稻田养鱼是以稻鱼共生为基础的,因此选好鱼种和最佳的放养密度是成功高产的关键。据日本福冈水产研究所的研究和实践表明,鱼种应选择体质健康、无病无伤的鲤科鱼类为最好。放养密度为:水深30cm左右时,450～500尾/hm2,鱼苗体重为75～100g/尾;稻田水深35～50cm时,500～600尾/hm2, Paddy fish farming is based on the symbiosis of rice and fish, so choosing the best fish species and stocking density is the key to successful high yield. According to the research and practice of the Fukuoka Institute of Fisheries in Japan, it is suggested that the species of fish should be healthy, disease-free and harmless, and the carps should be the best. The stocking density was 450 ~ 500 / hm2 when the depth was about 30cm and the body weight was 75 ~ 100g / tail. When the water depth was 35 ~ 50cm in the paddy field, 500 ~ 600 / hm2,