1, dredging the whole pond. In winter, weeds and excessive silt at the bottom of the pond are removed, the pond is trimmed, and the bottom of the pond is exposed to the sun, so that the bottom of the pond is cracked.

2, disinfection and sterilization. About one month before sowing, the pond should be cleaned and disinfected with quicklime100-150kg, bleaching powder15-20kg or 50kg of tea seed cake per mu to kill germs, fish eggs and so on. The medicine for clearing the pond is especially quicklime.

3. The shrimp pond is flooded. When the medicinal properties of Qingtang medicine disappear, and before stocking 10 days, water can be fed. However, before the water enters the shrimp pond, it is necessary to observe whether there is filamentous algae in the pond. If there is, the advanced water in the pond is about 10 cm, and then the whole pond is splashed with Qingtaijing to kill filamentous algae. This can achieve better fertilizer and water effect. When entering the water, you must also do well:

A filter screen is arranged at the water inlet. The filter screen is made of 60 mesh nylon mesh cloth or nylon screen silk, and the length of the mesh is more than 2 meters, depending on the caliber of the water inlet pump.

Grasp the water inflow scale. 40-50 cm is suitable for the first water inflow, which is beneficial to fertilize and cultivate bait organisms, and then gradually increase the water level until the water level reaches 80-100 cm when stocking.

4. Cultivate bait organisms. Cultivating and breeding bait organisms (basic bait) in shrimp ponds is an effective measure to solve the palatable bait of shrimp seedlings after entering the ponds and accelerate the growth of shrimp, and it is also one of the effective ways to make full use of the natural productivity of shrimp ponds and reduce the cost of shrimp culture. Because of the advantages of rapid reproduction, simple and feasible culture method and obvious nutritional effect, basic bait organisms have become an indispensable production link in the culture process. Practice shows that if the basic bait is rich, the shrimp seedlings will survive and grow quickly after entering the pool. The method for fertilizing the shrimp pond is as follows:

Use organic fertilizer to fertilize water: the organic fertilizer used must be fully fermented, and the dosage depends on the environmental conditions at the bottom of the pond. Generally, the dosage per mu is about 25 kg, and the specific dosage depends on the fatness of the pond. But before use, it is best to mix with lime to kill insects and disinfect, so as to avoid pests.

Carbonammonia and phosphate fertilizer water: the dosage is about 20kg, and the ratio of carbonammonia to phosphate fertilizer is 3:1.

Compound organic fertilizer: such as special organic fertilizer for Penaeus vannamei. The dosage is 20-40 kg per mu, and the effect is faster and better when combined with compound fertilizer.

Other varieties: such as bio-fertilizer and active fertilizer and water agent available in the market.

Description: Generally speaking, organic fertilizer, chemical fertilizer, biological fertilizer, etc. are used organically, and the effect is the best. The specific dosage depends on the basic situation of the pond, the degree of fatness and thinness, and the water quality of the source.

After fertilization, the water color is yellow, green or brown, and the transparency is 30; 40 cm is better.

Water quality management

The water environment in shrimp ponds directly affects the growth and survival of Penaeus vannamei, and shrimp culture is water culture. If the water quality can be effectively managed and the living environment of shrimp is good, the shrimp will be healthy and grow rapidly. The pollutants in the water environment exceed the tolerance of prawns, which will cause poor growth and chronic poisoning, as well as reduced physiological function, induced diseases, abnormal activities and behaviors, poisoning death and so on. Therefore, water quality management plays a very important role in shrimp culture, and the quality of water quality is affected by water source, climate, aquatic organisms, residual bait and biological excreta. These effects are sometimes not only single, but also comprehensive. Therefore, we must pay attention to control each influencing factor to make the water quality stable and good, and promote the healthy growth of prawns. Do a good job:

1, control the water color: the ideal water color for Penaeus vannamei culture is yellow-green or tawny. In the early stage of aquaculture, the transparency is controlled between 30-40 cm, and it is controlled around 30 cm in the middle and late stage. Add fresh water every 7- 10 days, and it is better to use microbial agents every 10- 15 days to improve the water quality, reduce the organic biological content of water, and reduce the ammonia nitrogen, nitrite content and organic oxygen consumption.

2. Adjust the PH value: The most suitable PH value of Penaeus vannamei is 7.8-8.6, and the low pH value should be adjusted with quicklime, preferably not exceeding 9.0.

3. Improve the bottom material: With the growth of shrimp and the increase of feed, especially in the middle and late stage of Penaeus vannamei culture, the bottom environment is relatively poor, so it is necessary to improve the bottom material. If the water quality is too strong or too clear, the bottom environment is often poor, so it is necessary to put some substrate improvers to improve the bottom environment to reduce the adverse effects on Penaeus vannamei.

4. Pay attention to dissolved oxygen in ponds: In the process of culturing Penaeus vannamei, with the growth of shrimp, the demand for dissolved oxygen in water is increasing, so in the early stage of culture, the aerator is intermittently started according to the water quality. In the future, with the growth of shrimp, the startup time should be gradually extended to ensure that the dissolved oxygen in the pond is above 5 mg/L and the dissolved oxygen in the bottom of the pond is above 3 mg/L. When necessary, bottom oxygenator should be put in to increase the dissolved oxygen in the whole pond.

5. Start the aerator at the right time: within one month after seeding, usually start it for 2-3 hours on rainy days and when adding water, which can better cultivate good water quality; After one month, start the machine for 2-4 hours at noon and night on sunny days every day, and gradually extend the start-up time with the growth of shrimp. In rainy days, poor water quality and other weather, the start-up time should be extended or started 24 hours, which is beneficial to keep the water quality stable and good and prevent the white shrimp from floating head due to lack of oxygen.

6. Do a good job in water quality measurement: the main measurement indicators are PH value, dissolved oxygen, ammonia nitrogen, nitrite and transparency. Once a 1 indicator has problems, effective measures should be taken in time.