The distribution and relative frequency of endocrine cells was studied in the stomach and intestine regions of the Dicentrarchus labrax, by immunohistochemistry using antisera against bombesin, cholecystokinin (CCK)-8, histamine, neurotensin, secretin, somatostatin-14, Trk A, Trk B, Trk C and vasoactive intestinal peptide (VIP).

As a result of immunohistochemical observations, immunoreactive cells studied were detected to be localized in different distribution and relative frequency in the stomach and intestine regions of Dicentrarchus labrax. Histamine, Trk B and Trk C immunoreactive cells were detected in the fundus and pylorus regions. Trk A immunoreactive cells were found in the anterior and posterior intestine. Cells reactive for CCK-8 and somatostatin-14 were demonstrated only in the anterior intestine.