PROBLEM TO BE SOLVED: To provide cultivation water or feeding water for underwater organism capable of disease prevention of infection by virus, bacterium, fungus, slime mold or microorganism without using toxic agent to cultivation water or feeding water for underwater organism, scarcely rots of seafood after catching, capable of extending expiration term and consumption term while keeping freshness and hardly causing food poisoning even when eaten.SOLUTION: There is provided disease prevention of infection by virus, bacterium, fungus, slime mold or microorganism during culturing or feeding of underwater organisms 8c to g and improvement and treatment of disorder by using antibacterial metal ion water 4a from which silver ion, zinc ion and copper ion are eluted as cultivation water or feeding water. There is further provided underwater organism growth ion water scarcely rots and extending expiration term and consumption term by containing antibacterial metal ion 5 in body fluid or cell tissue or the like after catching to make antibacterial seafood (ion body) having disinfection property, sterilization property and antibacterial property.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】水中生物の養殖水や飼育水に毒薬剤を使用せずにウイルス、細菌、真菌、粘菌や微生物による感染症の病気予防ができると共に、漁獲した後の魚介類が腐り難く、新鮮性を保って賞味期限と消費期限を延ばす事ができると共に、食べても食中毒になり難い水中生物の養殖水や飼育水の提供。【解決手段】銀イオン、亜鉛イオン、銅イオンが溶出した抗菌性金属イオン水4aを水中生物の養殖イオン水や飼育イオン水とすることにより、水中生物8c~gの養殖中や飼育時のウイルス、細菌、真菌、粘菌や微生物による感染症の病気予防と疾患の改善と治療。更に、漁獲後に体液や細胞組織等に抗菌性金属イオン5を含有させて殺菌性、除菌性、抗菌性がある抗菌魚介類(イオン体)にする事により、腐り難く賞味期限、消費期限を延ばす水中生物生育イオン水。【選択図】図3