近年来，因蟹病的流行，严重制约了广大蟹农的养殖积极性，给河蟹养殖业带来了极大的损失。虽然河蟹养殖过程中应尽量避免用药，但随着养殖规模的发展，用药已成为必需。然而滥用药物，把药物作为防病、治病的唯一方法是极其危险的。首先，大多数原料药副作用大，毒性强，长期 In recent years, due to the prevalence of crab disease, severely restricted the enthusiasm of the majority of crab farming, crab farming has brought tremendous losses. Although the crab farming process should try to avoid medication, but with the development of breeding scale, medication has become necessary. However, drug abuse, the drug as the only way to prevent disease, cure is extremely dangerous. First of all, most of the API side effects, toxicity, long-term