水中溶氧的含量通常很低,只有百万分之几。水中有机物分解和生物呼吸、气压、盐度等许多因素,都对水中溶解氧产生影响。要想养好鱼,必须对水体中溶氧变化的规律有所了解。 (一)溶氧的来源 一是从空气中溶解氧。在静止状态下这种方式溶氧是非常缓慢的,而且仅仅限于表层。在一定的温度、高程(压力)等条件下,空气中的氧气溶解于水中的最大量称为氧的饱和浓度,其溶氧量和水量的百分比称为饱和度,也是水对氧的溶解度。如水温10℃时,纯水的溶解量是11.33毫克/升。它 Dissolved oxygen in water is usually very low, only a few parts per million. Water decomposition of organic matter and biological respiration, pressure, salinity and many other factors, all have an impact on dissolved oxygen in water. To raise a good fish, we must understand the law of dissolved oxygen changes in water. (A) the source of dissolved oxygen First, dissolved oxygen from the air. Dissolved oxygen is very slow at rest in this way and is limited to the surface only. Under certain temperature, elevation (pressure) and other conditions, the maximum amount of oxygen in air dissolved in water is called the saturated concentration of oxygen. The percentage of dissolved oxygen and water is called saturation and the solubility of water to oxygen. When the water temperature is 10 ℃, the dissolved amount of pure water is 11.33 mg / L. it