An investigation of links between metabolic rate and feed efficiency in European sea bass Dicentrarchus labrax

Rodde Charles, De Verdal Hugues, Vandeputte Marc, Allal François, Nati Julie, Besson Mathieu, Blasco Felipe R., Benzie John A.H., McKenzie David J.. 2021. An investigation of links between metabolic rate and feed efficiency in European sea bass Dicentrarchus labrax. Journal of Animal Science, 99 (6), 9 p.

Quartile : Q1, Sujet : AGRICULTURE, DAIRY & ANIMAL SCIENCE

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Feed efficiency (FE) is the amount of body weight gain for a given feed intake. Improving FE through selective breeding is key for sustainable finfish aquaculture but its evaluation at individual level is technically challenging. We therefore investigated whether individual routine metabolic rate (RMR) was a predictor of individual FE in the European sea bass Dicentrarchus labrax, a major species in European mariculture. The European sea bass has three genetically distinct populations across its geographical range, namely Atlantic (AT), West Mediterranean (WM), and East Mediterranean (EM). We compared FE and RMR of fish from these three populations at 18 or 24 °C. We held 200 fish (62 AT, 66 WM, and 72 EM) in individual aquaria and fed them from ad libitum down to fasting. FI was assessed for an ad libitum feeding rate and for a fixed restricted ration (1% of metabolic body weight·day−1, with metabolic body weight = body weight0.8). After being refed 12 wk in a common tank, individual RMR was measured over 36 h by intermittent flow respirometry. There was a significant effect of temperature whereby fish at 18 °C had greater mean FE (P < 0.05) and lower RMR (P < 0.001). There was also a significant effect of population, where AT fish had lower FE (P < 0.05) and greater RMR (P < 0.001) than WM and EM, at both temperatures. Despite these differences in temperature and population means, individual FE and RMR were not significantly correlated (P > 0.05). Therefore, although the results provide evidence of an association between metabolic rate and FE, RMR was not a predictor of individual FE, for reasons that require further investigation.

Mots-clés Agrovoc : Dicentrarchus labrax, efficacité conversion alimentaire, prise alimentaire (animaux), aquaculture, taux métabolique, poids corporel, gain de poids, métabolisme, mariculture

Mots-clés géographiques Agrovoc : mer Méditerranée

Mots-clés libres : Aquaculture, Genetic populations, Individual rearing, Oxygen consumption, Respirometry

Agences de financement hors UE : Centre de Coopération Internationale en Recherche Agronomique pour le Développement, Consortium of International Agricultural Research Centers, International Fund for Agricultural Development

Auteurs et affiliations

• Rodde Charles, IFREMER (FRA) - auteur correspondant
• De Verdal Hugues, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-1923-8575
• Vandeputte Marc, INRAE (FRA)
• Allal François, IFREMER (FRA)
• Nati Julie, IFREMER (FRA)
• Besson Mathieu, SYSAAF (FRA)
• Blasco Felipe R., UFSCar (BRA)
• Benzie John A.H., UCC (IRL)
• McKenzie David J., CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605894/)

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