<；P>；PROBLEM TO BE SOLVED: To provide a fish disease curative agent safely feeding given effective concentration of copper ions by a simple operation, without using any special and large-scale copper ion generator and/or any chemical agent needing troublesome operations. <；P>；SOLUTION: The fish disease curative agent comprises a granulated or molded form of the agent, characterized by containing a copper compound and organic acid(s). Prevention and treatment of fish diseases can be conducted by immersing the above curative agent in rearing water. In the above curative agent, the copper compound is preferably copper oxide, and the organic acid(s) to be used is one or a combination of two or more selected from citric acid, tartaric acid, ascorbic acid, lactic acid, malic acid, ethylenediaminetetraacetic acid, malonic acid and fumaric acid. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
