PROBLEM TO BE SOLVED: To provide a cultivation material that can promote multiplication of underwater diatoms.SOLUTION: This is a cultivation material including calcium silicate for the purpose of supplying into water for multiplication of aquatic organisms. In the cultivation material, the elution amount of water-soluble SiO2 is 3 mg or more in the case where 1 g of the cultivation material is added to 1 liter of distilled water. The mass ratio of the total amount of elution amount of water-soluble CaO and water-soluble MgO to the elution amount of water-soluble SiO2 (the total of elution amount of water-soluble CaO and water-soluble MgO/elution amount of water-soluble SiO2) in the case where 1 g of the cultivation material is added to 1 liter of distilled water is desirably 10 or less.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】水中の珪藻の増殖をより促進させることができる養殖用資材を提供する。【解決手段】水棲生物の養殖用の水の中に供給するための、ケイ酸カルシウムを含む養殖用資材であって、蒸留水1リットルに対して養殖用資材を1gの量で添加した場合における水溶性SiO2の溶出量が、3mg以上である養殖用資材。蒸留水1リットルに対して上記養殖用資材を1gの量で添加した場合における水溶性CaO及び水溶性MgOの溶出量の合計量と水溶性SiO2の溶出量の質量比(水溶性CaO及び水溶性MgOの溶出量の合計量/水溶性SiO2の溶出量)は、好ましくは10以下である。【選択図】なし
