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近年来,随着养殖密度的不断加大,造成疾病的并发、混合感染,加大了用于疾病防治的药物投入,使管理成本上升,形成恶性循环。另外,大量药物的使用,往往没有考虑生态环境的影响,破坏水环境的自然平衡,使养殖水环境持续恶化。这种管理和生产模式与现代生态渔业和无公害水产生产严重
In recent years, as the breeding density continues to increase, causing the disease concurrent, mixed infections, increased investment in disease prevention and treatment, so that management costs rise, forming a vicious circle. In addition, the use of a large number of drugs, often do not take into account the impact of ecological environment, undermine the natural balance of water environment, aquaculture water environment continued to deteriorate. This mode of management and production is serious with the production of modern eco-fisheries and pollution-free aquaculture