If snails and loaches are mixed together, they can grow normally without feeding other feeds. Because snails can enrich plankton, protozoa, invertebrates and aquatic plants in water, such as rotifers, cladocera, copepods, chironomid larvae, networms and silkworms. It also produces young snails, which is a natural feed for loach, and the excrement discharged by loach is a good feed for snails. Snails not only eat loach feces, but also prey on benthic invertebrates and filaments in the water. Snail and loach are mixed, with snail 100~ 150 Jin and loach 15000~20000 pieces per mu. After 8~ 10 months, 3500~4000 kg of snail and 2000~2500 kg of loach can be harvested.