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Isosmotic enviroment improves growth rates through a more efficient intestine and a metabolic orchestration in the gilthead sea bream (Sparus Aurata)

AuthorsMancera, Juan Miguel; Simó-Mirabet, Paula; Balmaceda-Aguilera, Carolina; Gilannejad, Neda ; Rodríguez-Velásquez,Liliana; Pérez-Sánchez, Jaume ; Martínez-Rodríguez, Gonzalo ; Martos-Sitcha, Juan Antonio
Issue Date2-Jul-2019
CitationSEB 2019 Annual Meeting
AbstractThe gilthead sea bream (Sparus aurata) is an euryhaline teleost species with an unmatched capacity for osmoregulatory adaptation. Moreover, environmental salinities that differ from the internal milieu produce a great energetic cost to regulate active ion transport. The present study evaluates, in an 11-weeks feeding trial using a RAS system, the effect of three different environmental salinities (brackish water, BW: 18 ppt; seawater, SW: 37 ppt; and high salinity water, HSW: 55 ppt) on osmoregulatory capacity, growth performance, stress processes and metabolism in S. aurata juveniles (~7 g initial mean body mass). Plasma osmolality did not show significant differences among the three experimental groups, demonstrating the good osmoregulatory acclimation of fish despite the wide range of environmental osmolalities assayed (500-1720 mOsm/kg). Even so, the metabolic orchestration related to glucose, triglycerides and lactate confirms a clear energy repartitioning at hepatic and muscular levels, indicating that the higher energy budget invested for osmoregulatory function produces a salinity-dependent reduction in growth-related parameters. In this regard, BW-acclimated fish enhanced feed intake and feed efficiency when compared to fish kept under hyperosmotic (SW and HSW) environments, which is translated into better growth rates. All these features can be attributed to a shorter (BW < SW ¿ HSW) but more specific intestine for nutritional purposes. Finally, important stress-related markers at hypothalamic (corticotrophin releasing hormone, crh binding protein), hypophyseal (proopiomelanocortin a and b) and plasma (cortisol) levels will be unraveled as putative endocrine mediators of the metabolic and osmoregulatory capacity of acclimated fish
DescriptionTrabajo presentado en en la Society for Experimental Biologia(SEB) 2019 Annual Meeting, celebrado en Sevilla (España), del 2 al 5 de julio de 2019
Appears in Collections:(ICMAN) Comunicaciones congresos
(IATS) Comunicaciones congresos
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