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http://dx.doi.org/10.5657/KFAS.2020.0090

Microstructural Differentiation of the Oocyte in the Abalone Haliotis discus hannai  

Kim, Hyejin (Southeast Sea Fisheries Research Institute, National Institute of Fisheries Science)
Kim, Hyeon Jin (Department of Aqualife Medicine, Chonnam National University)
Kim, Young Sook (Pathology Division, National Institute of Fisheries Science)
Lee, Jung Sick (Department of Aqualife Medicine, Chonnam National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.53, no.1, 2020 , pp. 90-97 More about this Journal
Abstract
The purpose of this study was to provide basic information on sexual maturity and reproductive biology for the management of biological resources in abalone Haliotis discus hannai. The nucleus of the oogonium occupied about 42% of the cytoplasm, and had a distinctive basophilic chromatin. The cytoplasm of previtellogenic oocytes was homogeneous and the size of nuclear pores increased. Fine granular and vacuolar yolk granules were observed in the cytoplasm of the initial vitellogenic oocyte. In this stage, the egg stalk and jelly membrane began to develop. The nucleus of the active vitellogenic oocyte was located near the animal pole. Yolk granules were strongly acidophilic. Lampbrush chromosomes were observed in the nucleus and rough endoplasmic reticulum. Annulate lamellae developed in the cytoplasm. The shape of the ripe oocyte was rounded polygonal. The size of ripe oocytes was 202.9±21.40×142.1±18.82 ㎛ and the thickness of the jelly membrane was 10.1±1.52 ㎛. These results show that yolk accumulation in H. discus hannai is based on two methods: exogenous accumulation, through the egg stalk, and endogenous accumulation, through intracellular organelles. Management of biological resources will be necessary when oocytes predominate after the active vitellogenic stage.
Keywords
Haliotis discus hannai; Oocyte; Microstructural differentiation;
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