カキに対するステロイドの影響-V. : 天然条件下のエストラジオール-17β注射による雌マガキのグリコーゲン分解促進

概要

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The effect of estradiol-17β on the tissue distribution of PAS-positive substance digestable by saliva-treatment, namely, glycogen was studied using the Japanese common oysters during sexual maturation. The experiments were carried out under natural conditions. In oysters in which no clear effect of steroid injection on sex reversal was found3), an acceleration of glycogenolysis by estradiol-17β was observed in females about a month (total steroid injected, 0.3 mg/oyster) and about 50 days (0.4 mg/oyster) after the start of injection. However, the injection of estradiol-17β had no accelerating effect on glycogenolysis in the experimental groups in which it could induce sex reversal from male to female3). From these results together with the other previous ones5), it may be concluded that the acceleration of glycogenolysis is antagonistic to the inducement of sex reversal and closely related to the acceleration of sexual maturation in the maturing female C. gigas.