Rice is the economically important crop. The addition of fish culture to rice production is an additional management consideration for farmers. In many cases, there may not be sufficient economic justification for this extra management. Fish culture in rice fields may be practiced at several management levels. In its most simple form, fish stocks are not managed.
Wild fish enter the paddy during flooding and are captured at the end of the rice growing season.
This method of raising fish together or concurrently with rice is as old as rice culture itself. Other techniques are based on either managed concurrent culture of fish with rice, or on rotational production of fish and rice crops. This manual discusses the concurrent production of rice and fish. Additional food and income in the form of fish. Control of mollusks and insects which are harmful to rice.