白天鱼塘下风处由浮游植物产生的氧及从空气中溶入的氧总比上风处多,并且风力越大,上下处溶氧含量的差别越大。夜间则相反,因夜里鱼塘下风处浮游生物和有机物比上风处多,导致夜间耗氧量大,所以上风处溶氧比下风处多。合理调控鱼塘溶氧是保证养殖效益提升的关键。以下为调控溶氧的方法。 During the daytime, the oxygen produced by phytoplankton and the dissolved oxygen in the air from the fishpond windward are always more than the windward, and the greater the wind force, the greater the difference in dissolved oxygen content between the upper and lower reaches. At night, on the contrary, because at night fish pond leeward at plankton and organic matter more than the windward, leading to oxygen consumption at night, so windward office dissolved oxygen more than leeward. Rational control of dissolved oxygen in fish ponds is the key to ensure the efficiency of breeding. The following is the method of regulating dissolved oxygen.