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Journal of Fisheries and Aquatic Science

Year: 2010 | Volume: 5 | Issue: 5 | Page No.: 386-393
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Authors

Imtiyaz Hussain Mir

Ashok Channa

Keywords

Research Article

A Scanning Electron Microscopic Examination of the Intestinal Tract of the Snow Trout, Schizothorax curvifrons Heckel

Imtiyaz Hussain Mir and Ashok Channa
The topological architecture of the entire intestinal tract of the snow trout, Schizothorax curvifrons has been investigated with the aid of great field of depth and resolving power of Scanning Electron Microscope (SEM) after carrying out their primary fixation in 2.5% glutaraldehyde in 0.1 M sodiumcacodylate buffer (pH 7.3) for 24 h at 0-4°C and secondary fixation in 1-4% osmiumtetraoxide in 0.1 M sodiumcacodylate buffer (pH 7.3) for 1-2 h at 0-4°C. The mucosa of both the intestinal bulb and intestine possess numerous longitudinal major or primary mucosal folds exhibiting zigzag pattern of arrangement, equipped with many minor or secondary mucosal folds. A distinct concavity is noted to be present between major and minor mucosal folds in case of intestinal bulb, however, in case of intestine the concavity is present between two major mucosal folds. Besides, the mucous secreting goblet cells and prominent microridges of the columnar epithelial cells of both the intestinal bulb and intestine are quite distinct. On the other hand, the rectal mucosa shows highly irregular fashion of major mucosal folds, minor mucosal folds and concavity being absent. A thin film of mucin spread over the mucosal folds and the beautiful mucosal pores through which mucous cells discharge their contents have been also observed in the rectal mucosa during the present investigation. The significance and possible roles of these structures in relation to feeding, digestion, absorption, defecation and other physiological processes are described in this study, setting thereby a platform for future studies in relation to pathology, pollution and stress conditions in aquaculture, natural and polluted environments, so prevalent in the world today.
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