施肥养鱼是实现鱼塘高产的主要措施之一。但施肥必须要讲究科学,才能更好地发挥肥料的作用。施肥不当,就会适得其反。夏秋高温季节,肥料中的有机质分解迅速,会消耗水中大量的溶氧,使水中缺氧,并产生硫化氢之类的有毒物质引起鱼类大批死亡。因此,鱼塘施肥前必须“三看”即看天、看水、看鱼。看天施肥:天气睛爽可以多施,阴雨天应少施,天气闷热或时雨时晴时应停施。因为天气好坏、气压高低,同水中溶氧密切相关。天气晴爽、气压高,则水中溶氧多,鱼塘可多施肥。相反,气压低,水中溶氧少,尤其是雷鸣 Fertilization of fish is one of the main measures to achieve high yield of fish ponds. But fertilization must pay attention to science, in order to better play the role of fertilizer. Improper fertilization will be counterproductive. Summer and autumn hot season, the rapid decomposition of organic matter in fertilizers, will consume a large amount of dissolved oxygen in water, the water hypoxia, and produce toxic substances such as hydrogen sulfide caused a large number of deaths. Therefore, before the fertilization of fish ponds must “look” to see the sky, see the water, watching the fish. To see the days of fertilization: cool eyes can be applied more weather, rainy days should be less applied, the weather was hot or when the rain should be stopped. Because of the weather is good or bad, the pressure level is closely related with dissolved oxygen in water. Sunny weather, high pressure, the water dissolved oxygen, fish ponds can be more fertilizers. On the contrary, low pressure, water dissolved oxygen, especially thunder