Study of histomorphological of the digestive tract of Large-eye dentexDentexmacrophthalmus and Dusky spinefootSiganusluridus, from Misurata coast of Libya

Abstract

Morphological and histological studies in order to improve our understanding on the digestive tract and feeding of Dentexmacrophthalmus and Siganusluridus, morphological and histological features of the gut were studied. Light microscope, hematoxylineosin and eosin staining were used in order to elucidate the histological features of the digestive tract of sections. Morphologically, the present study indicate that, has short oesophagus, stomach like tube and short tubular intestine, while has long oesophagus, U-shaped stomach and long tubular intestine. Histologically, the oesophagus were lining with stratified squamous epithelia in the anterior portion, which turned into a columnar epithelium towards the stomach in all study fishes. Mucosa of oesophagusD. macrophthalmus had numerous goblet cells while it was had tubular glands of S. luridus. Furthermore, oesophagus mucosa of D. macrophthalmushad pyramidal shaped folds and branched, while it was long and relatively coiled of S. luridus. The stomach Mucosa in two species were distinguished gastric glands. The intestinal had villi tallar in the anterior part compare with posterior part of fish S. luridus. On the other hand, it was villi short in all regions intestine of D. macrophthalmus. A simple columnar epithelium and goblet cells, lined the intestines of the study fish. In addition, S. luridus had numerous crypts into basal of villi.Lamina propria in all regions of gut was loose connective tissue rich with blood vessels. The muscle tunica in oesophagus of study fishes were striated muscles, suddenly changed to smooth muscles. The results indecator that, the histomorphology of the digestive tract in study fishes were congruent with its feeding habits