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Astragalus cage culture and disease control
Prepare net cages before stocking: Culture cages are generally made of high-quality polyethylene mesh. It is generally 6 meters long, 2.5 meters wide and 1.3 meters high. Each cage is about 20 cubic meters. The cage size and mesh size depend on factors such as the size of the stocking seedlings, changes in water levels, and ease of operation. Site selection: The place where the cage is to be installed requires sufficient water, no pollution, no drought or flood disaster, and the density of the cage should not exceed two-thirds of the pond's aquaculture water, and the spacing should be limited to the medium-capable vessels that feed water into the cage. Depths between 50-80 cm. Use 6-8 roots to secure the upper and lower shelves of the cage. Decontamination ponds: After the cages are placed, the cages need to put some water grasses for the yellow toads, and then disinfect the pond waters to kill the harmful organisms in the ponds. After the cages have been soaked to grow algae and other attachments and their medicinal properties disappear, they can be stocked. This process is generally about 10-15 days before the clear pond to the next seedling. Strengthen the breeding and management of seed selection and stocking: suitable for cage culture of Astragalus should be drawn locally, the body surface is yellow, slender body, head slightly larger, more mucus, strong vitality. If you need to transport by short distance, you can only use natural-temperature pond water, so as to avoid stress response caused by seedlings due to too large temperature difference. Seedling collection and stocking time is generally conducted from April to June. The stocking density should be 0.8-1 kg per m3, 20-35 g per tail, and the seedlings in the lower box must be strictly selected to prevent disease and disease. Weak, injured seedlings were placed in boxes and the carcasses were sterilized with potassium permanganate or saline. After screening, the seedlings of different specifications are fed in separate boxes. A good grasp of aquaculture water environment: dissolved oxygen, water temperature, pH, inorganic salts and organic matter content in water will directly affect the growth and yield of seedlings. According to the reproductive characteristics and living habits of Astragalus membranaceus, the water area suitable for raising turtles generally has a pH of 7-7.5, a dissolved oxygen of 5 mecl, and a water temperature of 25-28 days. To meet the needs of growing foods: Astragalus is a food-active carnivorous fish. It mainly ingests zooplankton and aquatic insects in the water, and mainly adopts fresh live fish, shrimp, snail, quail meat and artificial compound feeds in cages. The half moon after seedlings are the key to affecting the survival rate. After the seedlings were placed in the lower boxes, the stress response increased due to the abrupt changes in habitat and stocking densities, and the decrease in mucus secretion caused by the skin decreased. External pathogenic microorganisms can easily lead to the death of ticks. Therefore, it is necessary to use the water inside the cage to control the body's surface mucus on the first day of seedlings' droppings. The next day after the next box, feed and domestication will be required. According to the local resources, live bait such as shrimp, quail, fresh fish, and oyster meat, which are eaten by the seedlings, shall be selected according to local resources, and the food attractant, antibacterial agent and Anti-stress nutrients, regular fixed-point lure, domestication concentrated feeding. Under normal circumstances, about ten days or so, food intake will return to normal. If the temperature is suitable, it can be fed twice a day. The feed must be fresh, so that the quality and quantity are guaranteed. For the rest of the feed to be fished in time, clear out of the cage, the amount of feed on the second day of feeding when there is no residue as a standard, general new live feeds account for 5 to 10% of carcass weight. In the early stage of the breeding, the feed is mainly fresh and live, and in the middle period, the artificial full-price compound feed is mainly used. In the later period, nutrition supplements are added to the live feed to complete the nutrient accumulation in the body and prepare for wintering. It is noteworthy that the cultivation entered the high summer season in midsummer, and the amount of excretion increased due to the increase in food intake. Water quality is easily deteriorated. New water should be replaced in time to improve water quality and create a favorable ecological environment for the growth of carp. Doing a good job of disease prevention and control Under normal circumstances, whether the incidence of jaundice can be determined from the food intake, body surface, habitat, and activity of Astragalus membranaceus. There are many reasons for the onset of jaundice. The deterioration of water quality caused by the feeding of large amounts of feed and the generation of harmful substances such as hydrogen sulfide is the main cause of morbidity. Because of the decomposition of organic matter, it is necessary to absorb a large amount of dissolved oxygen in the water and release harmful gases such as hydrogen sulfide and methane. The increase of ammonia nitrogen content often causes the floating head of Astragalus to die until poisoning. For the prevention and treatment of jaundice diseases, Wuhan Ruida Biomedical Technology Co., Ltd. has developed a series of drugs that play a very good role in the breeding practice. Water quality improvers include "sterilized clean water treasure", "detoxification change water treasure", "abuse of toxic water net". After these agents enter the water, they undergo hydrolysis and polymerization reactions, producing aluminum, potassium, silicon and other ions and a variety of multi-nuclear hydroxyl complexes, which can strongly adsorb and complex colloidal organic substances in the water, forming a separable after aggregation. Large-particle floc, which can purify the water body and the bottom of the cage, achieve the purpose of reducing ammonia nitrogen, sulfur dioxide, nitrite and complex harmful substances, and has a detoxifying effect on organic phosphorus drugs. Sterilization and disinfectants include: special squid for "Sickness", "Efficient Bacteria," "Quaternary ammonium complex iodine," "Special Pioneer." The comprehensive diseases caused by bacteria, fungi, and viruses can not only control the occurrence and spread of the disease in a timely manner, but also achieve the goal of healing the severe jaundice disease. Oral antibacterial and parasite agents include "Huangbi Electrolysis Multidimensional," "Blood, Blood Stop," "Digestion, Bao Gan Ning," "Fish, Kangtai," "Aphids, Net," and other nutraceuticals. The multidimensional compounded Chinese and Western medicines can prevent and treat the stress response caused by transportation and binning and mutations in the external environment and detoxify the deteriorating feeds; the "blood stop" treatment of fulminant hemorrhage and jaundice bleeding. Adhesion, enteritis, red fins and other diseases; "digestion Baoganning" for hepatobiliary syndrome, the use of Chinese herbal compound, with heat and detoxification, digestion and liver protection, regulate metabolism, promote growth, improve body immunity and other functions; "Insect net" can kill nematodes, aphids, spines, and hookworms in the intestine.