Because of its thin shell, delicious taste, and rich nutrition, it has become a necessary dish on the table in recent years. The cultivation of white-tailed white-tailed shrimps in the fall is characterized by low cost, short cycle, easy management, and high profitability. It is more conducive to improving the utilization rate of shrimp ponds and enabling shrimp ponds in winter to fully utilize the benefits. According to the actual culture results of the Sanzhonggang Aquaculture Base in Binhai City, Jiangsu Province, it is generally possible to produce 1,490 kg of white prawn, which is equivalent to 41.2 yuan/kg, and the total output value can reach 50,000 yuan per 667 square meters. The production cost of shrimp, drugs, electricity, feed, and labor costs 0.9 million yuan, and the benefit is 6,100 yuan/667 square meters of water surface. The technical points are as follows:
Pond conditions: shrimp ponds after catching, water shortages need to be pumped into the pool, with an area of ​​3,000 to 6,000 square meters. Drainage and sluice gates are built, the bottom of the pond is flat, and the water outlet is inclined to drain outlets. The pond has an average water depth of 1.5 meters. The source of water is low salinity seawater with a salinity of 6.2 ‰.
Shrimp pond preparation: After the end of September, when shrimp is caught, 5 kg of bleaching powder will be disinfected every 667 square meters in the evening. After the disappearance of the medicinal properties, the water injection will start at 0.6 meters deep, and then the body will be disinfected with dibromohydantoin. The square meter uses 2.5 kg of urea and 0.5 kg of phosphate fertilizer to cultivate water.
Holding egg shrimp stocking: pond fertilizer water for a week, after the water quality fattening, in the middle of September to buy 13 kg of broodstock into the pond.
Water quality management: The key to hatching and cultivating shrimps is to adjust the water color, which is mainly to control the breeding trend of plankton populations. It is appropriate to use light yellowish green or light yellowish brown because it means that the water is dominated by benthic diatoms and is a shrimp. Seedlings like to eat food bait, the general transparent bottom control in about 30 cm, fertilization concentration control in each cubic meter of water body input 1 gram of nitrogen and 0.1 grams of phosphorus, dissolved after pouring, according to the color at any time after the top dressing, so diligently applied. . When the shrimp body is as long as 1.5 centimeters, it is gradually added water to gradually increase the water body. Second, the regulation of water quality during the growing season. Whenever the tidewater enters and drains once, the bottom sluice gate should be pumped out, so that the sewage flows out from the bottom, discharges 30 to 40 centimeters, and then the new water is injected to promote shelling.
Shrimp pond feeding: The shrimp stage depends on fertilizer to cultivate natural feed to solve the feed. When the average body length reaches 1.5 cm, it is not able to meet the feeding needs of white shrimp. Therefore, it is necessary to manually feed the bait, according to local conditions. In general, Penaeus vannamei feedstuffs are fed into the pool for spreading in the early stage, and should be uniformly fed on the beach stones along the pond every day. Every morning and afternoon, one piece is to be added each day. After the water temperature decreases, the amount of feeding or the amount of basic feeding should be reduced. Do not vote, generally above the water temperature of 5 °C, when the weather is fine, feed at noon.
Daily management: Adhere to the patrol inspection every day to observe the feeding of shrimps, growth of water color, gates, and gate nets. Take corresponding measures in time to ensure the safety of shrimp ponds and the healthy growth of white shrimp.
Precautions: Transport of brooding broodstock is a crucial step. It must be transported immediately after catching. Transport operations must be carried out gently to avoid dropping of shrimp eggs. Secondly, oxygenated transport must be performed. Otherwise, shrimp eggs will die due to lack of oxygen. Affect shrimp hatching rate. The cultivation of basic bait is the key to the survival rate of shrimp. Without suitable plankton as an open bait, the growth and development of shrimp will be delayed, and the size will be different, resulting in a low survival rate. In the autumn and winter, white shrimps are not only reused in the ponds, but also save the cost of rented ponds. In addition, the whole growing season is in autumn and winter, the water temperature is relatively low, and the number of open aerators is small, which saves electricity bills; secondly, the white tail shrimp can be fully utilized. Powdered feeds have relatively high relative utilization of feeds and low feed costs. Therefore, the overall production costs are relatively low and relatively high benefits can be obtained.
Medical Disposable Mask, Cup N95 Respirator, Antivirus N95 Respirator, Surgical Face Mask
GUANGZHOU HTD INTERNATIONAL , https://www.maskhtd.com