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Multi-site evaluation of the rearing performances of 5 wild populations of European sea bass (Dicentrarchus labrax)

Abstract : Sea bass is a major species in Mediterranean aquaculture, but has a distribution area ranging from North Atlantic to South Mediterranean, with a population structure previously revealed by population genetics. To test the farming performances of wild sea bass populations, we produced a partial diallel cross mating scheme, using sires originating from North Atlantic (NAT), South Atlantic (SAT), West Mediterranean (WEM), North-East Mediterranean (NEM) and South-East Mediterranean (SEM). Fifteen sires per origin were mated in a full-factorial design using artificial fertilization with 9 NAT dams and 17 WEM dams, producing 10 population crosses and 1950 potential full-sib families. All fish were reared together, then tagged at an average weight of 20 g and distributed to four different sites (1800 fish per site). They were grown to an objective of 200 g mean weight, where 737 to 775 fish were slaughtered in each site, and their parentage was recovered using 6 to 7 microsatellite loci, resulting in 98.9% unique assignments. All populations had similar growth rates until tagging size (20 g), but differences appeared later on. No heterosis appeared for growth rate, and genotype by environment interaction (G × E) at the population level was limited, with a significant re-ranking only in one rearing site, while strong G × E for growth rate was observed within populations. Populations were different in shape, muscular fat content, and carcass yield, but not in fillet yield. In general, heterosis was absent and G × E was very limited between populations. No "ideal" population combining all favorable traits was identified. Differences between extreme populations ranged between 3 and 49% of the mean, depending on the traits. Interestingly, in almost all cases, these differences were within the reach of one generation of intense (5%) phenotypic selection.
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https://hal.archives-ouvertes.fr/hal-01004791
Contributor : Archive Ouverte Prodinra <>
Submitted on : Wednesday, June 11, 2014 - 4:19:35 PM
Last modification on : Wednesday, June 16, 2021 - 3:51:58 AM

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Marc Vandeputte, Romain Garouste, Mathilde Dupont-Nivet, Pierrick Haffray, Alain Vergnet, et al.. Multi-site evaluation of the rearing performances of 5 wild populations of European sea bass (Dicentrarchus labrax). Aquaculture, Elsevier, 2014, 424-425, pp.239-248. ⟨10.1016/j.aquaculture.2014.01.005⟩. ⟨hal-01004791⟩

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