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精养鱼池在鱼类生长旺季，因投饵量大，排泄物和残饵增多，有机物经氧化分解所产生的含氮物质也随之增多。据测定，鱼池通常含有效氮在０．５－２．０ｍｇ／Ｌ，最高可达４．０ｍｇ／Ｌ以上。精养鱼池过量的氮元素常有６０％以上以总铵的形式存在，其中非离子态氨的毒性极大，
Intensive fish ponds in the fish growing season, due to the large amount of feeding, excrement and bait increased, organic matter generated by oxidation and decomposition of nitrogen-containing substances also will increase. It is determined that fish ponds usually contain available nitrogen at 0.5-2.0mg / L, up to 4.0mg / L or more. Intensive fish pond excess nitrogen often more than 60% in the form of total ammonium, non-ionic ammonia, which is extremely toxic,