Henneguyosis in gills of Metynnis hypsauchen: an Amazon freshwater fish

  • Rayline Thaimenne Alves Figueredo
  • Jhonata Eduard Farias de Oliveira
  • Maria do Perpétuo Socorro Progene Vilhena
  • José Berredo
  • Weverton John Pinheiro dos Santos
  • Edilson Matos
  • Michele VelascoEmail author
Original Article


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.


Silver dollar pacu Myxospore Parasitic fauna Amazon River 



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.

Author’s Contribution

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.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethics approval and consent to participate

All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted (CEUA 013/2014).


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Copyright information

© Indian Society for Parasitology 2019

Authors and Affiliations

  • Rayline Thaimenne Alves Figueredo
    • 1
  • Jhonata Eduard Farias de Oliveira
    • 1
  • Maria do Perpétuo Socorro Progene Vilhena
    • 1
  • José Berredo
    • 2
  • Weverton John Pinheiro dos Santos
    • 3
  • Edilson Matos
    • 3
  • Michele Velasco
    • 4
    Email author
  1. 1.Universidade Federal Rural da Amazônia (UFRA)Tomé-AçuBrazil
  2. 2.Museu Paraense Emílio GoeldiBelémBrazil
  3. 3.Laboratório de Pesquisa Carlos AzevedoUniversidade Federal Rural da Amazônia (UFRA)BelémBrazil
  4. 4.Universidade Federal Rural da Amazônia (UFRA)ParagominasBrazil

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