Impact of aquaculture on the genetic structure of mediterranean populations of Dicentrarchus labrax

TitleImpact of aquaculture on the genetic structure of mediterranean populations of Dicentrarchus labrax
Publication TypeJournal Article
Year of Publication2005
AuthorsBahri-Sfar, L, Lemaire C, Chatain B, Divanach P, Hassine OKB, Bonhomme F
JournalImpact de l'élevage sur la structure génétique des populations méditerranéennes de Dicentrarchus labraxAquatic Living Resources
Volume18
Issue1
Pages71 - 76
KeywordsDicentrarchus labrax, Escapees, Farmed populations, Molecular marker
Abstract

A phylogeographic analysis based on 6 polymorphic microsatellites was performed on 15 sea bass samples, five from Western Mediterranean, seven from Eastern Mediterranean and three coming from French aquaculture stocks. Among the eastern samples, three did not cluster according to their geographic origin but rather with the occidental group. Furthermore, a somewhat lower allelic diversity was observed within these particular samples, indicating that they originated from a limited number of progenitors of foreign origin. Among the aquaculture stocks, only one revealed a significant reduction of genetic variability, indicating that these stocks are largely outbred and open to wild fishes. The fact that the use of occidental fingerlings to seed broodstocks in the eastern basin facilities dates back to the early 80s at the latest poses the question of the biological mechanisms explaining the maintainance of fish from occidental origin within an oriental context for two or three generations. © EDP Sciences, IFREMER, IRD 2005.

URLhttp://www.scopus.com/inward/record.url?eid=2-s2.0-16244362398&partnerID=40&md5=29bc29a3a5b9351b894f97ccca10f1c3

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