There are only 2 rice harvests per year so to increase your income you can combine different products such as fish, papaya, vegetables… You simply divide your land into different growing areas. Around the field you plant fruit trees or vegetables that you can sell in the market in order to get money to feed the fish. With a pond of 200 m² and 2 m depth you will raise about 3000 small fish and it will take only 1 month. After one month you free the fish in the paddy. Having fish in paddy increases the growth rate of fish as they find more food. It is a natural way to feed them. After 4 months you reduce water in the rice field which forces the fish back into the pond where they will finish growing for 1 month before being sold. These 3000 small fish will result in 1 ton of sellable fish and the income will be 12 million đ.