Abdel-Baki A S, Sakran T, Fayed H, Zayed E
Zoology Department, College of Science, King Saud University, P.O. Box 12455, Riyadh 11451, Saudi Arabia.
Dis Aquat Organ. 2010 Jul 1;90(3):207-13. doi: 10.3354/dao02241.
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.
我们描述了感染尼罗罗非鱼的纳氏黏液球虫（Myxobolus naffari Abdel - Ghaffar等人，1998年）的超微结构特征和组织学影响。感染率为65%，最高感染率出现在冬季，夏季感染率较低。组织学影响表现为鳃上皮融合、疟原虫末端增生以及疟原虫外表面萎缩。超微结构研究表明，疟原虫壁由单层单位膜组成，外部由一层厚厚的胶原纤维层包裹。最早可识别的阶段是双孢子母孢子。寄生虫的发育是不同步的，成熟和未成熟的孢子随机分布在整个疟原虫中。
