In recent years, the mode of polyculture of shrimps in ponds has been widely promoted, but some farmers have had a lot of stocks of shrimp in the process of shrimp aquaculture, but the yield is not high, and the survival rate is very low. How to improve the survival rate of shrimp culture, I believe that should focus on the following points:
Improve water quality and increase dissolved oxygen
1. The power to be equipped with aerators should reach 0.5 kilowatts/mu or use oxygen in the bottom pores to make the dissolved oxygen in the water not 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 raise the ponds of polyculture fish, and do not stock fish too much. It is advisable to produce 150 kg of adult fish or fish species per mu.
4. Properly grow aquatic plants such as peanuts and water lettuce to increase the amount of dissolved oxygen in the water and control the water body's fatness. This will help the shrimps to cool and inhabit.
5. Change the water once a week, each time changing the amount of water to 1/3 of the total body of water, keep the transparency of the pool water more than 40 cm in the hot season. Or use microbial strains such as photosynthetic bacteria, EM crude or Bacillus subtilis every 10 days for 15 days, combined with modified products to improve and regulate water quality
Reducing the disability of green shrimp
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. It is mainly fed whole-grain granule compound feed and requires protein content between 32% and 36%. 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. Frequently use sparse nets and cages to catch, fish, and catch small shrimps in order to reduce the amount of shrimp in ponds.
Clear the shrimp predators
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 is sprayed on the whole pond, and the pH value plays a role in killing calcium and promoting the growth of the shrimp.
Strengthen disease prevention
The prevention and control of shrimp disease should adhere to the principle of "prevention as the main and active treatment". Common diseases of crayfish are ciliate disease, gill disease (black shank disease), red body disease, and enteritis disease. According to different diseases, the disease is prescribed and treated in time. Green prawns are particularly sensitive to certain drugs and should be used with care. Strictly grasp the safe use concentration of the drug and adopt the correct method of drug use to ensure the healthy growth of the shrimp. The use of trichlorfon, phoxim, and chrysanthemum lipids is strictly prohibited.
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