At coastal waters, seaweed beds provide nursery for fishes and food for shellfishes, but they are decreasing their habitat due to increased pollution of sea. Mitsubishi Heavy Industries, Ltd. and Shimizu Corporation have worked jointly to develop the system which cin provide sunlight undersea by tension-leg platform. The field tests are carried out over three years. The purpose of the field tests is to confirm the system working properly at sea and seaweeds grow well under the system. The tests gave satisfactory results and we can expect that the system will be one of the main unit of marine ranching system.
