在防治鱼虾蟹等水产品病害中,由于我们长期、反复使用同一种药物或同一类药物而引起病原产生抗药性,治疗效果下降或无效,导致药物用量越来越大,防治次数越来越频繁,所用药物也越来越高档。长此以往,一方面可能会对水产品造成伤害,并可能引起某些疾病无法治疗,另一方面某些药物 In the prevention and treatment of aquatic diseases such as fish, shrimp and crabs, because of our long-term and repeated use of the same drug or the same type of drugs, the pathogen is resistant and the therapeutic effect is decreased or ineffective, which leads to the increasing dosage of drugs and the increasing number of preventions Frequent, the drugs used are more and more upscale. In the long run, on the one hand, aquatic products may be harmed and may cause some illnesses to be untreatable. On the other hand, certain drugs