Two field investigations were executed to study relationship between port structures and marine organisms. The first investigation deals with the process of attachment of marine organisms (sessile animals, mobile animals and seaweeds) on concrete blocks in the sea. The blocks having several wall properties were prepared. For example, uneven type and sulfate of iron (FeSO4) coating type etc. Marine organisms,attached on the blocks which were set in the sea water for about 2 years, were studied from both qualitative and quantitative points of view related to marine ecology. The second investigation deals with the aquatic data collected by the Ministry of Transport. Relationship among two physical factors (waves and port structure type) and the quantity and quality of marine organisms was studied.
