イソゴカイの成熟と産卵の促進

概要

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As a method for accelerating the maturation of Perinereis nuntia var. vallata, the rearing temperature was regulated by means of an electric heater and a vinyl frame euclosure. In the frame rearing, begun from December, the height of swarming occured in early February when the heater was used and in mid-April when the heater was not used. In an ordinary rearing room, the height was reached in early March when the heater was used since December and in mid-April when the heater was used only from February. However, the height of the control, reared in an ordinary rearing room at room temperature was rearched in mid-May. The daily average temperature which existed during these swarmings was 23±3°C. According to these experiments, it would seem that maturity is controled by the total effective temperature calculated since the hatching time. The temperature was estimated at about 5500°C day. The worms had swarmed after maturity at about 23°C whcich was their environmental temperature. On induced spawning of the worm which metamorphosed to the epitoke stage, the experimentation was carried out with the regulation of water temperature and the occurrence of currents by the use of a syringe. The smoothest spawning was observed to take place when the water temperature was raised up to 3-5°C heigher than above mentioned swarming temperature. In this case, the spawned eggs had a high rate of fertilization.
日本水産學會の論文