AIM:To detect distribution and relative frequency of endocrine cells in gastrointestinal tract of flower fish (Pseudophoxinus antalyae ).METHOIS:The intestinal tract of flower fish was divided into four portions from proximal to distal;the enlarged area after oesophagus and anterior, middle and posterior intestine. Immunohistochemical method using the peroxidase anti-peroxidase complex was employed.All antisera between four portions of flower fish were compared using ANOVA.RESULTS:Eleven types of gut endocrine cells were determined; they were immunoreactive for calcitonin gene related peptide, substance P, vasoactive intestinal peptide, bombesin, somatostatin-14, secretin, TrkA, TrkB,TrkC, neurotensin, neuropeptide Y, which were found in almost all portions of the gastrointestinal tract.CONCLUSION:The regional distribution and relative frequency of immunoreactive cells in the flower fish,Pseudophoxinus antalyae, are essentially similar to those of other fish.