On the Eggs of Japanese Eel and Induction of Maturation by Hormone Injection

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The maturation of female Japanese eel (<I>Anguilla japonica</I> in sea-run stage) and the artificial acceleration of their maturity were studied, using 19 specimens obtained at the mouth of River Shimanto, Kochi Pref., from September through October, 1971.Majority of oocytes of the eel, about 0.3 mm in diameter, were at the oil drop stage characterized by numerous oil drops distributed throughout the cytoplasm and fine yolk globules occurring in the peripheral area of the cytoplasm.Some oocytes, larger than 0.4 mm in diameter, however, had numerous yolk globules in the outerhalf of the cytoplasm, and were at the primary yolk stage.The largest oocyte examind here reached to 0.59 mm in diameter.Specimens treated with dipropionic acid estradiol (follicular hormone) and"synahorin"from November 22, 1971 to the end of March, 1972 had eggs at much advanced stage.One specimen had some apparently mature eggs which were larger than 0.95 mm in diameter, and at the tertiary yolk stage.
日本魚類学会の論文