It is difficult to raise the economic benefit of the ricefield by increasing rice yield. However, improved benefits and production values can be achieved by raising fish in ricefields. Economic benefits from different forms of fish culture in Sichuan in 1984. Average inputs per ha Avg. Net income of Qingcheng in Sichuan includes labour price.
Fish bring changes to rice cultivation and help achieve remarkable economic benefit.
These changes mainly decrease inputs into rice cultivation. The fish eat weeds that compete with rice for fertilizer. The fish also help control plant diseases and insect pests and, therefore, reduce the need for pesticides and the amount of labour needed for weeding. Rice fish culture improves labour productivity. Labour productivity is a measure of the total products produced in a certain period.