Physiology of Finfish and Shellfish (2+1)

5.2.20. Gastro-Intestinal hormones

Secretion of gastric and pancreatic juice is regulated by hormones secreted by the intestinal mucosa in mammals and other vertebrates. These hormones are gastrin, secretin and cholycystokinin (CCK). In addition to these, a few other peptides have been identified. However, the position in fish is not clearly known. Salmon and some other teleosts exhibit gastrin like activity in the stomach. A CCK like hormone is also reported to be present in fishes, but its function is not definitely known. A third hormone secretin has been reported from Esox and stimulates the rate of pancreatic juice secretion.