Fold Toilet Safety Rail,Adjustable Toilet Safety Frame,Raised Toilet Seat Wheelchair ramp Stethscoper Co., Ltd. , http://www.youxin-adk.com
Ayu pollution-free pond breeding technology
Ayu is a kind of annual small-sized economic fish, which is a species of oystercatcher, aphanididae, and generally has an individual body weight of 100-150g and a maximum body weight of 300g or more. It is highly favored by consumers. At present, for the needs of the domestic and international markets, the development of pollution-free aroma fish culture, provide more high-quality aquaculture fish products, is the development direction of artificial aquaculture industry in the future. Now the pollution-free artificial breeding technology of ayu is introduced as follows: 1. Site Selection 1. Selection of Water Sources and Water Quality The source of aquaculture farms can choose mountain streams, reservoir waters, groundwater of rivers and lakes, etc., as well as fully collect the local hydrology and meteorology. Information on topography, soil quality, etc., combined with measures for aquaculture production and drainage in various seasons, will be used to determine whether the water supply is sufficient for use, especially if there is water shortage during the dry season. The water quality of aquaculture water must be tested by a qualified inspection unit in line with the standards of the "Fisheries Water Quality Standard" and "Water Quality of Non-polluted Food Freshwater Aquaculture Water (NY5051-2001)". 2. Choose the topography and ecological environment The breeding area should be selected in the water (territory) area where there is no industrial “three wastes†and agriculture, urban life, and medical waste pollution, and there is no pollution source that poses a threat to the environment of production areas upstream of the aquaculture water. Good quality, there is considerable water retention. The place where the earthen pond is built should avoid acidic soils as much as possible, and the terrain is conducive to drainage and flood resistance. It is a good ecological environment area with convenient transportation. Second, the pond construction 1, cement aquaculture pond is best for a round or oval cement pool, an area of ​​80-180?, depth 1.0-1.5m. The water inlet and drainage system of each cement pool should be independent, and the water inlet should be set above the cement floor, and the direction of the water inlet should be at a 45 degree angle to the tangent of the circular pool wall, so that the pool water can be concentrically circulated. There is no dead and colorful water flow, so that the water body It is fully utilized; the outlet is built in the heart of the ellipse, and when the water is drained, the feces and residual baits at the bottom of the pool can be concentrated at the outlet and discharged automatically with the water flow to keep the pool water fresh. 2. The setting of the drainage pipe The setting of the drainage pipe requires that all pool water be drained in about 30 minutes, and a fish-collecting facility should be constructed to capture the aquarium that flows out of the drainage stream. 3. In order to save costs and reduce production costs, the squid rearing pool should be reconstructed to make full use of the existing breeding grounds. However, there must be enough water for aquaculture and the quality of the source water should be tested. The old fish ponds must also be completely cleaned out to ensure the depth of the water level in the rearing ponds, resulting in lack of water, lack of oxygen, and even the occurrence of large numbers of dead fish. At the same time, it is necessary to allocate necessary oxygen enrichment equipment during the cultivation process. Ensure the full supply of oxygen. III. Disinfection of clear ponds 1. Before pond cleaning, pond inspection and maintenance ponds should be inspected for any cracks in the culture ponds, maintenance and drainage and aeration facilities, cleanup of debris in the ponds, and installation of a drainage network to prevent the escape of fish fry. 2. Pond disinfection The new culture ponds should be treated with 1.0-1.5ppm oxalic acid to remove alkali before use, and the water should be changed and washed for at least 20 days, and the pH of the pool water should be measured before use to test the effect after soaking. Seven days before seedling, they were disinfected with 20ppm potassium permanganate for three days and washed for use. The old aquaculture ponds and reconstructed turtle ponds were sprinkled with 200 ppm quick lime. After 3 days, they were soaked with 20 ppm potassium permanganate for 3 days. One day before the seedlings were released, they were filled with pond water and supplemented with oxygen, waiting for the seed to be released, and the "aquaculture production diary" was started. IV. Seed-feeding 1. Seed-free quarantine of sinus aquaculture pollution-free breeding, the breeding field introduced by its seed must comply with the provisions of the Fisheries Law of the People's Republic of China and the Regulations on the Management of Aquatic Saplings promulgated by the Ministry of Agriculture. The design shall comply with the requirements of the operating procedures for the production of aquatic fingerlings. The quality of seedlings shall comply with the relevant standards. Qualified aquatic quarantine personnel shall carry out quarantine according to the quarantine regulations (GB/T 158051-1995), and the quarantine fish Quarantine certificate issued. 2. The reasonable density of stocking density is the material basis for the maintenance of healthy fish culture. Generally, stocks with a length of 5-6 cm are preferred, ponds with a depth of 1.0-1.5 m are stocked with 30-50 tails. Because the growth of fish is affected by the culture density and feeding amount, short-term farms that require early sale and rapid growth must reduce their stocking densities. The general stocking density is 10-20 tails/day. 3. Stocking time The fry stocking time depends on the source of the seedlings. Generally, the natural seedlings can be stocked after being harvested in April-May, and the artificially-breeding fry can be stocked early in February-March. 5. Feed Feeding 1. Feed Requirements Feed is an important input in aquaculture production. The quality of feed is one of the most important factors affecting aquaculture efficiency and environmental ecological benefits. Low feed quality not only affects the normality of fish. It will grow, and it will produce a lot of waste during the breeding process, worsening the culture environment. The production of fragrant fish feed should be implemented in accordance with the "Regulations on the Administration of Feed and Feed Additives" promulgated by the State Council, and its quality should be in line with the "Safety Limits for Compound Feeds for Fishing" standard, and must not use feeds that are contaminated with mildew, spoilage, and pesticides or other harmful substances. The type and amount of drug additives used should be in accordance with the provisions of the "Standard for the Use of Feed Additives for Food Additives" of the Ministry of Agriculture and the requirements of NY5.72-2001. They must not use drugs that are banned from use by the state, nor can they be added to feed for a long time. Microbiological preparations can be properly added to the feed to make up for the lack of nutrients in the feed, improve the palatability of the feed to use the feed, promote the normal development and rapid growth of the ayu, and increase the immunity of the fish. 2. Feeding method The daily feeding amount is generally 4%-5% of the body weight of the fish. Each day of the feeding is 1/4 of the daily feeding amount, and the rest of the feed is fed several times, every 3-5 times. Increase the amount of feeding by 10% a day. The intake of ayu will be affected by many factors, such as the temperature of the water, the size of the aroma fish, the change of the quality, the change of the weather, and the condition of the aquarium. Therefore, the feed must support the “four determinations†when feeding. The principle is to make it possible for a sweet-fish to eat, without causing anorexia due to excessive feeding of fish. Sixth, patrol ponds must be performed every morning, evening, night and evening to observe the pool water quality, water temperature and ayu fish feeding and activities. Under normal circumstances, sweet fish appear to have "people with people" before feeding, and parades in the pool. It is very sensitive. If there is movement, it will disperse. The aquaculture water body produces odor, the oxygen blisters cause more blisters, and fish schools are not easy to spread. It is necessary to find out the reasons promptly and take appropriate measures to deal with them. In the hot season, if the pond water temperature approaches 20°C, cooling measures should be taken in time. After mid-September, the duration of sunshine is getting shorter. Shorter days can promote the sexual maturity of sweetfish. In particular, males become dark and thin, which reduces the product value of sweetfish. At this time, the lighting time should be extended, ie, it should be extended with fluorescent lamps at sunset. Sunshine is about 4 hours. When the individual's body weight reaches more than 100g, it can be marketed. 7. Water Injection, Sewage Discharge, Water Change 1, Water Injection In order to maintain the water quality and water temperature of aquaculture, it is necessary to maintain a water exchange rate of 0.3-2.0 times per hour. In aquaculture ponds with an area of ​​100 feet and a water depth of 1.0 meters, the necessary water flow is 9-50 L/s. When the water flow rate is low, the oxygen must be increased, and where the water exchange rate falls below 0.3 times/hour, the dissolved oxygen in the pool water must be replenished with a water truck, a vertical pump, and the like. 2. The large amount of excrement and residual bait of ayu fish in the sewage pool is often the cause of fish disease. Therefore, it is necessary to regularly discharge water and discharge pollutants to achieve a clean and tidy environment so as to reduce the occurrence of fish diseases. 3, change the water Under normal circumstances, at least one-third of the new water a day, the conditions permitting the best flow of water culture, the amount of water injection is better. VIII. Disease prevention and control The disease prevention and control adhere to the principle of “comprehensive prevention and active treatment†and emphasize the principle of “prevention from prevention, prevention from treatment, and combination of prevention and treatmentâ€. Maintain a good space environment, strictly abide by pollution-free environmental standards, regulate a good water quality environment, strengthen the management of water quality and water temperature, and regularly splash oxygen-containing fungicides, immune polysaccharides, dextran, probiotics and other immune enhancers, can improve fish Body immunity. It is forbidden to use high-toxicity, high-residue or fishery drugs with carcinogenicity, teratogenicity, and mutagenicity. It is forbidden to use fishery drugs that are severely damaged in the water environment and difficult to repair. It is strictly forbidden to directly use newly developed drugs as fishery drugs. The major or minor component of the drug used must comply with NY5071-2001 Guidelines for the use of fishery drugs. When using drugs, insist on accurately calculating the amount of water and the amount of medication, do not just increase the amount of medication, and pay attention to drug withdrawal period. The treatment of common diseases is as follows: 1. The symptoms of vibriosis are the diseased fish body surface, fin congestion, hemorrhage, scaling off, white silk, often accompanied by symptoms of gill rot. In juvenile fish, the mortality rate at the time of onset is higher than 50%. Disease prevention and control, can be prepared V. avium vaccine, diluted 10 times, soak the fry 2 minutes, the immune period of 60-100 days. 2. The symptoms of hepatorenal hemorrhage include diseased fish head, abdominal congestion, anal redness, hepatorenal hemorrhage, and large amount of death, mainly occurring in the high-temperature season from June to September. Disease prevention and control should be promptly taken to reduce temperature measures, reduce the amount of feeding, etc., or use chlorine disinfectant hanging bags, oral administration of fish liver Ning, multidimensional hormones and other treatment. 3, enteritis disease symptoms of the disease fish anal swelling, intestinal congestion, the majority of excreted feces float in the water, mainly in the high-temperature season from June to September. Disease prevention and control, in case of rainy weather and decreased water temperature, reduce the amount of feeding, when the condition is not heavy, stop eating for 1-2 days, the fish can be naturally restored. 4. The symptom of the head of the anchor head is the chest and the abdomen of the needle-like anchor head exposed outside the body of the fish on the surface of the diseased fish, and it mainly occurs in the cloakroom season from June to September. When the disease is prevented and treated, 0.5ppm crystal trichlorfon can be used to splash it once a day for two consecutive times.