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Trade-off effects of medium-chain fatty acids in the metabolic capacity and swim performance of gilthead sea bream fed different protein dietary sources

AuthorsMartos-Sitcha, Juan Antonio ; Simó Mirabet, Paula; Piazzon de Haro, María Carla ; Heras, Verónica de las ; Calduch-Giner, Josep A. ; Puyalto, Mónica; Tinsley, John; Sitjà-Bobadilla, Ariadna ; Pérez-Sánchez, Jaume
Issue Date2017
PublisherUniversidad de Vigo
CitationAdvances in comparative endocrinology: vol. IX: 57-60 (2017)
AbstractThe aim of this study was to evaluate the potential benefits of a commercial preparation of the medium-chain fatty acid (MCFA) heptanoate sodium salt (NOREL, HEPTON®) in a factorial design (2 x 2) with standard (20%, D1 and D2) or low (5%, D3 and D4) inclusion levels of fish meal (FM) as dietary protein source in an 11-weeks gilthead sea bream feeding trial. Heptanoate was added at 0.3% in D2 and D4 diets. Results of growth performance from 13-14 g to 81-84 g indicated a fast (SGR=2.2-2.3%) and efficient (FE=0.91-0.94) growth, with no changes in plasma IGF-I levels among fish fed the four experimental diets. Even so, an early impairment of FE, reversed by heptanoate supplementation, was observed in D1 FM-based diet. No signs of histopathological damage were found in any group, although higher hepatic glycogen depots were observed in fish fed both heptanoate-supplemented diets at the end of the trial. Other lasting heptanoate effects included changes on plasma antioxidant capacity, circulating cortisol and growth hormone (GH) levels, as well as in metabolic capabilities assessed by measures of oxygen consumption (MO2, mgO2/kg/h) and critical swimming speed (Ucrit) in swim performance tests. The pattern of respirometry metabolism closely resembled that of early FE, and the predictive value of plasma GH for different critical swimming speeds at fish exhaustion is suggested. Altogether, these results support the potential use of heptanoate to improve the healthy metabolic condition of farmed fish under sub-optimal rearing conditions.
DescriptionTrabajo presentado en el 11º Congreso de la Asociación Ibérica de Endocrinología Comparada (AIEC), celebrado en Vigo (España), del 13 al 15 de julio de 2017
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