Summer is not only a season of growing crabs and prawns, but also a season in which the weather is variable and water quality deteriorates. To make crab and shrimp safe in summer, we should pay attention to the following management techniques: Water transfer The transparency of the crab and shrimp mixed ponds is controlled at a water depth of 50 to 60 cm, a pH of 7 to 8, a dissolved oxygen of 4 mg or more, and a nitrite content of less than 0.02 mg per liter. Change water The number of water changes in the summer, the time, and the amount of water change are mainly based on water quality and weather conditions. Generally, the water is changed every 7 to 10 days, and the water is changed by about 20% each time. Fertilizer First, the summer generally 10 to 15 days a quick lime, according to 10 to 15 grams per cubic meter, after the application of quicklime 3 to 4 days, 2 to 2.5 kg per acre applied superphosphate, applied 1 to 2 times a month It can prevent the lack of phosphorus in the pool water and promote the growth of crab and shrimp. Second, regular use of biological agents (such as EM bacteria, super-concentrated composite bacillus) in the summer to regulate water quality, combined with oral administration, can avoid the use of disinfectants on the damage of the shrimp. The EM bacteria is used once every 10 to 15 days, and 250 g is used at a depth of 1 meter per acre. After heavy rain or windy weather, the water body is turbid and the transparency is reduced. Super-concentrated composite bacillus can be used to promote the sinking of suspended matter, decompose organic matter in the bottom layer of pool water, improve the transparency of pool water, and improve water quality and sediment quality. Oxygenation Green prawns require high dissolved oxygen in water bodies. Crabs also like fresh water with high dissolved oxygen in water. Therefore, they must be equipped with aeration equipment. The principle of opening the aerator is: open at noon on a sunny day, open in the early morning on cloudy days, open in the middle of a rainy night, open late in the evening, open early in the floating head, open without wind, open with less wind, open more at high temperatures, and open at low temperatures. Control grass In summer, the sunlight is strong and the aquatic plants grow vigorously. If the water grass covers an area that is too large, the water quality will be deteriorated, resulting in lack of oxygen in the pool water. It is advisable to cut away the excess weeds, and the aquatic weed area should be controlled at 40% to 50% of the pond area. Feeding Green prawns are mainly fed with compound feeds, focusing on the part of the oyster shell with some of the minced fish. Feeding time of shrimps: 7 to 8 am, 5 to 6 pm every morning, 30% of the daily feeding amount in the morning and 70% in the afternoon. In the morning, the bait is evenly thrown in the deeper water area around the pool, and it is put on the coast in the afternoon. Shallow water. Dense In the ponds where the main crabs are raised, the shrimps are mixed. The shrimps that are bred by the egg-bearing shrimps are all about 3 cm long. According to the density of the shrimps, the cages or dip nets can be used to catch large-size shrimps and the shrimps can be adjusted. Density reduces total biomass in the tank. Clean Wild miscellaneous fish compete with crabs and shrimps in the pool to compete for space and compete for oxygen. To reduce production costs and increase crab and shrimp specifications, it is necessary to control and clean wild miscellaneous fish. Normally pond water is filtered with a 60-mesh net. Disease prevention In July-August, depending on the pond water quality, the weather, etc., we use an insecticide to avoid the peaks of crab and shrimp clams. In continuous rainy weather, pay attention to disease prevention, and use Quanchiposa and oral administration methods. In the middle and late August, shrimp and crab enteritis should be prevented. Garlic (garlic mash, do not boil) should be used to mix the baits once a day for 3 days. The use of disinfectants for the control of other bacterial and viral diseases, such as dibromohydantoin, disinfectant bodies. We are a specialized manufacturers of Food And Beverage Additives from China;We support Moringa Leaf Powder,Taurine Powder,Fruit juice Powder,Vitamin Powder and so on. with advanced R & D and manufacturing in Beverage Additives. With high-quality products of Food Additives Raw Material, we can be a trust suppliers / factory. As a wholesale of Food And Beverage Additives, we have the perfect after-sales service and technical support. Look forward to your cooperation! Moringa Leaf Powder ,Taurine Powder,Fruit juice Powder,Vitamin Powder,Beverage Additives Xi'an Quanao Biotech Co., Ltd. , https://www.quanaobio.com