Comparative histomorphology of esophagus and intestine in two carnivorous and phytoplankton feeder fish of persian gulf

liza abu and Johnius belangerii are high economic value for marketplace in Persian Gulf region. In this study, the histomorphologic differences of the esophagus and intestine between Liza abu as a phytoplankton feeder and Johnius belangerii as a carnivorous was studied.For this purpose, 20 pieces of fish were harvested from any species with the same biometric characteristics from musa creeck. After describtion, tissue samples eere picked up of beginning and end of esophagus, also parts of the primary, middle and end of the intestine. Tissue samples after the usual stages of preparation including fixation in 10% formalin buffer, dehydration with alcohol series, clarification with xylol, paraffin blocking, cutting with 5µ, transfer of specimens on a lam, and coloring, finally examined with a light microscope equipped with a dinolite lens. Results of micrometric studies showed that the esophagus in both species in mucous membranes had multiple folds and its epithelium was squamous with secreted cells. The number of these cells was significantly higher in the end region than to the primary (p≤0.05). Although it was true in primary part for liza abu and end part for Johnius belangerii. From beginning to the end of the intestine it was also increased the number of mucosal cells also the length of intestine villi  in the middle part was higher than to the other sections. The length of intestine villi in liza abu in primary, secondry and end was higher than to the Johnius belangerii (p≤0.05). Generally, in histomorphology of the esophagus and intestine of the two studied species, there were differences and similarities in structural that could be affected by how to live and feed.