GROWTH CHARACTERISTICS OF MICROPHYTOBENTHOS AS BIVALVE’S FOOD IN THE MUKAWA COAST, HOKKAIDO

Abstract

 The Mukawa coast is a good fishery of Japanese surf clam. The main food of clam in this sea area is a microphytobenthos. On the other hand, the turbid waters temporarily increase the dissipative modulus of this fishery. However, the finding of microphytobenthos is few in an openhearted littoral region. Therefore, the culture examination of microphytobenthos was executed. Consequently, the proliferation of microphytobenthos has the water temperature dependency. If it is as much as 5 degrees in the water temperature, the growth speed is high. Therefore, the growth rate that depends on water temperature and light quantum was modeled. The time change of the growth rate was calculated in spring.