Nitrogen Budget and Management Measures of Freshwater Fine Culture Pond

In addition to oxygen, the most important impact facter on aquaculture was conversion efficiency of nitrogen． In China, pond culture was the highest proportion of aquaculture yield． Analyzing nitrogen budget of individuals or ponds and exploring ways to improve nitrogen conversion efficiency are of great significance for food security, agricultural product quality improvement, and environmental and ecological resource protection． General rules of nitrogen budget in intensive pond and fish, as well as production, transformation, harm and common treatment measures of ammonia nitrogen and nitrite nitrogen, were summarized． Problems and prospects of nitrogen management plan in pond were put forward．