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Comparative study on the intestine of Schilbe mystus and Labeo niloticus in correlation with their feeding habits

2008; Egyptian Society for the Development of Fisheries and Human Health; Volume: 12; Issue: 4 Linguagem: Inglês

10.21608/ejabf.2008.2017

2536-9814

Fawzy Amer, Suzan Naguib, Fawzia Abd El-Rahman,

Fish Biology and Ecology Studies

he present investigation aims to illustrate the morphological, histological and ultrastructural differences in the intestine of a carnivorous fish, Schilbe mystus and a herbivorous fish, Labeo niloticus, in correlation with their feeding habits.The histological examination of the mucosa of the intestine of both studied species revealed that it is built up of a simple columnar epithelium that contains goblet cells.Though these, are generally more numerous in the intestine of Schilbe mystus than in that of Labeo niloticus.The ultrastructural investigation of the mucosa of the duodenum and ileum of Schilbe mystus revealed that the enterocytes are tall columnar cells and possess well-developed microvilli, numerous mitochondria, microtubules and numerous lipid droplets.The ultrastructural examination of the mucosa of the ileum of Labeo niloticus revealed that the enterocytes are tall columnar and possess well-developed microvilli, numerous mitochondria, microtubules, a few endocytotic channels and aggregated chylomicrons.The enterocytes of the rectum of both studied species are tall columnar and are characterized by the presence of short and wellspaced microvilli, a well-developed vesiculotubular system, numerous microtubules and mitochondria.In addition, the rectal enterocytes of Schilbe mystus contain endocytotic vesicles.The intestinal muscularis of both studied species is well-developed and built up of unstriated muscle fibres, which are arranged into two layers: an inner circular layer and an outer longitudinal one.The rectal muscularis of both studied species is thicker than that of the rest of the intestine.