The impact of egg thermal regimes on the response to food deprivation and refeeding in juvenile European Sea bass (Dicentrarchus labrax)

Fish are ectotherms and this means they highly vulnerable to changes in ambient temperature, particularly during early developmental stages when temperature can induce persistent effects on phenotypic traits. In study, the effect of egg incubation response juvenile European sea bass (Dicentrarchus labrax) food deprivation recovery after refeeding was assessed. Eggs were incubated at 11, 13.5 16 °C until hatching then reared a common 9 months fish deprived for one week. The from evaluated 10 h 2 days post-refeeding. Food eggs highest (16 °C) compared 11 exhibited most morphological metabolic liver foregut. Liver metabolism changed as revealed by significant reduction lipid area increased number hepatocyte nuclei. Foregut atrophy coupled up-regulation transcripts associated with gluconeogenesis (pck1) peptide absorption (pept1). A modified fast-refeed regime significantly decreased levels plasma lactate, which may result thyroid axis, deiodinase (dio2) lower (11 less following regime. did not modify morphology foregut parenchyma recovered sooner thermal other regimes refeeding. latter group had temporary stimulation GH-IGF axis insulin-like growth factor I II (igf-1 igf-2) fasting. (the standard hatchery stage) recover end experiment catalase (cat), encoding an antioxidant enzyme, downregulated regimes. Our results suggest that imprinting stage feeding resumed.