Study of genetic variation in farmed populations of some species of the genus Oreochromis
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.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
ICLARM
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| Subjects: | L10 - Génétique et amélioration des animaux, Tilapia, Oreochromis, espèce, variation génétique, aquaculture, http://aims.fao.org/aos/agrovoc/c_32720, http://aims.fao.org/aos/agrovoc/c_26596, http://aims.fao.org/aos/agrovoc/c_7280, http://aims.fao.org/aos/agrovoc/c_15975, http://aims.fao.org/aos/agrovoc/c_550, |
| Online Access: | http://agritrop.cirad.fr/512450/ |
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