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

Type Article
Date 2021-06
Language English
Author(s) Rodde Charles1, 2, 3, 7, de Verdal Hugues1, 2, Vandeputte MarcORCID5, 7, Allal FrancoisORCID4, Nati Julie7, Besson Mathieu1, 7, Blasco Felipe R6, Benzie John A H3, McKenzie David7
Affiliation(s) 1 : CIRAD, UMR ISEM, 34398 Montpellier, France
2 : ISEM, Université de Montpellier, CNRS, EPHE, IRD, 34095 Montpellier, France
3 : Worldfish, Jalan Batu Maung, Bayan Lepas, 11960, Penang, Malaysia
4 : MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, 34250 Palavas-les-Flots, France
5 : Université Paris-Saclay, INRAE, AgroParisTech, GABI, 78350 Jouy-en-Josas, France
6 : Laboratório de Zoofisiologia e Bioquímica Comparativa, Departamento de Ciências Fisiológicas, Universidade Federal de São Carlos, São Paulo, 13565-905, Brasil
7 : MARBEC, Université de Montpellier, CNRS, Ifremer, IRD, 34250 Palavas-les-Flots, France
Source Journal Of Animal Science (0021-8812) (Oxford University Press (OUP)), 2021-06 , Vol. 99 , N. 6 , P. skab152 (?p.)
DOI 10.1093/jas/skab152
WOS© Times Cited 2
Keyword(s) aquaculture, genetic populations, individual rearing, oxygen consumption, respirometry
Abstract

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 Ocean (AT), West Mediterranean (WM) and East Mediterranean (EM). We compared FE and RMR of fish from these three populations at 18°C 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. Feed efficiency 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 weight 0.8). After being refed 12 weeks in a common tank, individual RMR was measured over 36h 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.

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Rodde Charles, de Verdal Hugues, Vandeputte Marc, Allal Francois, Nati Julie, Besson Mathieu, Blasco Felipe R, Benzie John A H, McKenzie David (2021). An investigation of links between metabolic rate and feed efficiency in European sea bass Dicentrarchus labrax. Journal Of Animal Science, 99(6), skab152 (?p.). Publisher's official version : https://doi.org/10.1093/jas/skab152 , Open Access version : https://archimer.ifremer.fr/doc/00694/80585/