HISTOPATHOLOGY OF ESOPHAGUS AND STOMACH OF A NEW BRAZILIAN SILURIFORMES HYBRID TRICROSS SURUBIM

Resumo

Hybrid tricross surubim are products of triple crosses among native surubim (Pimelodidae: Pseudoplatystoma corruscam), cachara (Pseudoplatystoma reticulatum), and the Amazonian jundiá (Pimelodidae: Leiarius marmoratus). To the best of our knowledge, the histology of the novel hybrid has not been reported. In the present study, we describe the histological and histochemical aspects of the esophagus and stomach of hybrid tricross surubim. In this research One hundred and sixty juvenile specimens were euthanized, fixed, and subjected to automated histological and histochemical procedures, and then microscopically examined. Three cell types were observed in the esophageal stratified epithelial mucosa: squamous to cuboidal superficial cells, oval claviforms and elongated goblets. The stratified epithelial mucosa was fused to the submucosa and lacked a mucous muscular layer. The mucosa tunic of the stomach presented a simple prismatic epithelium with acidic, neutral, and mixed mucus substances within goblet cells of mucosae of the esophagus and stomach. Organizational variations associated with the structures of the digestive tract were observed in the histological constituents, suggesting that hybrid tricross surubim are carnivores. However, hybridization has led to greater food diversity and flexibility for vegetable diets, which could facilitate improved nutritional management of the hybrids in captivity, as well as for other aquaculture fish.