Carassius auratus is the main breed, and some carnivorous fish, such as mandarin fish, snakehead (snakehead), California bass and catfish, are appropriately interplanted in the same pond. Using these fish, we can not only remove the small wild fish with low economic value in the pond and turn them into high-quality aquatic products, but also reduce the competition for food and oxygen for fish farming and improve the output of cultured fish. Generally, carnivorous fish 10-30 fish can be interplanted per mu of water surface. It should be noted that the specifications of carnivorous fish are smaller than those of main fish farming to ensure the safety of main fish farming.