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KMID : 0613820130230080998
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Journal of Life Science
2013 Volume.23 No. 8 p.998 ~ p.1003
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Effects of Estradiol-17β on the Feminization of Japanase Eel, Anguilla japonica
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Kim Dae-Jung
Lee Bae-Ik
Kim Kyung-Kil
Kim Eung-Oh
Son Maeng-Hyun
Seong Ki-Baik
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Abstract
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The effects of oral administration of estradiol-17β (E2) on glass eels (Body weight: 0.16±0.05g, Total length: 6.2±0.9cm) and young eels (Body weight: 2.6±0.6g, Total length: 13.2±0.6cm) on gonadal sex and growth were examined, respectively. Glass eels were fed a diet containing E2 at a dose of 10 mg/kg or 25 mg/kg, respectively, for five months. The female ratio significantly increased in all E2-treated groups (10 mg/kg diet group: 70%; 25 mg/kg diet group: 90%) when compared to the control group (10%). Young eels were fed a diet containing E2 at a dose of 25 mg/kg for four months. The female ratio also significantly increased in the E2-treated groups (60%) compared to the control group (20%). The highest female ratio was observed in the stage of glass eels rather than young eels. In all experiments, however, the growth of eels treated with E2 was similar to that of controls to the end of the experiment. Thus, oral administration of E2 could be a good approach to controlling sex differentiation.
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KEYWORD
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Eel, Anguilla japonica, estradiol-17β, oral administration, feminization, sex ratio
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