Molecular aspects of lipid metabolism, digestibility and antioxidant status of Atlantic bluefin tuna (T. thynnus L.) larvae during first feeding
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AuthorsBetancor, M.; Ortega-García, A. (Aurelio); de-la-Gándara, F. (Fernando); Tocher, D.R.; Mourente, G.
Atlantic bluefin tuna (Thunnus thynnus L.; ABT) larvae were fed on enriched rotifers Brachionus rotundiformis and copepod nauplii Acartia tonsa from first feeding to 15 days post hatching. Rotifers were enriched with five different commercial products: OG, MG, AG and RA plus selenium and vitamin E. Copepods (COP) were cultured with the algae Rhodomonas baltica. Metabolic processes were studied by determining the expression of 30 genes related to lipid metabolism (transcription factors, fatty acid metabolism and lipid homeostasis), antioxidant enzymes, myogenesis and digestive enzymes. Growth and development parameters and high expression of myogenesis genes myhc2 and tropo indicated that COP were better than enriched rotifers as live prey for first feeding ABT. COP and AG-fed larvae showed the lowest values for the transcription factors pparã and srebp2. The expression of fas showed differences among treatments, with highest relative expression in COP-fed larvae and those fed with RA ...
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