First, increase the amount of dissolved oxygen The demand for dissolved oxygen in shrimp is high, and its asphyxiation point is 1.1 mg/l.
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1. The power to be equipped with an aerator should reach 0.5 kW/mu, so that the dissolved oxygen in the water body should not be less than 5 mg/L.
2. Sediment is preferably 10 cm thick to remove excess silt from the pond. The organic fertilizer applied should be fully fermented and decomposed to reduce the organic oxygen consumption in the hot season.
3. It is advisable to cultivate a pond of polyculture fish with a yield of 150 kg of adult fish or fish.
4. Suitable for planting aquatic plants such as peanuts and water lettuce to increase dissolved oxygen in the water and control water body fatness; help cool shrimps and habitat.
5. Change the water once a week, each time changing the total water body 1/3, keep the water transparency in the high temperature season more than 40 cm.
Second, remove the enemy
1. When entering the water, use a 40-mesh and 60-mesh sieve to make a double-layer transition to prevent enemies from mixing in. The drain is installed with a dense mesh to prevent the shrimp from fleeing.
2. The juvenile shrimp stocking specifications should be the same, the ponds of the main cultured young shrimps can be mixed with a small amount of cod and trout, and the fish species should be placed when the juveniles have a body length of more than 2 cm.
3. Every 15 days, 20 kg of quicklime per acre is sprayed on the whole pond, which plays a role in sterilizing calcium and promoting the growth of the shrimp while regulating pH.
Third, reduce mutual disability
1. The shrimps tend to be weak in light, prefer to eat at night, and have mutual disability in the water with strong illumination. Therefore, in addition to aquatic plants such as water peanuts, small duckweed and floating sand, Elodea can also be planted, which can be shaded, and the leaves and roots of grass can also be eaten by the shrimp.
2. The feed protein content of shrimp is above 35%. Spring and summer shrimps are frequently clam shelled, and they can easily compete for food in the absence of feed. Can feed a suitable amount of cockroaches, cocoons, broken snails and so on. In addition, appropriate feeding should be carried out in early spring, late autumn and autumn to meet the feeding needs of the shrimp.
3. Often use dip nets and cages to catch large shrimps.
Author: Wannian Town Agricultural Technology Station, Haimen City, Jiangsu Province 