Fish consume weeds and pests, prevent disease, conserve and increase fertilize, reduce or eliminate chemical pesticides, and as a result, also save farm labour. The decrease in the amount of agricultural chemicals also reduces chemical poisoning and environmental pollution. At the same time, natural pest predators such as praying mantis, spiders, and frogs correspondingly increase. In addition, because fish are predators of mosquito larvae and snails, they help prevent malaria, flariasis, and snail fever. Conclusion Agricultural production is being changed in Shanyou County.
Farmers now know how to use the limited arable land for multiple purposes.
There are several advantages to the new production system. First, the rice fish system increases economic benefits two or three times compared with a single rice crop. Third, the principles of a natural ecosystem are borrowed to promote ecological balance and ecological cycles. Fourth, cropping and fish-rearing are linked in a simple way that uses land, water, and biotic and abiotic resources efficiently and features low inputs, quick effects, and excellent benefits. Because fish-rearing in the ditch pond of a ricefield is a new production system, many items require further research.