A feed additive for protecting or inhibiting free radical-induced diseases in fish is disclosed. The present invention also discloses a fish feed containing an anti-oxidant for protecting or inhibiting free radical-induced diseases in fish. The present invention also discloses a method for feeding fish.一種預防或抑制魚類自由基誘發疾病的飼料添加劑,其包括一抗氧化劑。本發明另揭露一種魚類飼料,其包括一預防或抑制魚類自由基誘發疾病的抗氧化劑。本發明亦揭露一種魚類飼養方法。