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The Scientific World Journal
Volume 2017, Article ID 8591249, 9 pages
https://doi.org/10.1155/2017/8591249
Research Article

Histomorphological Description of the Digestive System of Pebbly Fish, Alestes baremoze (Joannis, 1835)

1Abi Zonal Agricultural Research & Development Institute, National Agricultural Research Organisation, P.O. Box 219, Arua, Uganda
2College of Veterinary Medicine, Animal Resources & Biosecurity, Makerere University, P.O. Box 7062, Kampala, Uganda
3Aquaculture Research & Development Center, National Agricultural Research Organisation, P.O. Box 530, Kampala, Uganda

Correspondence should be addressed to Victoria Tibenda Namulawa; moc.oohay@ykyvadnebit

Received 15 February 2017; Revised 1 May 2017; Accepted 14 May 2017; Published 17 July 2017

Academic Editor: Thomas E. Adrian

Copyright © 2017 Nasser Kasozi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Histomorphological studies of the digestive system of Alestes baremoze captured from Lake Albert, Uganda, were done using standard procedures. These revealed that A. baremoze has a fleshy-lipped terminal small mouth, large molar, short oesophagus, a three-lobed liver, pouch-like stomach, a nine-fingered caeca, and a long tubular intestine. A stratified squamous epithelium with numerous mucus-secreting cells lined the lips with no taste buds. Stratified squamous epithelia lined the oesophagus in the anterior portion which turned into a columnar epithelium towards the stomach. The lamina propria had numerous tubular glands throughout the entire oesophageal length. The stomach consisted of three distinct regions (cardiac, fundic, and pyloric) with distinguished lamina propria glands. The intestinal mucosa was thrown into villi of varying heights, with the tallest in the anterior part, lined with a simple columnar epithelium with numerous lymphocytes-like infiltrations. Numerous goblet cells appeared in the intestinal lamina epithelialis; these increased uniformly towards the anal opening. The liver was divided into lobules, with a central vein. Hepatocytes were visibly arranged closely, forming irregular cords, and the scattered tubular acinar glands formed the exocrine pancreas (hepatopancreas). Stomach content analysis indicated that the fish eats plankton, mollusks, crustaceans, and insects as the main proportion of its diet.