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Oogenesis of Microphysogobio yaluensis (Pisces, Cyprinidae) in the Korean Endemic Species  

Kim, Jae Goo (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
Reu, Dong Suck (Department of Life Science, Cheongju University)
Park, Jong Yong (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
Publication Information
Korean Journal of Ichthyology / v.29, no.4, 2017 , pp. 252-257 More about this Journal
Abstract
The oogenesis of the Microphysogobio yaluensis was investigated using light microscopy. Various developmental oocytes appeared in the ovary of the M. yaluensis. The oogenesis is largely divided into four stages: nuclear-chromatin stage, peri-nucleoli stage, vitellogenesis (yolk vesicle and yolk granule stages), and mature stage. The nuclear-chromatin is distributed in a large germinal vesicle as threads. The peri-nucleoli stage has many acidic nucleoli lining at the inner side of the nuclear membrane and an egg envelope just weakly starts. As the oogenesis gradually proceeds, they change to the vitellogenesis stage. The oocyte become to drastically increase and the marginal area of the ooplasm is covered with many vacuoles showing no negative reactions with hematoxylin and eosin staining, called the yolk vesicle stage. Many yolk vesicles-owned oocyte largely increase and as the development continues, its ooplasm is changed from the yolk vesicles to the yolk granules of eosinophilic. At the mature stage, lots of granules merged into a big yolk mass, acidophilic. Even at the mature stage, the egg envelope was still thin between the ooplasm and the follicular layer of the oocyte.
Keywords
Korean Endemic Species; Microphysogobio yaluensis; oocyte; oogenesis; Cyprinidae;
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