Chapter 20 Ecology of Strongylocentrotus intermedius

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This chapter describes the ecology of Strongylocentrotus intermedius (S. intermedius). It is found commonly on the rocky bottom in shallow waters around Hokkaido. It is harvested commercially in Iwate, Aomori, and Hokkaido, Japan. The roe flesh is eaten mainly as sashimi and sushi and is served in a bowl with rice. Salted raw urchin is a familiar food in Hokkaido. The gametogenic process is classified into five stages: recovery, growth, prematuration, maturation, and spent. S. intermedius, artificially produced from adults from the Sea of Japan and transplanted to the Pacific and eastern Tsugaru Strait coastal waters, maintains its own fixed reproductive cycle. The successive changes in distribution of each developmental stage are greatly influenced by seasonal current strength and direction. The principal food of S. intermedius in the field is algae. The efficiency of growth is expressed as the percentage of the energy consumed that is used for production or the percentage of energy absorbed that is converted into production. The somatic growth of S. intermedius is affected by the kind and quantity of marine algae.

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