36 JUNE 2016 • WORLD AQUACULTURE • WWW.WAS.ORG Future Perspectives Remodeling of the digestive tract of the Atlantic halibut, specifically stomach development and volume growth, occurs during metamorphosis, and morphological modifications are connected with a set of functional changes. During metamorphosis the stomach is functionally differentiated and gastric acid secretion and protein digestion emerges. This significantly improves protein digestion and thus is a crucial moment in the life of a halibut larva. In addition, new appetite signal pathways from digestive system to brain may start to develop during this stage, with development of stomach storage capacity and expression of important appetite hormones such as ghrelin. Overall, these results have opened new technical resources that can contribute to a better understanding of stomach function development during fish metamorphosis. 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