Medicament for treating freshwater ichthyophthiriasis, preparation method and use method

The invention relates to a medicament for treating freshwater ichthyophthiriasis, a preparation method and a use method. The medicament comprises the following raw materials: glacial acetic acid, salicylic acid, dry red pepper, ginger, sodium chloride and the balance of water. The preparation method comprises the following steps: mixing the glacial acetic acid, the salicylic acid and the sodium chloride into water, stirring, and fully dissolving to prepare a glacial acetic acid-salicylic acid-sodium chloride pre-prepared water agent for later use; and homogenizing and crushing the dry red pepper and the ginger to prepare a paste mixture, adding the paste mixture into the pre-prepared water agent, fully mixing the paste mixture and the pre-prepared water agent, standing at room temperature,and filtering to obtain a water agent which is the medicament. For fishes which are infected with the freshwater ichthyophthiriasis and can normally eat, the medicament is sprayed to the fish schoolwhen baits are fed every d