Resumo

GUZMAN BELTRAN, Leslie et al. An anatomical and histological description of the digestive tract of Bloch's catfish Pimelodus blochii (Valenciennes, 1840). Orinoquia [online]. 2013, vol.17, n.1, pp.102-110. ISSN 0121-3709.

P. blochii from the Magdalena and the Orinoquía basins is a very important for human consumption. However, most of its basic biology is unknown. For this reason an anatomical and histological description of its digestive tract an accesory glands was made. Seven individuals were sacrificed and processed for paraffin histology. Semiserial sections were obtained and stained with H&E. Anatomically, this species has no tongue, oesophagus is short and muscular, stomach is relatively large and muscular. The intestine has an intermediate length, with scarce muscle. The liver did not show any lobes and the pancreas is diffuse. Histologically, P. blochii did presents a tissular organization similar to other teleosts, having four layers: mucosae, submucosae, muscular and serous. Oesophagus mucosae is made by squamous stratified epithelium with a large number of globet cells, submucosae (similar for stomach and intestine) does exhibit a loose connective tissue, muscular layer presents internal longitudinal and external circular striated muscle. Stomach mucosae has simple cilindrical epithelium, with many tubular gastric glands in the cardiac and fundic areas, and few of these glands in the piloric area. The intestine epithelium is similar to the oesaphagus epithelium, but with more globet cells and with folds. Stomach and intestine muscular layers are made by external smooth muscle layer and a internal smooth muscle layer. Liver does present row arranged hepatocytes with large and generally centered nuclei. In pancreas two different tissular arrangements were present: exocrine with acinary cells, and endocrine with Langerhans islets. A relatively large mouth, a short oesophagus, a large muscular stomach with many gastric glands, and an intermediate length intestine (intestinal coefficient 0.93), would indicate that P. blochii in an ommivorous fish with a carnivorous tendency.

Palavras-chave : Silurids; catfishes; feeding habits; basic biology; accessory glands.

        · resumo em Português | Espanhol     · texto em Espanhol     · Espanhol ( pdf )