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KMID : 0613820090190121851
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Journal of Life Science
2009 Volume.19 No. 12 p.1851 ~ p.1854
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Profile of Plasma Estradiol-17β According to Ovarian Development of the Pike Eel, Muraenesox cinereus
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Kim Dae-Jung
Kim Yi-Cheong
Son Maeng-Hyun
Lee Jung-Uie
Son Sang-Gyu
Han Chang-Hee
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Abstract
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This study correlated changes in the plasma levels of estradiol-17β (E2) with changes in the gonadosomatic index (GSI) and ovarian development during the annual reproductive cycle of the pike eel Muraenesox cinereus, collected at the Tongyung coast region. Ovarian maturity was classified based on histological observations; the perinucleolus stage (November to February), the oil droplet stage (March to April), the early vitellogenic stage (April to May) and the late vitellogenic stage (June to October). Seasonal changes in the GSI were correlated with water temperature and reflected the degree of ovarian maturity. Plasma E2 levels were correlated with changes in the GSI, which increased from April to a peak in July, and the levels remained comparatively high until October. These data indicated that changes in the GSI and plasma E2 levels are correlated with the annual ovarian activity of the pike eel. In this study, however, female pike eels were not collected during the spawning stage. Therefore, spawning of this species seemed to be closely related to its migration toward the deep sea of offshore.
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KEYWORD
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Pike eel, Muraenesox cinereus, annual reproductive cycle, estradiol-17β
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