Abstract

ATENCIO GARCIA, VJ; HERNANDEZ MUNOZ, J  and  PARDO CARRASCO, SC. Alimentary tract of juvenile Rubio Salminus affinis (Pisces: Characidae) morphological description. Acta biol.Colomb. [online]. 2008, vol.13, n.3, pp.97-110. ISSN 0120-548X.

The aim of work was giving biological information about Salminus affinis,a morphological description of the alimentary tract was carried out. Five juvenile Rubio were analyzed (23.6±2.6 cm of total length and 142.8±62.5 g of weight). Topographical and morphological description organs and histology with H-E stain were carried out. The esophagus is a short tubular thick-walled organ that represents 7.8% of the alimentary tract total length; it presents internal folds that offer great distension capacity allowing the step of great volume of bit meat. The stomach is an asymmetric bag in "Y" form, big and muscular, wide in anterior part and narrow toward the bottom; the number of pyloric cecum can vary between 13 and 23 and could be monotubular and branching. The intestine, with three loops, extends from the pyloric sphincter until the anus. Histologycally alimentary tract is formed by four layers: mucous, submucous, muscular and serous; the epithelium lining of the esophagus is stratified plane non keratinized with chaliced cells changing to simple cylindrical mucosecretor up to stomach; in the stomach epithelium simple cylindrical mucosecretor are found and the pyloric and intestine cecum are covered by cylindrical simple epithelium with chaliced cells. So the middle value of the intestinal coefficient (0.58), as the distensible wall of the stomach suggest that Rubio has an alimentary tract of carnivorous and its histologycal characteristics are similar with most of superior vertebrates.

Keywords : anatomy; fish; histology; intestine; Sinú river.

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