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

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 i...

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Bibliographic Details
Published in:Diseases of aquatic organisms 2010-07, Vol.90 (3), p.207-213
Main Authors: ABDEL-BAKI, A. S, SAKRAN, T, FAYED, H, ZAYED, E
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Cichlidae
Cichlids
Fish Diseases - parasitology
Fish Diseases - pathology
Freshwater
Infectious diseases
Labeo
Medical sciences
Miscellaneous
Myxobolus
Myxosporea
Myxozoa
Myxozoa - ultrastructure
Osteichthyes
Parasitic diseases
Parasitic Diseases, Animal - parasitology
Parasitic Diseases, Animal - pathology
Plasmodium
Seasons
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Summary: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.
ISSN:0177-5103
1616-1580
DOI:10.3354/dao02241