Effect of dietary macronutrients on the expression of cholecystokinin, leptin, ghrelin and neuropeptide Y in gilthead sea bream (Sparus aurata).

•Diet composition affects appetite-regulating peptide expression in Sparus aurata.•High protein diets increase cholecystokinin and ghrelin expression in intestine.•High carbohydrate diets and fasting upregulate ghrelin and neuropeptide Y in brain.•Fasting decreases leptin expression in liver and adipose tissue.