完熟に伴うマコガレイ卵母細胞の吸水と濾胞破裂の促進について〔魚類の排卵機構に関する研究-1-〕

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Some aspects of the mechanisms of teleostean ovulation were analyzed using plaice Limanda yokohamae as material. Five hundred I. U. human chorionic gonadotropin (HCG) was injected into mature female plaice to induce meiotic maturation and ovulation. HCG injection promoted the imbibition of water into body to increase its weight by over 20%, and via blood most of it was gathered into the ovary. Marked hydration or dehydration could not be observed in the other body compartments of the ovulating females. Apparently 70% of water influx into the whole ovary was absorebed by the full-grown yolky oocytes just maturing and ovulating, which resulted in the increase of follicle volume by nearly 67% within 48 hours after HCG injection. Then ovulation occurred after a while without exception. Therefore the very abrupt absorption of water by the ripening oocytes may raise the inner pressure or the envelope tension of follicles enough to cause them to rupture, that is, ovulation. The problem of the endocrine control of ovulation in teleosts are briefly discussed from both the above and other angles.
日本水産學會の論文