Abstract
This study describes aspects of infection caused by Myxozoa of the genus Henneguya sp. in gills of fish belonging to the species Metynnis hypsauchen. Two sampling were made in the Capim river, close to the Ribeira community, in the municipality of Ipixuna do Pará, State of Pará, Brazil, during the months of August 2018 and March 2019. The animals were captured and transported live to the Laboratório de Pesquisa Carlos Azevedo, at the Universidade Federal Rural da Amazônia (UFRA), in Belém, Pará, Brazil. The animals were examined, and after parasitism was confirmed, Differential Interference Contrast Microscopes were used, to evaluate the parasite spores. Ziehl–Neelsen stain techniques were used in histology. Necroscopic analyses of Metynnis hypsauchen specimens found parasites in 80% of the hosts (16/20), with whitish-colored cysts in the branchial filaments, containing mature spores of the genus Henneguya. The histopathological analysis indicated large areas with cystic lesions with associated ischemic necrosis. The descriptions from this study indicate that the parasite drastically compromises the host’s respiratory system. Additionally, it is worth noting that parasite fauna studies of fishes in the Capim river are still a vast topic for research; this is the first record of infection by Henneguya sp. in Metynnis hypsauchen, captured in the Capim river in Ipixuna do Pará.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.
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Acknowledgements
The authors thank the Laboratório de Pesquisa Carlos Azevedo and the Museu Paraense Emílio Goeldi, for all of their structural support in carrying out the experiments.
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All authors participated in the study design. Manuscript writing was done by first author. Corresponding author participated planning and supervision of the work. All authors critically read and approved of the final manuscript.
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Figueredo, R.T.A., de Oliveira, J.E.F., Vilhena, M.P.S.P. et al. Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish. J Parasit Dis 44, 213–220 (2020). https://doi.org/10.1007/s12639-019-01183-7
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DOI: https://doi.org/10.1007/s12639-019-01183-7