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Title: Supplementation of arachidonic acid rich oil in European sea bass juveniles (Dicentrarchus labrax) diets: effects on growth performance, tissue fatty acid profile and lipid metabolism
Authors: Torrecillas, Silvia 
Betancor, M.
Caballero Cansino, María José 
Rivero-Ramírez, Fernando 
Robaina, L. 
Izquierdo, M. 
Montero, D. 
UNESCO Clasification: 3105 Peces y fauna silvestre
2510 Oceanografía
230218 Lípidos
251092 Acuicultura marina
310507 Hábitos de alimentación
Keywords: Arachidonic acid
Dicentrarchus labrax
Growth performance
Lipid metabolism
Tissue fatty acid profile
Issue Date: 2018
Journal: Fish Physiology and Biochemistry 
Abstract: The aim of this study was to evaluate the effects of increasing dietary arachidonic acid (ARA) levels (from 1 to 6% of total fatty acids) on European sea bass (Dicentrarchus labrax) juveniles’ growth performance, tissue fatty acid profile, liver morphology as well as long-chain polyunsaturated fatty acids (LC-PUFA) biosynthesis, triglyceride and cholesterol synthesis and lipid transport. A diet with total fish oil (FO) replacement and defatted fish meal (FM) containing a 0.1-g ARA g −1 diet was added to the experimental design as a negative control diet. Dietary ARA inclusion levels below 0.2 g ARA g −1 diet significantly worsened growth even only 30 days after the start of the feeding trial, whereas dietary ARA had no effect on fish survival. Liver, muscle and whole body fatty acid profile mainly reflected dietary contents and ARA content increased accordingly with ARA dietary levels. Tissue eicosapentaenoic acid (EPA), docosapentaenoic acid (DPA) and docosahexaenoic acid (DHA) levels were positively correlated among them. Hepatic lipid vacuolization increased with reduced dietary ARA levels. Expressions of fatty acyl desaturase 2 and 3-hydroxy-3-methylglutaryl-coenzyme genes were upregulated in fish fed the negative control diet compared to the rest of the dietary treatments denoting the influence of ARA on lipid metabolism. Results obtained highlight the need to include adequate n-6 levels and not only n-3 LC-PUFA levels in European sea bass diets.
ISSN: 0920-1742
DOI: 10.1007/s10695-017-0433-5
Source: Fish Physiology and Biochemistry[ISSN 0920-1742],v. 44, p. 283-300
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