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Ultrastructure and Development of Ceratomyxa protopsettae Fujita, 1923 (Myxosporea) in the Gallbladder of Cultured Olive Flounder, Paralichthys olivaceus
並列摘要
Spore morphology and sporogenesis process of Ceratomyxa protopsettae Fujita, 1923 found in the gallbladder of cultured olive flounder, Paralichthys olivaceus from southern Korea were studied by light-and transmission electron microscopy. Crescent-shaped mature spores were 11.64±0.95 μm in length, 46.63±5.8 μm in width (in sutural view). Two equal sized polar capsules were spherical, 4.15±0.34 μm in diameter and each contained a polar filament with five to six turns and an opening at the anterior end. A binucleate sporoplasm was distributed unequally in the spore cavity. There were numerous pinocytotic invaginations, and pseudopodia or rhizoidlike projections at the peripheral portion of trophozoites. Plasmodium was proliferated by endo- and exogenous budding. Asynchronous divisions of generative cells without pansporoblast formation give arise to two or more than spores within the trophozoite. Capsulogenic cells in the sporoblast had large amounts of rough endoplasmic reticulum, external tubules, and capsular primordia. Histologically, vacuolization and hyperplasia of the epithelium were seen in sections of the gallbladder of parasitized fishes.
延伸閱讀
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