Potential for genomic selection on feed efficiency in gilthead sea bream (Sparus aurata), based on individual feed conversion ratio, carcass and lipid traits

Type Article
Date 2022-06
Language English
Author(s) Besson Mathieu1, 2, 3, Rombout Nicky1, 2, Salou Germain2, Vergnet Alain2, Cariou Sophie4, Bruant Jean-Sébastien4, Izquierdo Marisol5, Bestin Anastasia3, Clota Frederic1, 2, Haffray Pierrick3, Allal Francois2, Vandeputte Marc1, 2
Affiliation(s) 1 : Université Paris-Saclay, INRAE, AgroParisTech, GABI, Jouy-en-Josas, France
2 : MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, INRAE, Palavas-les-Flots, France
3 : SYSAAF Section Aquacole, Campus de Beaulieu, Rennes, France
4 : Fermes Marine Du Soleil, La Brée Les Bains, France
5 : Grupo de Investigación en Acuicultura, Universidad de Las Palmas de Gran Canaria, Las Palmas, Spain
Source Aquaculture Reports (2352-5134) (Elsevier BV), 2022-06 , Vol. 24 , P. 101132 (13p.)
DOI 10.1016/j.aqrep.2022.101132
Keyword(s) Fine phenotyping, Selective breeding, Aquaculture, Genomic, Restricted feeding, Individual feed efficiency

Genetic improvement of feed efficiency is key to improve the economic and environmental sustainability of fish farming. However, it requires individual phenotypes of feed efficiency, which are difficult if not impossible to obtain when fish are reared in tanks or cages. Here, we applied and validated on gilthead sea bream a method to evaluate individual feed efficiency based on individual rearing of fish in aquariums under restricted feeding. We collected individual phenotypes of feed efficiency in aquariums on 538 sea bream (average weight = 54.50 g). Based on these individual phenotypes, fish (average weight = 174.6 g) were reared in groups of divergent phenotypes (high or low feed efficiency), validating that individual feed efficiency had an impact on group feed efficiency at a later stage. All 538 fish, their parents as well as 794 sibs reared in cages in a production environment, were genotyped on a 57k SNP array to estimate genomic heritability and correlations between traits. We showed that feed efficiency was heritable but did not find significant associated QTLs. We also showed that feed efficiency was negatively genetically correlated to viscera yield, indicating that the most efficient fish had less viscera than the least efficient ones. Altogether, these results support that measuring individual feed efficiency in aquariums under restricted feeding may be used as a reliable phenotyping method to genetically improve feed efficiency, despite the bias intrinsically linked to individual rearing.

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Besson Mathieu, Rombout Nicky, Salou Germain, Vergnet Alain, Cariou Sophie, Bruant Jean-Sébastien, Izquierdo Marisol, Bestin Anastasia, Clota Frederic, Haffray Pierrick, Allal Francois, Vandeputte Marc (2022). Potential for genomic selection on feed efficiency in gilthead sea bream (Sparus aurata), based on individual feed conversion ratio, carcass and lipid traits. Aquaculture Reports, 24, 101132 (13p.). Publisher's official version : https://doi.org/10.1016/j.aqrep.2022.101132 , Open Access version : https://archimer.ifremer.fr/doc/00772/88359/