Pond efficient ecological polyculture method suitable for grass carps, chubs, bighead carps, paddlefish and crucian carps

The invention belongs to the field of pond culture, and relates to a pond efficient ecological polyculture method suitable for grass carps, chubs, bighead carps, paddlefish and crucian carps. The method comprises the steps of: 1) filling fresh water after 1 week after preparation and disinfection of a pond and carrying out probationary culture of chub till the chub survives; 2) stocking 150g of grass carp, 100g of chub, 100g of bighead carp, 150g of paddlefish and 60g of crucian carp at one time, wherein the polyculture proportion is that grass carps account for 75%, chubs account for 8%, bighead carps account for 6%, paddlefish account for 6% and crucian carps account for 5%, and the average culture density is 3/sq.cm; 3) feeding twice a day, wherein the total feeding weight per day accounts for 5% of total weight of grass carps in the pond, the feed is polyculture fish seed particle matched feed, and the time of manual feeding begins from the time when the fish seeds are cast to 210 days; 4) adding 20cm of fresh water into the pond every week; maintaining the water quality at pH 7.5-8.5, temperature at 20.0-31.0 DEG C, nonionic ammonia smaller than or equal to 0.02mg/L, total alkalinity 1.00-2.00mmol/L, dissolved oxygen greater than or equal to 5.0mg/L, transparency 28-32cm, chemical oxygen consumption smaller than or equal to 15mg/L, biochemical oxygen demand smaller than or equal to 5mg/L and total escherichia coli smaller than 5000/L for 210 days. The average fish yield in the middle and lower reaches of the Yangtze River can reach 1000kg/667 sq.cm.