在同一口鱼塘中混养多种鱼类,是提高池塘养鱼产量的重要措施,也是池塘养鱼的显著特点。池塘养鱼的主要品种,生活习性各不相同,相对地可分为上层鱼、中下层鱼、底层鱼三类。上层鱼以摄食浮游生物的鲢、鳙鱼为代表,中下层鱼是草鱼、鳊、鲂等草食性鱼类,底层鱼则是鲮、鲤、鲫、青鱼等,在水底摄食有机碎屑,或底栖动物。将这些鱼类混养在同一口池塘里,一是可以充分利用池塘各水层,发挥立体生产潜力;二是全面合理利用池塘各种饲料资源,提 Reproduction of a variety of fish in the same ponds is an important measure to raise the fish production in ponds and is also a distinctive feature of pond fish culture. The main species of fish ponds, living habits vary, relatively can be divided into upper fish, middle and lower fish, the bottom three types of fish. The upper fish is mainly represented by the feeding of plankton carp and bighead carp. The middle and bottom fish are herbivorous fish such as grass carp, jackal, pomfret and the bottom fish are grubs, carps, crucian carp and black heron, Zoobenthos. The polygamy of these fish in the same pond, one can make full use of the pond water layer, play three-dimensional production potential; the second is a comprehensive and rational use of pond feed resources, mention