焦赛湖放养“人工蟹苗”的试验

Study of Stocking Effect of Artificial Breeding Mitten Crab,Eriocheir sinensis Megalopa in Jiaosai Lake

焦赛湖面积有200公顷,1990年4月26日投放人工半咸水繁殖的河蟹4公斤,翌年捕获成蟹872.42公斤,产值43867元,纯收入33859.24元,平均每公斤蟹苗产成蟹218.1公斤,获纯收入8464.81元,投入产出比为1:4.83。试验表明投放“人工蟹苗”经济效益显著。生长观察计算出雌蟹体重和背甲长的关系为:W-0.783L^(2.8787),雄蟹体重和背甲长的关系为:W=0.55L^(3.1337)。

4 kilograms of artificial breeded mitten crab megalopa with semi—salt water was stocked in a 200ha medium lake ,the output of commercial mitten crab is over 872. 42 kilograms. The ouptut value is 43867 Yuan,and net interest is 33859.24 Yuan . Ⅰ kilogram of mitten crab megalopa can produce 218. Ⅰ kilograms of commercial mitten crab, and the outpu value is 8464. 81Yuan. The imput and output ratio is 1:4.83。The economic efficiency is very significant. The relationship between the body weight and the carapace length of female and male mitten crab is W=0.783·L^(2.8787)and W=0.55· L^(3.1337)。