1, pond area10 ~ 20mu, water depth 2 ~ 2.5m, and silt thickness not more than 20cm. Every 10 mu pond is equipped with 1 aerator and automatic bait feeder with power of 3kW;

2. Drain the pool water in winter and freeze it for more than 20 days. Clean and disinfect the pond with quicklime 150kg per mu on the water surface/kloc-0 ~ 20cm before stocking fish;

3. Before and after the Spring Festival, put 300 grass carp, 300 crucian carp, 50 silver carp and 0/5-20 bighead carp/kloc/kg per mu. Soak and disinfect the fingerlings with 5% salt solution for 5 ~ 10 minutes before stocking;

4. The feed is 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.

5. Water quality management: use the aerator correctly, start the aerator for 2 hours every afternoon 1 ~ 3 in sunny and windless days from June to 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 water about 10cm each time, and sprinkle quicklime 1 time in the whole pool 10-20k g mud every120 days;

6. Feed grass carp with the method of "coarse before fine, green before fine" to control the occurrence of hepatobiliary syndrome. 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 kg of fish weight, 0.3 kg of Sanhuang powder (50% rhubarb, 30% phellodendron bark and 20% scutellaria root, ground into powder and stirred evenly) was mixed into the batter and fed to the feed for 3-5 days.

7. Catching and selling large-scale adult fish in time 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.

Ecological habits of grass carp

Generally, I like to live in the middle, lower and inshore areas where there are many aquatic plants in rivers, lakes and other waters. Mature individuals, which has the habit of river and lake migration, lays eggs in flowing water such as rivers and reservoirs. After spawning, parent fish and juvenile fish enter tributaries and Tongjiang lakes, and usually feed and fatten in submerged shoal grassland and submerged areas and water bodies attached to main tributaries (lakes, rivers, harbors and other water-covered areas). Overwintering in the deep water of the main stream or lake in winter. Grass carp is a typical herbivorous fish, with lively temperament, fast swimming speed, often foraging in groups and gluttony. The larvae feed on zooplankton, while the larvae feed on insects, earthworms, algae and duckweeds. When the body length is about 10 cm, they feed entirely on aquatic higher plants, especially Gramineae plants. The species of plants eaten by grass carp vary according to the food base in the living environment.