Seahorses have become an endangered species because of overfishing. Aquaculture could potentially compensatefor this decline, but its effect is limited since most seahorses raised in captivity die as from the age of 5 days. In thisstudy the histological analysis of the alimentary tract of larvae aged 7 and 33 days is described, to help to understandtheir digestive mechanisms. At day 7 a lot of mucins could be found in the oesophagus. They are suggestive of pregastricdigestion. At both ages, the stomach was observed as a sac-like distension cranially to the midgut, lackinggastric glands. A solid tubulus-shaped structure in between swimbladder and hindgut is suggestive of a regressingpneumatic duct.