Problem to be solved: to provide a fish production method for improving fish quality.The production method of this fish is to divide the part of the first rearing water of the rearing tank 2 for raising fish as the second rearing water into the filter vessel 3, to manufacture the third rearing water by irradiating the second raised water by the atmospheric pressure plasma to the third rearing water, and to mix the third breeding water into the first breeding water It is mixed with water and mixed with water. The process of mixing the third raised water into the first breeding water is repeated at predetermined time intervals.Diagram【課題】魚類の品質の向上を図った魚類の生産方法を提供する。【解決手段】この魚類の生産方法は、魚類を飼育する飼育槽2の第1の飼育水の一部を濾過槽3に第2の飼育水として分離する工程と、容器4にて第2の飼育水に大気圧プラズマを照射して第3の飼育水を製造する工程と、第3の飼育水を第1の飼育水に混合して混合飼育水とするとともに混合飼育水の中で魚類を飼育する工程と、を有する。また、第3の飼育水を第1の飼育水に混合する工程を一定の時間おきに繰り返す。【選択図】図1
