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Online Journal of Veterinary Research

Volume 23 (10):1038-1043, 2019.

Seasonal and histological impacts of Myxobouls niloticus on Labeo niloticus Nile carp.


Abdel-Baki AS1 Sakran TH1, Fayed H2, Zayed E1


1Zoology Department(s), Faculty of Science(s), Beni-Suef University, 2Cairo University, Egypt




Abdel-Baki AS ,Sakran TH, Fayed H, Zayed E., Seasonal and histological impacts of Myxobouls niloticus on Labeo niloticus Nile carp. Onl J Vet Res., 23 (10):1038-1043, 2019. We report effect of season on prevalence of myxobouls niloticus on labeo nilocitus carp in the Nile river, Egypt. Fish (n=86) were collected monthly for 12 months. We found overall prevalence of ~21% Myxobolus niloticus during winter ~14%, spring 41%, summer 13% and autumn 13%. Mean myxospore morphology length and width of cysts was determined from calibrated ocular photomicroscope. Plasmodia were collected from tail, fin rays and operculum. Fish were infested with 1 to 7 cysts measuring 0.8mm wide and 0.6mm long. Spores were oval to sub-spherical 12.5 0.5nm long by 9.9 0.3nm wide. Plasmodia were located on the outer surface of the hemi-segments under basal lamina associated with connective tissue cells forming chondrifying collagen. However, we found no morphological changes in the cartilaginous structure of the hemi-segments and no inflammatory reaction. The infection caused only mild fin lesions.


Key-Words: Myxobouls niloticus, Labeo niloticus, Nile, carp, prevalence.