Reproduction and Atretic Follicle of Net Cage Cultured Abalone, Haliotis discus hannai
Jung Jun Park, Byeong-Hak Kim, Hye-Sung Choi, Se Ra Yoo and Yu Ri Shin
Aquaculture Management Division, South Sea Fisheries Research Institute, NIFS, Yeosu 59780, Korea
This study describes the ovarian development and the first report on atretic follicle in net cage cultured abalone, Haliotis discus hannai in Nohwa, Soan, Cheongsan, Bukpyeong, Korea. Sex ratio analysed male lower than female (1:0.56-0.89) and especially, there were significant differences in the cases of Nohwae, Soan, and Bukpyeong. The spawning period was sparse. Atretic follicles were observed from March to December at all research sites, and the rate of occurrence was high at ripe stage (from April to September). It is suggested that spawning disruption is caused by the atretic follicle. The process of the atretic follicle initially showed vacuolization in the cytoplasm, and the concensation nucleus with the aggregation of Vtg granules, The aggregated Vtg granules were absorbed and then only the jelly layer remained. Finally, the jelly layer was also degenerating.
  
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