Crab ecological disease prevention is achieved through the launch of live snails, planting and protection of aquatic plants, rational use of microecological agents, water quality regulation, and necessary disease prevention measures to achieve comprehensive prevention and control of river crab diseases, and promotion and application of crab ecology disease prevention technologies. , To enable farmers to achieve the purpose of bumper harvest, the main approach is as follows: I. Clearance and disinfection of Tongkou After the sale of fishery products in storage ponds from November to December was completed, the crab ponds were promptly cleared and cleared to remove excessive silt in the trenches. With lime or bleaching powder Quanchiposa, completely kill all kinds of pathogens, clear pond drug choice, to eliminate the use of sodium and other banned drugs such as sodium pentachlorophenol, can choose tea, lime, bleaching powder and so on. Second, the release of high-quality deduction crab The crabs are generally selected and entered into the pool with the specifications of 80-200 pieces/kg. The specifications are orderly, disease-free, injury-free and strong. The stocking generally ends in March, and the stocking density is between 400-600/mu. When it is put into the tank, it can be soaked in VC or Miaokangkang and put into the pool to enhance the physicality of the released crab species. Third, the reasonable use of snail In January-August, fresh snails can be put into the pond. If conditions permit, they can be fenced on board and set up areas to cultivate aquatic plants and snails. The amount to be put is 300~600kg/mu. In actual operation, it is necessary to In batches, it is recommended that the snails should not be put in too much before May, generally 200 kg/mu, so as not to cause excessive water quality, and the lack of oxygen in water causes the first and second shelling of the crabs. Shell phenomenon. IV. Planting and protection of aquatic plants As the saying goes, the size of crabs, watching aquatic plants, planting and protecting water plants, directly affect the living environment of river crabs, and the specifications of crabs out of pools. Planting good plants and protecting aquatic plants is an important measure for ecological disease prevention technology. At present, the general approach is to adopt Iraq. There are three species of waterweeds: Le, Algae, and Vallisneria. In the early period of the gully, Elodea was mainly planted to provide the pre-growth and shelling needs of the crabs. At the end of March, the plots generally consisted of species of Vallisneria. Algae, so that the pool to do more species of plants coexist, a reasonable distribution, water plants accounted for about 70% of the total crab pond area. During the aquaculture process, foreign matter such as sludge is easily attached to aquatic plants, which affects the photosynthesis of aquatic plants and reduces the ability of water plants to decompose harmful substances. Generally, appropriate methods such as fertilization and water supply of herbicides are used for treatment. V. Regulation of sediment quality, water quality and water level in ponds The regulation and control of pond bottom quality and water quality throughout the whole process of crab farming require overall early-stage fertilizer, medium-term clearance, and late-stage cooling in water quality control. In the culture process, the water quality requires a sense of sight, the water color is yellow-green, the water quality is clear, and the transparency is about 40cm. During the high temperature period, in addition to mastering the water color, we must also understand the main water quality parameters of the pond and require dissolved oxygen to be above 5mg/L. PH7 .5 ~ 8.5, ammonia nitrogen <0.1mg/L, nitrite nitrogen <0.05mg/L, in the breeding process, according to different water quality, different laboratory tests, take appropriate water quality adjustment methods. 1. In the adjustment of water quality, the most common method is to change the water in the pond. Don't change too much at one time when changing the water so as not to cause the emergency response of the river crab. Usually, the water is not changed more than 10% or water is added for 2 hours. . 2. Sprinkle quicklime regularly for pH adjustment. Supplement the calcium source in the pool, generally not more than 10kg/acre. 3. During the high temperature, according to different water quality regularly use microbial agents, commonly used microbial agents are photosynthetic bacteria, Bacillus, nitrifying bacteria, EM bacteria. 1 photosynthetic bacteria should be used when the water temperature above 20 °C, low temperature and rainy days should not be used. When used in a pond, every cubic metre of body is splashed with 2~5g of water and then sprinkled in the whole pond. When water is thin, it must be fertilized before using photosynthetic bacteria. This will help maintain the viability and reproductive advantages of photosynthetic bacteria in the water and reduce the cost of use. In addition, acidic water is not conducive to the growth of photosynthetic bacteria, should be sprinkled with a small amount of lime milk, PH value is adjusted to 7 or more before using photosynthetic bacteria. 2 Bacillus: Bacillus should be used as soon as possible when the aquaculture environment deteriorates and the algal phase is poor. Its rapid use of macromolecule organic materials can simultaneously mineralize organic minerals to produce organic salts to provide nutrition for single-celled algae. Single-cell algae photosynthesis also provides oxygen for the oxidation of organic materials, microbial respiration, and aquatic animals. A benign ecological cycle balances the algae in the pond. When using Bacillus, activation work as an essential measure, the activation method is: plus the pool of water and a small amount of brown sugar, soak 4 to 5 hours after the spill, splashing should be taken as much as possible oxygenation measures. (3) Nitrifying bacteria: When used, no activation treatment is required to expand the culture with brown sugar, etc. It is only necessary to dissolve the sprinkling with water. After putting in nitrifying bacteria, it usually takes 4 to 5 days to see obvious results. Therefore, advancement of the time is a good way to solve this problem. Nitrifying bacteria must not be used together with chemical oxygenating agents such as sodium carbonate or calcium peroxide. Since these substances decompose into oxygen atoms with strong oxidizing properties in the water, they will kill nitrifying bacteria. Therefore, use chemical oxygenation agents for 1 hour. After the use of nitrifying bacteria. 4EM bacteria: As a kind of effective microbial flora, the beneficial microorganisms that have been screened out are mixed and cultured with proper proportions and unique fermentation processes to form a composite microbial flora, which is formed by composite cultivation of photosynthetic bacteria, lactic acid bacteria, and yeast. The beneficial microorganisms in EM bacteria are decomposed and synthesized by nitrogen fixation, photosynthesis, etc. to make organic substances in water form nutrient elements for growth and reproduction of themselves and bait organisms, increase dissolved oxygen in water, and reduce harmful effects such as ammonia nitrogen and hydrogen sulfide. Material content, to achieve the purpose of purifying water quality. In the use of microbiological preparations, prevention should be the mainstay, long-term use, after the general microbial preparations are used, when the weather is good, it takes 2 to 3 days to begin to function, 7 to 10 days is the best, so the use of microbial preparations to regulate water quality, prevent water quality For the cultivation of bacterial diseases, it is generally necessary to adhere to the principle of “prevention first, prevention and control combinationâ€, and according to the actual situation, scientific selection of microbial preparations and the use of microbial agents during the period of best effect. While regulating the water quality, we must not neglect the regulation of the pool quality of the crab pool. The bottom quality modifier is often used to carry out bottom reforms on a regular basis so that the bottom mud will not be black and no smell will be emitted. The overall water level adjustment requires "shallow spring, summer deep, and autumn ground." Six, bait feed In the process of crab breeding, high quality foods should be used for feeding. The food should be increased or decreased according to the weather, water temperature, and feeding conditions of the crabs so that the crabs can eat and eat well. At the same time, it is not appropriate to feed too much, which causes the bottom of the crab pool. Deterioration of water quality, and to achieve "two fine, middle green." VII. Preventing Diseases and Preventing Hypoxia Diseases The principle of “prevention first, prevention and prevention of treatment†is adhered to, and attention is paid to the cultivation of pond water quality and the environment to ensure adequate dissolved oxygen in water bodies. This is the key to disease prevention. Use fertilization to cultivate water quality, use micro-ecological preparations to regulate the water quality, and use bottom-end drugs to regulate the quality of substratum. At the same time, water temperature at 18°C ​​in the first half of the year and water temperature at 25°C in the second half of the year should be disinfected once; Adhere to regular disinfection throughout the year, through the comprehensive control of biological, ecological and pharmaceutical, effectively prevent the occurrence of crab disease. Customized Led Road Stud,we offen said Solar Road Stud or solar road marker, is a kind of Road Stud, set along the road surface, used at night or in rainy and foggy weather, to indicate the direction of the road, composed of retroreflective material, shell, solar panel, LED, control device , A visual induction facility with active luminous and passive reflective properties, usually combined with markings. Customized Led Road Stud solar road stud lights,road stud reflectors,solar road stud lights,Garden solar Road Stud Shenzhen Wide Way Optoelectronics Co., Ltd. , https://www.wdmtrafficlight.com
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