Abstract
In Japan, where about 1/3 of fishery is imported from various foreign countries, techniques for increasing and nurturing fishery resources are required. In order to enhance productivity in the seas by Japan. This need a results from an increase in demand and coastal fishery restrictions in these foreign countries. And the development of optimal utilization of ocean space has also become necessary. Through marine observation, the authours be decided to evaluate changes in both the physical and biological environment by installing a structure in the sea. Further, we studied of the interaction between flow and biological environmrent by using numerical model.