The digestive tube of Piaractus brachypomus: gross morphology, histology/histochemistry of the mucosal layer and the effects of parasitism by Neoechinorhynchus sp.

Autor: de Oliveira MIB; Departamento de Morfologia, Universidade Federal do Amazonas, Manaus, Brazil.; Programa de Pós-Graduação em Ciências Pesqueiras nos Trópicos, Universidade Federal do Amazonas, Manaus, Brazil., de Matos LV; Departamento de Morfologia, Universidade Federal do Amazonas, Manaus, Brazil., da Silva LA; Laboratório de Ecotoxicologia Aquática da Região Amazônica, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil., Chagas EC; Programa de Pós-Graduação em Ciências Pesqueiras nos Trópicos, Universidade Federal do Amazonas, Manaus, Brazil.; Embrapa Amazônia Ocidental, Manaus, Brazil., da Silva GS; Departamento de Morfologia, Universidade Federal do Amazonas, Manaus, Brazil., Gomes ALS; Departamento de Parasitologia, Universidade Federal do Amazonas, Manaus, Brazil.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2019 Apr; Vol. 94 (4), pp. 648-659. Date of Electronic Publication: 2019 Mar 18.
DOI: 10.1111/jfb.13934
Abstrakt: 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.)
Databáze: MEDLINE
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