Effects of Oral Administration of Estradiol-17β to Young on Gonadal Sex and Growth of Japanese eel Anguilla Japonica
1997 Volume 45 Issue 1 Pages 61-66
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1997 Volume 45 Issue 1 Pages 61-66
The effects of oral administration of estradiol-17β (E2) to young on gonadal sex and growth of Japanese eel were examined. Juveniles were fed on a diet containing E2 at a dose of 10 mg/kg diet for various periods after adaptation to the fomulated feed. The female ratio was significantly increased in all E2-treated groups when compared to the control. The highest female ratio was observed in the group reared for 4 months on the feed containing E2.
The growth of females treated with E2 was similiar to that of controls up to about 200g body weight. Thereafter, the growth of female eel treated with E2 was accerelated when compared to male of control. At the age of about 2.5 years, E2-treated females had grown to the same size of wild-caught sexually-maturing eels.
