1 试验方法与材料1.1 试验地点 2002年在山东省费县许家崖水库进行。该水库建于1958年10月,集雨面积580 Km2,总库容2.81亿m3,其中兴利库容1.67亿m3,可养鱼面积10 650亩,平均水深4.34 m,水质清澈,无污染。选择底质平坦,水深5 m左右的地方放置网箱。1.2 网箱制作 用适宜的聚乙烯网片(网目为2.5 cm)制成4m×4 m×2.5 m双层封闭网箱,按漂浮式固定。鱼种放养前 1 Test methods and materials 1.1 Test site 2002 Xu County, Shandong Province Xu Jiaya reservoir. Built in October 1958, the reservoir has a catchment area of ​​580 Km2 and a total storage capacity of 281 million m3, of which, the storage capacity is 167 million m3. The area of ​​10,650 mu of fish can be raised and the average water depth is 4.34 m. The water quality is clear and pollution-free. Select a flat substrate, water depth of about 5 m place cages. 1.2 Cage Production Appropriate polyethylene mesh (mesh 2.5 cm) made of 4m × 4 m × 2.5 m double closed cage, according to the floating fixed. Fish stocking before