PROBLEM TO BE SOLVED: To provide a seaweed reef material made by reclaiming biomass full in every district and used so as to be sunk and settled on the sea floor. SOLUTION: This seaweed reef material is made by baking oyster shells at a high temperature at first, so as to form a quicklime-like material, then kneading the formed material, a soil-like material of a specific humic substance, a processing agent comprising rice bran/plum vinegar/rice hulls crushed at a low temperature, fly ash, and charcoal with a diluted solution of a specific humic substance extract, molding the kneaded mixture, and solidifying the molded material by hydration reaction, so that the molded material is finished as the seaweed reef material having an impregnation function of growing plankton. The seaweed reef material is sunk, settled, and fastened onto the sea floor by using a leg device which is composed of a plurality of legs, including legs made of a bamboo material, and a leg-spreading resistant plate and is positioned in a leg base part comprising a hole bored in the center of a structure of the material. COPYRIGHT: (C)2006,JPO&NCIPI
