Polyculture mode for marine products

The invention discloses a polyculture mode for marine products. Traditional marine product culturing modes are culturing modes of single varieties, fodder needs to be cast in the culturing process, the utilization rate of net cages is low, and the culturing cost is high. According to the polyculture mode for the marine products, pearl oysters and seaweeds are cast in a net cage in which fishes are cultured, the fishes, the pearl oysters and the seaweeds are cultured in the net cage together, the cast quantity of the pearl oysters meets the standard that a pearl oyster layer with the thickness of 10-12 cm is formed at the bottom of the net cage, and the quantity ratio of the cast quantity of the seaweeds to the cast quantity of the fish is 10 kilograms : 100-300 pieces, and the seaweeds meet the standard that the carrageenan content reaches 25-60%, the seaweeds are suitable for growing in the environment with the seawater temperature of 25-33 DEG C and the seawater salinity of 1.018-1.025 baume degrees. The three different cultured varieties can form a food chain in benign circulation, so that fodder does not need to be cast in the whole culturing process; by means of the food chain in benign circulation, a culturing sea area is made to be clean and environmentally friendly, the water body is clean, pest and disease damage is not prone to occurring, the culturing cost is low, and benefits are obvious.