(一)水质类型与形成条件1.瘦水水质。在生产中,瘦水水质往往会被养殖经验不足的人误认为清水、好水而被忽视。此水体水色清淡,呈浅绿色或淡黄色,透明度常大于30厘米,水体清瘦,浮游植物稀少,水色日周期性变化不明显。一般在新开挖的、底质保水性能差或滨海低洼盐碱土质的池塘,较易形成瘦水水质。 (A) Types of water quality and the formation of conditions 1. Thin water quality. In production, the quality of thin water tend to be mistaken for inexperienced people as clean water, good water and neglected. This aqua is light in color and is light green or yellowish with a transparency of more than 30 cm. The body of the water is thin and thin, and the phytoplankton is sparse. The periodic changes of the aqua day are not obvious. Generally in the newly excavated, the bottom of poor water retention properties or coastal low-lying saline-alkali soil ponds, easier to form a thin water quality.