Rice crop requires large amounts of water; Therefore, farmers in Indonesia devised a way to benefit from this water. They brought fish and released them in large numbers into the water in which rice was grown, and they gained three benefits:
Fish eat insects, algae, and harmful pests that collect on the soil, and fish feed on plant branches at the same time.The second benefit is benefiting from fish waste for soil fertility.The third benefit is that the fish itself grows and increases in reasonable quantities (as food for farmers or trade).
This movement was known as the "rice/fish culture". After implementing this plan, land production increased by about 20% above the normal limit, in addition to the huge quantities of fish