEnglish (US)
Pages (from-to)35-39
Number of pages5
JournalJournal of Heredity
Volume91
Issue number1
StatePublished - Jan 2000

Fingerprint

Cyprinidae
breeding stock
wild fish
Fishes
Endangered Species
genetic variation
endangered species
Colorado River
Population Dynamics
Lakes
Population Density
Fresh Water
Mitochondrial DNA
Rivers
freshwater fish
allozymes
Isoenzymes
mitochondrial DNA
lakes
Gila elegans

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Genetics
  • Genetics(clinical)

Cite this

Hedrick, P. W., Dowling, T. E., Minckley, W. L., Tibbets, C. A., Demarais, B. D., & Marsh, P. C. (2000). Establishing a captive broodstock for the endangered bonytail chub (Gila elegans). Journal of Heredity, 91(1), 35-39.

Establishing a captive broodstock for the endangered bonytail chub (Gila elegans). / Hedrick, P. W.; Dowling, T. E.; Minckley, W. L.; Tibbets, C. A.; Demarais, B. D.; Marsh, P. C.

In: Journal of Heredity, Vol. 91, No. 1, 01.2000, p. 35-39.

Research output: Contribution to journalArticle

Hedrick, PW, Dowling, TE, Minckley, WL, Tibbets, CA, Demarais, BD & Marsh, PC 2000, 'Establishing a captive broodstock for the endangered bonytail chub (Gila elegans)', Journal of Heredity, vol. 91, no. 1, pp. 35-39.
Hedrick PW, Dowling TE, Minckley WL, Tibbets CA, Demarais BD, Marsh PC. Establishing a captive broodstock for the endangered bonytail chub (Gila elegans). Journal of Heredity. 2000 Jan;91(1):35-39.
Hedrick, P. W. ; Dowling, T. E. ; Minckley, W. L. ; Tibbets, C. A. ; Demarais, B. D. ; Marsh, P. C. / Establishing a captive broodstock for the endangered bonytail chub (Gila elegans). In: Journal of Heredity. 2000 ; Vol. 91, No. 1. pp. 35-39.
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