Ultrastructural changes in the oocytes and hepatocytes associated with the maturation of gonads in the protogynous spinycheek grouper Epinephelus diacanthus (Valenciennes)

Rao, A Chandrasekhara and Krishnan, L and Sanil, N K (2014) Ultrastructural changes in the oocytes and hepatocytes associated with the maturation of gonads in the protogynous spinycheek grouper Epinephelus diacanthus (Valenciennes). Indian Journal of Fisheries, 61 (1). pp. 118-123.

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    Abstract

    Ultrastructural changes in the oocytes and hepatocytes in the female Epinephelus diacanthus were studied with the progress of maturation. Transmission electron microscopic (TEM) observations revealed cytological changes associated with ovarian development. Nucleolus number increased in the perinucleolus stage, which is an indirect indication of increase in protein synthesis with the onset of oogenesis. Zonation of yolk sphere and presence of microvilli in the zona radiata were observed in mature oocytes. In comparison to the immature phase, mature/ripe satge hepatocytes showed greater development of both endoplasmic reticulum and increased density of mitochondria in the cytoplasm which is an evidence of progress in vitellogenin synthesis.

    Item Type: Article
    Uncontrolled Keywords: Gonad maturation; Hepatocyte; Nucleolus; Oocyte; Ultrastructure; Zonation of yolk
    Subjects: Fishery biology
    Demersal Fishes > Groupers
    Divisions: CMFRI-Kochi > Biodiversity
    Subject Area > CMFRI > CMFRI-Kochi > Biodiversity
    CMFRI-Kochi > Biodiversity
    Subject Area > CMFRI-Kochi > Biodiversity
    Depositing User: Arun Surendran
    Date Deposited: 12 May 2014 09:17
    Last Modified: 09 Sep 2015 15:58
    URI: http://eprints.cmfri.org.in/id/eprint/10052

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