Study of genetic variation in farmed populations of some species of the genus Oreochromis

Rognon Xavier, Guyomard R.. 1996. Study of genetic variation in farmed populations of some species of the genus Oreochromis. In : The Third International Symposium on Tilapia in Aquaculture. Pullin Roger S.V. (ed.), Lazard Jérôme (ed.), Legendre Marc (ed.), Amon Kothias Jean-Baptiste (ed.), Pauly Daniel (ed.). ICLARM, CRO, ORSTOM, CIRAD-EMVT. Manila : ICLARM, pp. 398-406. (ICLARM Conference Proceedings, 41) ISBN 971-8709-42-8 International Symposium on Tilapia in Aquaculture (ISTA). 3, Abidjan, Côte d'Ivoire, 11 November 1991/15 November 1991.

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Abstract : An electrophoretic study of enzyme polymorphism was conducted on five species of tilapia of the genus Oreochromis: O. niloticus, O. aureus, O. mossambicus, O. urolepis hornorum and O. macrochir. For O. niloticus, five farmed populations were analyzed, as well as two natural populations from the Volta and the Niger rivers. Eighteen enzyme systems, coded by 30 loci were studied. Heterozygosity and genetic distances between the different samples were calculated. The study of the genetic diversity of O. niloticus, shows the resemblances and dissimilarities that exist among these populations, as well as the maintenance of variability in farmed stocks. Analysis of the results obtained for one of the populations of O. aureus and O. mossambicus suggests a case of genetic introgression due to the continued use of these populations in interspecific hybridization. An analysis was conducted to estimate phylogenetic relationships between the different populations. (Résumé d'auteur)

Mots-clés Agrovoc : Tilapia, Oreochromis, Espèce, Variation génétique, Aquaculture

Classification Agris : L10 - Animal genetics and breeding

Auteurs et affiliations

  • Rognon Xavier, IDESSA (CIV)
  • Guyomard R., INRA (FRA)

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