大瓶螺多级轮养放养密度的研究

Studies on Selecting Suitable Farming Density for Ampullaria gigas

依据多级轮养工艺流程 ,以 60天为一饲养周期 ,分螺苗、仔螺、中螺和成螺四级饲养 ,通过反复比较 (净产量、出池规格、成活率 )得出各级螺池饲养的适宜放养密度 ,螺苗级 ( 1 5～ 2 5g) 3 0 0 0～3 50 0只 m3 ;仔螺级 1 0 0 0～ 1 2 50只 m3 ;中螺级 50 0～ 70 0只 m3 ;成螺级 1 50～ 2 50只 m3 。

This experiment was conducted to select the suitable density for farming Ampullaria gigas .The farming cycle was as long as 60 days and the age of each individual was divided into four classes,named class Ⅰ,Ⅱ,Ⅲ and Ⅳ.The most productive farming density was 3 000～3 500 ind/m 3 for class Ⅰ,1 000～1 250 ind/m 3 for class Ⅱ, 500～700 ind/m 3 and 150～250 ind/m 3 for class Ⅲ and Ⅳ respectively.