Morfologia e histoquímica do tubo digestivo de Mapará Hypophthalmus marginatus

• Autor(a) principal: Pozzer, Roger Franzoni [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/132054; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/09-12-2015/000854850.pdf
• topic: Peixe; Aparelho digestivo; Bagre (Peixe); Morfologia (Animais); Histoquimica; Digestive organs

This study describes the morphology and histochemistry of the digestive tract of mapará, Hypophthalmus marginatus, a migratory and planktophagic catfish inhabiting Neotropical rivers and lakes. This fish is one of the main fishery stocks in the Amazon region and has desirable characteristics for aquaculture. However, there are few studies on its biology and rearing. In order to promote the development of aquaculture through information for a better understanding of the physiology of digestion, feeding habits, health and environmental quality, analyzes of gross anatomy, light microscopy and histochemistry of mucosubstances of the digestive tract were performed in adult H. marginatus collected from the wild. The digestive tract of this fish had the following morphological and functional characteristics: oropharyngeal cavity with numerous, long and slender gill rakers; short and muscular esophagus; U-shaped siphonal stomach, divided into cardic, fundic and pyloric regions, the latter well-developed; a coiled intestine, divided into anterior, middle, posterior and rectum, with the anterior and middle regions being the main nutrient absorption sites, while the posterior and rectum regions are responsible for the formation and elimination of feces. The histochemistry analysis revealed the presence of neutral and acidic mucosubstances, related to lubrication and epithelial protection, digestion, food transit and feces formation. The neutral mucosubstances were present in the esophagus, stomach and intestine, while acidic mucosubstances were identified only in the esophagus and intestine. The characteristics presented by H. marginatus elucidate its digestive tract adaptation for planktophagic feeding habit