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Title: | The digestive tube of Piaractus brachypomus: gross morphology, histology/histochemistry of the mucosal layer and the effects of parasitism by Neoechinorhynchus sp. |
Authors: | Oliveira, Maria Inês Braga de Matos, Lorena Vieira de Silva, Lídia A. da Chagas, Edsandra Campos Silva, Grazyelle Sebrenski da Gomes, Ana Lúcia Silva |
Keywords: | Acanthocephala Anatomy And Histology Animals Animals Parasitosis Characiformes Cytochemistry Cytology Esophagus Fish Disease Gastrointestinal Tract Host Parasite Interaction Intestines Metabolism Mucosa Parasitology Pathology Physiology Stomach Acanthocephala Animal Characiformes Esophagus Fish Diseases Gastrointestinal Tract Helminthiasis, Animals Histocytochemistry Host-parasite Interactions Intestines Mucous Membrane Stomach |
Issue Date: | 2019 |
metadata.dc.publisher.journal: | Journal of Fish Biology |
metadata.dc.relation.ispartof: | Volume 94, Número 4, Pags. 648-659 |
Abstract: | The objective of the present study was to describe the histology and histochemistry of the mucosal layer of the digestive tube of Piaractus brachypomus, and the histopathology associated with parasitism by Neoechinorhynchus sp. The digestive tube of P. brachypomus consists of three macroscopically distinct portions: short, rectilinear and elastic-walled ooesophagus, J-shaped siphon stomach and a long intestine with rectilinear and curved portions, defined by patterns of villi as foregut, midgut, and hindgut. Histological and histochemical differences were observed in the mucosal layers of the different digestive tube regions, such as intense production of neutral and acidic mucous substances in the pseudostratified mucosal epithelium of the oesophagus; positive periodic acid Schiff reagent (PAS)reactions at the apex of the columnar epithelial cells of the stomach and increased intensity of histochemical reactions in the hindgut region. Neoechinorhynchus sp. was present in 85.7% of specimens examined, with a mean intensity of 7.4 ± 6.2 (±) and abundance of 6.33. Good health of the fish indicated by high relative condition factor values ( Kn ) and occurrence of only mild to moderate alteration in the mucosal layer indicated that Neoechinorhynchus sp. exhibits low pathogenicity towards P. brachypomus hosts in farming environments, with low levels of infection. © 2019 The Fisheries Society of the British Isles |
metadata.dc.identifier.doi: | 10.1111/jfb.13934 |
Appears in Collections: | Artigos |
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