一、不对症下药　鱼体生病时要根据病鱼的症状、品种 ,大小、水质和饲养管理等多种情况进行准确诊断、对症下药 ,当病因不明时 ,切忌乱用药物。二、药量不准　全池用药时一定要准确计算用量 ,做到适量用药。如果药量过少 ,则起不到防病治病的效果 ,延误鱼病治疗 ;用量过多 ,则 First, the right medicine when the fish is sick, according to sick fish symptoms, breed, size, water quality and feeding and management and other conditions for accurate diagnosis of the right medicine, when the cause is unknown, should not indiscriminate use of drugs. Second, the amount of medication is not allowed Quanchi medication must be accurately calculated dosage, so that appropriate medication. If the dose is too small, it will not achieve the effect of preventing and curing diseases and delay the treatment of fish diseases. If the dosage is excessive,