The pond requires a sufficient water source for the pond, good quality, and convenient drainage and drainage. The area is generally 3 to 5 mu. The pool pool should have a certain slope, and in order to avoid the escape of crayfish burrows, the pool pool width should be more than 1.5 meters, and around the pool floor is set to 0.5 meters high, the smooth wall of the escape or escape board. In the middle of the pond some loach was built to create a cave for crayfish. Note that the loach is not connected to the pond. The loach is about 4/5 of the pool length, 1 meter above the width, and 5 to 10 centimeters above the water surface. The depth of the pool should be 0.8 to 1.5 meters, preferably in the middle of the water, surrounded by shoals, and the roots, bamboo tubes, etc., should be placed at the bottom of the pool. Strictly sterilize before stocking, 300 to 500 kilograms of cooked manure per acre. In the pond, water plants that account for 30% of the pond area, such as Vallisneria, Hydrilla verticillata, Eichhornia crassipes, Water Lilies, Water Peanuts, etc., are convenient for crayfish to avoid hostile invasion and habitat during clam shelling. Juvenile larvae stocking mainly adopt three modes. The second is summer stocking. The first batch of juvenile shrimps hatched during the year was mainly stocked. The stocking time was in the middle or late July, and 3 to 40,000 juvenile shrimps with a size of 0.8 cm or more per acre were placed. The second is the stocking in the fall, with the largest size shrimp or shrimp species cultivated in the year, and the stocking time is from mid-August to September. About 1.2 cm of shrimp specifications, put 2.5 to 30,000 per acre. Shrimp species specifications 2.5 to 3 cm, put 1.5 to 20,000 per acre. The third is the winter and spring stocking, generally in December or March to April of the following year, with stocks that do not meet the market specifications of the current year, mainly shrimp, put 100 to 200 fish per kilogram per kilogram of 1.5 to 20,000, after winter and spring Two-season breeding, listed on the market from June to July. Juvenile prawns are required to have strong physique, complete appendages, no injury, disease-free, and strong activity, and the stocking specifications of the same pond should be the same. Before stocking, first put the juvenile shrimp into a plastic basin, slowly add a small amount of water to the basin until the water temperature in the basin is close to the pool water temperature, and add 3% to 4% of salt water to the bowl for disinfection for 5 minutes. Then slowly prawn into the pool along the edge of the pool. Take care to avoid exposure when stocking. If the shrimps returned from the field are returned to the market and the water is left for a long time, causing some shrimps to become coma, the juveniles should be kept in a basin for a period of 20 minutes before they are stocked again. The feed can be fed directly to ground minced fish, snail meat, silkworm cocoons, clams, slaughterhouse leftovers and rice bran, bean cake, bran, pumpkin, hawthorn and fresh water grass, etc., but also can be fed with shrimp feed, but To maintain the crude protein content of feed more than 25%. From July to October, the water temperature is appropriate. The growth of shrimp is in the season. At this time, the amount of shrimp fed is full, eaten, and no residual bait is taken. Generally, the animal's feed accounts for 8% to 12% of the shrimp's body weight. The feed or compound feed accounts for 3% to 5% of shrimp body weight. The feed was placed in the shallow water near the pool and fed twice a day, sooner or later, and the amount of feed at night was 60% to 70%. The rest of the season is fed once a day, before and after sunset, and the daily feeding amount is 2% to 5% of the shrimp body weight. Crayfish have poor swimming ability, a small range of activities, and an habit of occupying land, so feeding should adhere to timing, fixed-point, qualitative, quantitative. In addition, the feed must be paid attention to when the weather is fine, and more investment, high temperature hot, continuous rainy days or too heavy water quality is less cast; a large number of shrimp when the shell clams, after the clam shell more cast. Day-to-day management insists on taking a tour of the pond every day and discovers problems in a timely manner. Timely dressing, 1 week after the stocking of shrimps, 50 to 60 kg of cooked manure per acre, and 15 to 20 kg of fermented manure per mu in the middle and later half of the breeding period, keeping the water in the pool green or brown, transparency About 35 meters thick. Change the water frequently, change the water every 5 to 7 days in the hot season, change the water once every 15 to 20 days, change the water volume from 20% to 30% of the pool water every time, keep the pH value of the pool water at 7 Between ~9, dissolved oxygen is greater than 4 mg/L. Disinfect and improve the water body on a regular basis. Sprinkle lime with 10 to 15 kg of water per acre per day for 15 days. Quantitative spray of 0.5 to 0.6 g per cubic meter of water per month is sufficient to sputter the water in Quanchipia. In the middle and late aquaculture, 5-6 grams of photosynthetic bacteria per square meter of water per month and 40-60 grams of sediment improver will be splashed on the water to maintain a good water environment. Crawling listed crayfish grow faster, after 3 to 5 months of feeding, shrimp specifications reach 30 grams or more, Lang can be fishing listed. There are many fishing methods, such as shrimp cages, nets, pull nets or dry pools. The method of catching and catching large catches and catching small catches will not be able to keep the stock of the listed fishery. It should be noted that drugs should be used with caution before they are caught for disease prevention before catching, otherwise they will affect the crayfish catch rate, commercial shrimp quality and aquaculture efficiency.
Most Tattoo Needles(Tattoo Sterilized Needles) are made of some grade of stainless
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There are four main types of needle groupings. Some have one
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