Multi-site evaluation of the rearing performances of 5 wild populations of European sea bass (Dicentrarchus labrax)
|Author(s)||Vandeputte Marc1, 2, Garouste Romain1, Dupont-Nivet Mathilde2, Haffray Pierrick3, Vergnet Alain1, Chavanne Herve4, Laureau Stanislas5, Ron Tetsuzan Benny6, Pagelson Glen7, Mazorra Carlos8, Ricoux Remi9, Marques Pedro10, Gameiro Marta10, Chatain Beatrice1|
|Affiliation(s)||1 : IFREMER, INTREPID UMR110, F-34250 Palavas Les Flots, France.
2 : INRA, GABI UMR1313, F-78350 Jouy En Josas, France.
3 : Sysaaf, Stn INRA LPGP, F-35042 Rennes, France.
4 : Ist Sperimentale Lazzaro Spallanzani, I-26027 Rivolta Dadda, CR, Italy.
5 : Ecloserie Marine Gravelines, F-59820 Gravelines, France.
6 : Israel Oceanog & Limnol Res, Natl Ctr Mariculture, IL-88112 Elat, Israel.
7 : Ardag Ltd, IL-88116 Elat, Israel.
8 : Tinamenor SL, Pesues 39548, Cantabria, Spain.
9 : Poissons Soleil, F-34540 Balaruc Les Bains, France.
10 : Viveiro Vila Nova, P-7645073 Vila Nova De Milfontes, Portugal.
|Source||Aquaculture (0044-8486) (Elsevier Science Bv), 2014-03 , Vol. 424 , P. 239-248|
|WOS© Times Cited||27|
|Keyword(s)||European sea bass, Dicentrarchus labrax, Selective breeding, Growth, Processing yields, Genotype by environment interaction|
|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 (GxE) at the population level was limited, with a significant re-ranking only in one rearing site, while strong GxE for growth rate was observed within populations. Populations were different in shape, muscular fat content, carcass yield, but not in fillet yield. In general, heterosis was absent and GxE was very limited between populations. No “ideal” population combining all favourable 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.|