Wu Langhu Rice fish culture is the best model of an artificial ecological system. Rice is predominant, but weeds, plankton, and saprophytic and photosynthetic bacteria compete with the rice plants for nutrients and diminish the environment. The introduction of fish into the ricefield creates a new link in the food chain that uses energy that would otherwise be lost and improves the function of the system and its economic efficiency.
Appropriate techniques make bumper harvests of rice and fish possible.
This model is suitable for most types of ricefields. It requires ample water resources. The number of ditches is determined by the size of the field. Rice plants on the ditches and the pit are transplanted near the ridge to form a fence or marginal row. All water inlets and outlets are fitted with screens to prevent the fish from escaping.