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Marine development projects frequently involve concepts for the construction of manmade islands. This is mainly with a view to optimizing use of space. The viability of these concepts depends not only on purely commercial questions but also on getting the agreement of local residents and people working in the fishing industry. The coastal environment affects the activity of marine organisms, and the primary wish of fisherman and local residents is "to make a habitat where marine organisms and creatures can live well." The Marilin system manmade island concept proposed here -based on notions contrasting with those prevalent hithertocreate an excellent environment for organisms by aplying the seawater movement mechanism found in the sea and the ecological mechanism of organisms living in seawater.Increasing the organism productivity in the sea around the manmade islands on the one hand, while at the same time providing a safe and pleasant space, both in the sea at the rear of the manmade island and on the shore, free from waves arriving from the open sea, can create effective national land space in coastal areas which has much wider uses than hitherto was the case. The present paper describes how a good environment for marine organisms can be created mainly be changing current movements of the sea.

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