抄録
The larva of this species which hatched in the early summer of the year, grows rapidly at first, and measures 150mm in length, at the end of August. Then the male shrimp matures gradually and copurate with female at the late November while the ovary of some is extremely immature. In the cold winter the shrimps migrate to the deep portion of the southern sea. In the spring of next year, shirmps return to the coast again. In the season, ovary of the female matures gradually, while the sperm are preserved as before, which had been planted by the male at the time of copuration in last autumn. The ovary matures quickly at the season from April to May. The spawning probably occures in months of June to July. Young shrimps about 60mm in length, which appears in late July, these grow 110-112mm in middle of the August and attain 150mm in late of the same month. As the spent female dose not appear after the summer time, it may be concluded that the whole life of the shrimps finish in one year.
