The biological production process of a mysid (Archaeomysis kokuboi) in the slope of a sandy beach
1995
Kaneko, K. (Tohoku Univ., Sendai (Japan). Faculty of Agriculture) | Okata, A.
A mysid, Archaeomysis kokuboi have a large standing crop in the slope of the sandy beaches of surf zones all year round. In order to make clear the functional role of the ecosystem of the surf zone, the authors investigated the biological production in the course of the life history of the A. kokuboi. Judging from the interval between the appearance of the young and the transition of the larval stages in the marsupium, the mysids reproduce almost all year round except in the period from late January to early March. The reproductive cycle is 26-30 days from November to January and 15-22 days from April to July. Moreover, seeing the growth curves of the population estimated by laboratory experiment and the size frequency distribution of female mysids carrying embryo, it is clear that the growth of individuals in the population released after April is faster than the growth of individuals in the population released from November to January. The individuals in the population released after April take part in the reproduction during from June to July in smaller body size than the individuals in the population released from November to January
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