IGF1 and hydrops fetalis: Somatic indices and IGF-1 plasma levels of gilthead sea bream juveniles fed with a high-fat diet in the absence (HF) or presence (HF + HT) of hydroxytyrosol (0.52 g HT/kg feed), at a standard (ST) (3% biomass/tank) or restricted ration (RE) (40% daily reduction) for 8 weeks.