1. Pond requirements: pond area 10-20 mu, water depth 2-2.5 meters, and silt thickness not more than 20 cm. Every 10 mu pond is equipped with 1 aerator and automatic bait feeder with power of 3kW.
Grass carp culture II. Pond cleaning: drain the pond water in winter and freeze it for more than 20 days. Clean and disinfect the pond with quicklime 150kg of water 10-20cm per mu/0/5 days before stocking fish.
3. Fish culture: Before and after the Spring Festival, 300 grass carp, 300 crucian carp, 50 silver carp, and bighead carp 15-20/kg were put into each mu. Soak the fingerlings in 5% salt solution for 5- 10 minutes before stocking.
4. Feed-feeding: Feed mainly granular feed with protein content of 28-32%, supplemented by turquoise feed. Feed feeding follows the principles of "coarse before fine" and "four fixed and four views". Generally, feed it twice a day, and it is advisable to eat grass carp 80% full within 2 hours. After feeding pellet feed continuously for a period of time, pellet feed should be stopped 1 week, and raw grain feed should be fed at intervals. Usually pay attention to adding vitamins and other drugs to the feed to avoid a large number of grass carp deaths due to diseases such as hepatobiliary syndrome.
5. Water quality management: use the aerator correctly, and start the aerator for 2 hours in the afternoon 1-3 every sunny day in June and June, and aerate in time in the early morning; Oxygen should be added early in continuous cloudy days. Inject fresh water into the pond at the right time, and gradually control the water quality by adopting the method of "small row and small inlet, and changing water for many times". From June to September, add fresh water 1 time every 3-5 days, add about 10cm of water each time, and sprinkle the mud with quicklime 1 time in the whole pool 10-20k g every 5-20 days.
6. Disease control: The grass carp hepatobiliary syndrome was controlled by the feeding method of "coarse first, fine second, fine and green". Common diseases of grass carp are erythroderma, gill rot and enteritis. Generally, oral administration is combined with external spraying, and external spraying is mainly based on disinfectants such as bleaching powder and chlorine dioxide, which lasts for 3 days. Oral "Sanhuang Powder" bait has better effect. Every 50 kilograms of fish, 0.3 kilograms of Sanhuang powder (50% rhubarb, 30% phellodendron bark and 20% scutellaria root, ground into powder and stirred evenly) is mixed into the batter and fed to the feed for 3-5 days.
7. Timely fishing: timely fishing of large-scale adult fish is an important measure for high-yield culture of grass carp. The main purpose is to reduce the fish carrying capacity of pond water and promote the rapid growth of pond fish in the later stage. Generally, 1 time will be caught at the end of July, and it will be caught in the early morning when the water temperature is low.