大瓶螺（Ａｍｐｕｌｌａｒｉａｇｉｇａｓ）生长繁殖迅速，利用湖荡、水库、河沟进行网箱多级轮养可获得较高的产量。本试验依据多级轮养工艺流程，以６０天为一饲养周期，分螺苗，仔螺，幼螺和成螺四级调养；通过反复比较（净产量、出箱规格、成活率），得出各级网箱饲养的适宜放养密度：螺苗级３０～５０克（６０００～７０００只）／ｍ２；仔螺级２０００～２５００只／ｍ２；幼螺级５００～７００只／ｍ２；成螺彖１５０～２５０只／ｍ２。为便于推广应用，作者对养螺网箱的规格，网目大小，各级网箱间的面积之比提出了建议值。 Ampullariagagas grow rapidly and multiply, and the yield can be higher by multi-level rotation of cages with lakes, reservoirs and river ditches. The experiment based on multi-level rotation process, with 60 days for a feeding cycle, sub-Spirulina, snail, snail and Chengrui four-level regimen; through repeated comparison (net yield, box size, survival rate) The proper stocking density of the cages for feeding at all levels is 30-50 g (6000-7000) per square meter of spirochaete level, 2000-2500 / m2 of spirochaeta, 500-700 150 ~ 250 / m2. In order to facilitate the promotion and application, the author proposed the recommended value for the size of net cage, mesh size and area ratio between cage and cage at all levels.