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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI:

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

    Walaa F. A. Emeish*, Marwa M. Fawaz, Zeinab Al-Amgad, Nermean M. Hussein

    *Corresponding author:

    ABSTRACT: As part of a study of parasitic infection in the African sharptooth catfish Clarias gariepinus, we found cysts of varying size 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 stomach and intestine. Several histopathological changes were observed in the intestine which may affect fish performance and survival. The phylogenetic position of several nucleotide sequences of the present Henneguya 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.