福寿螺的生长速度和繁殖力试验

Trails on the Growth Speed and Breeding Potential of Ampullaria gigas Spix

福寿螺在广州地区１年可发生３代，螺龄为２０～８０日，每只螺每１０天平均增重：一代０．９０ｇ，（２０．２～２７．６℃）；二代２．３８ｇ，（２６．４～３０．６℃）；三代０．１８ｇ，（１７．４～２５．７℃）。一代每只雌螺平均繁殖幼螺３０５０．１只，孵化率为７０．０８％，二代每只雌螺平均繁殖幼螺１０６８只，孵化率为５９．４％，１只雌螺经１年两代共繁殖幼螺３２．５万余只，繁殖力极强。

Ampullaria gigas Spix breed three generations a year in Guangzhou. Twenty to eighty dayold snails of different generations increased the average body weight per 10 days was as follows : A snail of first generation incerased 0. 9g under the temperature of 20. 2～27. 6℃ , in second generation, it was 2. 38g each snail under the temperature of 26. 4～30. 6℃, and that third generation increased 0. 18g under 17. 4 ～25. 7℃. The average number of breeding larvae of first generation per female snail was 3050. 1 and 70.08% eggs hatched. In second generation, they were 1068 and 59. 40%, respectively, The total number of breeding larvae of two generations per female snail was 325000 each year.