To provide an aquaculture system that prevents seawater from being contaminated and various germs from being propagated, by the bait remaining behind and the excreta discharged by the breeding marine life, etc., while maintaining a stable breeding environment without carelessly casting substances such as antibiotic or the chlorine into an aquaculture tank.SOLUTION: A raw material containing a silicon dioxide and an aluminum oxide at a predetermined ratio is made to melt at a temperature of 1600-1750°C, and a compound of the silicon dioxide and the aluminum oxide is generated. A rock-shaped block obtained by cooling the compound is finely crushed to obtain a powdered cohesive material, and an impurity cohesive block configured by multiple fine cavities is generated. The impurity cohesive block is coated by using a colloidal solution of the compound obtained from the powdered cohesive material, and thereby the cohesive force is improved. Then, bacteria are fixed in the impurity cohesive block and the cohesive impurities are decomposed, and thereby an aquaculture system for breeding marine life, etc., is provided while maintaining a stable breeding environment.SELECTED DRAWING: Figure 1
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