DAO 90:207-213 (2010)  -  DOI: https://doi.org/10.3354/dao02241

Ultrastructural characteristics and histological impacts of Myxobolus naffari (Myxozoa: Myxosporea) infecting Nile labeo Labeo niloticus (Osteichthyes: Cichlidae)

A. S. Abdel-Baki1,2,*, T. Sakran2, H. Fayed3, E. Zayed2

1Zoology Department, College of Science, King Saud University, PO Box 12455, Riyadh 11451, Saudi Arabia
2Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
3Zoology Department, Faculty of Science, Cairo University, Giza, Egypt

ABSTRACT: We describe the ultrastructural characteristics and histological impacts of Myxobolus naffari Abdel-Ghaffar et al., 1998, which infects the Nile fish Labeo niloticus. The prevalence of infection was 65%, with the maximum rate occurring during winter and a lower rate during summer. The histological impacts were manifested as a fusion of the gill epithelia, hyperplasia at the ends of the plasmodia, and atrophy of the external surface of the plasmodia. The ultrastructural study revealed that the plasmodial wall was composed of a single unit membrane and bound externally by a thick layer of collagen fibers. The earliest recognizable stage was the disporous pansporoblast. The development of the parasite was asynchronous, with mature and immature spores randomly distributed throughout the plasmodium.


KEY WORDS: Myxobolus naffari · Labeo niloticus · Ultrastructure · River Nile · Histology


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Cite this article as: Abdel-Baki AS, Sakran T, Fayed H, Zayed E (2010) Ultrastructural characteristics and histological impacts of Myxobolus naffari (Myxozoa: Myxosporea) infecting Nile labeo Labeo niloticus (Osteichthyes: Cichlidae). Dis Aquat Org 90:207-213. https://doi.org/10.3354/dao02241

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