1, dredging and weeding. In any shrimp pond that has raised shrimp for more than one year, due to the accumulation of residual bait and feces in the pond, the water in the pond becomes shallow and the toxic substances increase. Therefore, before releasing shrimp larvae, the shrimp pond must be dredged with high standards and high quality, and the dredging area should reach 100% to ensure the water depth in the pond is above 1.5 meters. Then use bleaching powder to "eliminate the wild".
2, grasping fertilizer and water to raise bait, and throwing seedlings in time. In late April, water was released into the shrimp pond to make the water depth reach 0.5 meters, and 2.5 kilograms of urea was applied per mu. Algae, rotifers, etc. in the pond multiply in large quantities to achieve the purpose of co-cultivation of basic bait with fertilizer and water. Around May 20th, a proper amount of seedlings should be planted, with 30,000 to 40,000 plants per mu, and healthy shrimp seedlings must be planted.
3. Master the regulation of water quality. In the early stage of shrimp culture, the number of water changes is less. When the transparency of the pool water drops to 1.5 cm ~ 20 cm, the water should be changed once, and the amount of water changed accounts for 1/2 of the pool water. In the middle period of culture, the water should be changed every 10 ~ 15 days, and the amount of water changed is 1/4 of the pool water. The method of changing water is to drain the bottom water first, and then add new water. It is necessary to prevent surface drainage. In shrimp culture with mixed water, the fresh water on the water surface should be drained in rainy season, so as to ensure that the salinity of the pool water is relatively stable.
4. Grasp reasonable feeding. Self-made push nets should be used to sample 50 to 100 prawns at 5 o'clock every morning, and the stomach and growth of prawns should be carefully observed. At the same time, the survival of shrimp in the pond was measured by rotating net, so as to know fairly well and feed it reasonably. In the late development stage, prawns were fed 6 times a day, once before sunrise, once after sunset, accounting for 40% of the daily feeding, and once every 4 hours at night, accounting for 60% of the daily feeding. The daily feeding amount is 80% around the pond and 20% on the beach. However, when the water temperature in the pool exceeds 30℃, the dissolved oxygen in the water is low, the water quality deteriorates, the fog atmosphere is low, and the new water is injected 1 hour.
5, grasp to prevent floating head. It is necessary to adhere to regular observation, strengthen water quality monitoring, improve disease prevention techniques, timely and accurately analyze and master water conditions, pond conditions, meteorology and shrimp conditions, so as to achieve early detection and prevention. When midges and small fish are found to be inclined, it shows that lack of oxygen in water is a precursor of shrimp floating head. At this time, it is necessary to enliven the water around the clock, or artificially make waves, oxygen, ice and oxygen. It is easy to lack oxygen in the middle of the night and can't be fed. It must not be found that the floating head stirs up sediment, which can only aggravate the death of prawns.
6. Catch shrimp, shellfish and fish for polyculture. Sticking to mixed culture of shrimp and shellfish and mixed culture of shrimp and fish not only greatly improves the pond area and feed utilization rate, but also reduces the cost of shrimp culture, which is beneficial to the development and growth of shrimp, increases the output of shrimp, prevents the floating head of shrimp from dying, and increases the benefit of shrimp pond.