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Diseases of Aquatic Organisms

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DAO 148:43-56 (2022)  -  DOI: https://doi.org/10.3354/dao03649

Henneguya species infecting the gastrointestinal tract of Clarias gariepinus from the Nile River

Walaa F. A. Emeish1,*, Marwa M. Fawaz2, Zeinab Al-Amgad3, Nermean M. Hussein4

1Fish Diseases and Management, Department of Fish Diseases, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt
2Department of Parasitology, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt
3General Authority for Veterinary Services, Qena Veterinary Directorate, Qena, Egypt
4Department of Zoology, Faculty of Science, South Valley University, Qena, Egypt
*Corresponding author:

ABSTRACT: As part of a study on parasitic infection in the African sharptooth catfish Clarias gariepinus, we found cysts of varying sizes in the stomach and intestine that contained myxospores with morphological features resembling those of the genus Henneguya. The present investigation was carried out with data on spore morphology and histopathology. Additionally, the myxozoan was identified using a molecular-based approach with 18S small subunit rDNA sequences. Based on the morphological characterization and tissue specificity of Myxozoa, 2 species of Henneguya were identified in the catfish stomach and intestine. Several histopathological changes were observed in the intestine which may affect fish performance and survival. The phylogenetic position of nucleotide sequences of the Henneguya species identified here were clustered with other fish-infecting Henneguya species. These sequences were deposited in GenBank. It appears that they potentially represent 2 species, denominated Henneguya sp. 1 and Henneguya sp. 2 according to the samples originating from the stomach and intestine, respectively. Although future investigations are needed for detailed morphological and molecular descriptions, this study documents the likely occurrence of infection with Henneguya noted for the first time, to our knowledge, in the digestive system of C. gariepinus in Egypt.


KEY WORDS: Myxozoa · Henneguya · SSU rDNA · Phylogeny · Catfish · Clarias gariepinus


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Cite this article as: Emeish WFA, Fawaz MM, Al-Amgad Z, Hussein NM (2022) Henneguya species infecting the gastrointestinal tract of Clarias gariepinus from the Nile River. Dis Aquat Org 148:43-56. https://doi.org/10.3354/dao03649

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