目前越来越多的水面使用化肥养鱼,因为鱼类特别是鲢需要的饵料——隐藻、裸甲藻等浮游植物的生长繁殖,需要丰富的氮、磷、钾等营养元素。大量事例说明:即使水体氮元素丰富,但如果磷元素缺乏和比例不协调,氮的作用也不能很好发挥。水体中磷元素丰富,不仅能促进隐藻、裸甲藻等浮游植物成为优势种群,而且还能借助浮游植物的光合作用,增加水中溶氧量,改善鱼池水质,促进鱼类的生 At present, more and more water uses chemical fertilizers to fish fish, because the fish, especially the silver carp needs the phytoplankton growth and reproduction, such as Cryptophyta and Gymnodinium, need rich nutrients such as nitrogen, phosphorus and potassium. A large number of examples show that even if nitrogen is abundant in water, the effect of nitrogen can not be well exerted if phosphorus is deficient and in an uncoordinated proportion. Phosphorus in water is rich, not only can promote the phytoplankton such as Cryptophyta and Gymnodinium dioica to become the dominant species, but also can increase the dissolved oxygen in the water by photosynthesis of phytoplankton, improve the water quality of fish pond and promote the growth of fish