Abstract
Possible reduction of biological production in shallow coastal area due to reclamation by fly-ash produced from coal power plant will be estimated as large as 1, 650 ton dry weight/year per each one mega kw power plant. On the other hand, it will be enhanced net-primary production as large as 516, 000 ton dry weight/year after 30 years due to upwelling by constructing a sea-mount on continental shelf with fly-ash concrete blocks using all fly-ash produced, and, at the same time, above mentioned reduction of biological production can be avoided. After past research and develpment studies, fly-ash concrete block has now been qualified its persistence, safety, economical efficiency and so on for the requirement by the Fisheries Agency of Japan. An actual proof experiment constructing a sea-mount using 5, 000 fly-ash concrete blocks of 1.6 m cube is now being carried out in the vicinity of Kita-Matsuura of Nagasaki Prefecture by the financial support of total 1.2 billion yen from the Fishery Agency of Japan for 6 years since the fiscal year of 1995.
