| 摘要 |
PROBLEM TO BE SOLVED: To provide the subject member as an assembly of 2 types of steel materials different from each other in chemical composition, formed in a short time into an algae ground on which fish and shellfish grow in a coastal area, allowing the iron ions it contains to effectively elute out, capable of solving the algae blighting phenomenon in a short time, and useful as an excellent man-made gathering-place for fish and shellfish. SOLUTION: This iron ion supplying member is an assembly of 2 types of steel materials 1 and 2 different from each other in chemical composition, satisfying the formula [C]1+2[S]1) [C]2+2[S]2)>=0.10 ([C]1: carbon content of the steel material 1, [S]1: sulfur content of the steel material 1, [C]2: carbon content of the steel material 2, and [S]2: sulfur content of the steel material 2), and is obtained by bringing the steel materials 1 and 2 into electrically contact with each other. It is preferable to use the steel material 2 as the structural member which sustains strength and rigidity.
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