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Biogas residues and biogas slurry cultivation techniques of local pond angle fish
First, the choice of fish pond construction address The local pond angle fish breeding, fish pond construction site selection is critical, the quality of fish pond conditions not only affect the daily management, but also affect the economic benefits of farming. The location of the fish pond should be selected from the front of the house with water source guarantee, good water quality and convenient irrigation and drainage, which is convenient for daily management. At the same time, the pond should be as close as possible to the orchard or planted crop to fully exert the function of the trapping lamp. Second, the technical aspects of fish pond construction 1, can be selected according to the terrain to build a pond or to build a pool on the ground. The digging type built pool is beneficial to the stable temperature of the water division winter insulation, which is conducive to the growth of fish, but there must be effective drainage conditions. The practice is to dig into the ground about 70 centimeters. The ground is about 50 centimeters high with bricks. The depth of the pool is about 1.2 meters. The practice of building pools on the ground is to build a pool of about 1.2 meters high on the ground with bricks. The area of ​​the fish pond is preferably 10-20 square meters, and its shape is generally rectangular. 2. The fish pond should have upper and no drainage openings. The upper drain is located about 25 to 30 cm away from the pool wall. It is used to prevent flooding in the rainy season. The fish in the pond corner flees with the water. The lower drain is used for changing the water daily and for catching fish. 3, the fish pond is better with brick structure, the wall of the pool, the bottom of the pool with a smooth cement mortar, do not leak, the water depth is about 0.9 meters, the bottom of the pool put a certain number of tiles, tile altar as artificial cave, for the pond corner Fish inhabit. Third, the fish pond disinfection before the release of fry, the pool to be sterilized, there are two methods, one dry pool method, put dry or drain pool water, after the sun exposure Kimchi evenly sprinkle quicklime, 75g per square meter area, the first One day into the new water, place 4-5 days and then change the new water, and then put 2-3 days after the release of fry; Second, with the water method, each cubic meter of water with 220g of lime, the calcined pulp heat the whole pool Sprinkle and start to fertilize the water after the toxicity of lime disappears. There are two ways to check the disappearance of toxicity of quicklime: (1) Check the PH value of the water in the pool. If the PH value drops below 7, it means that the toxicity of quicklime has disappeared; (2) There is anhydrous helium in the observation pool water. The toxicity has disappeared. Fourth, fertilization water quality After the fish pond is disinfected, about one week before the stocking of fry, begin to fertilize the water quality. After the injection of water reaches 0.9, the biogas residue can be used as the base fertilizer for the fish pond, and about 250 g of biogas residue is put into the fish pond per square meter. Fifth, stocking fish fry 6b fry should be no injury, disease-free, healthy and lively. Fish species should be more than 3 cm in size and be as consistent as possible to avoid killing each other. In the daily management work, disease prevention work is particularly important, and fish disinfection must be done when the fry is released. The method is to dilute 1 kg of salt with 30 kg of water and soak the fry in salt water for 5 minutes before placing the seedlings. Put a small amount of pool water into a container before putting the seedlings, and put a few fry into the test; if the fry can live normally within one day, you can put the fry in the pond. It is advisable to have a stocking time in the sunny days, and 50-100 tails of fish fry 3–5 cm long can be placed per square meter. 6. Feeding and Feeding Fish Ponds Pond fishes are mainly fed with commercial feeds, which are supplemented with biogas residue, biogas slurry and insect traps. The first feeding is to schedule regular feeds every day and feed them once in the morning and in the afternoon. The second is the quantitative measurement. Each feeding amount is preferably 3-4 hours after feeding, and the daily feeding amount is about 5% of the total weight of the fish in the pond. On this basis, the feeding condition of the weather and the fish is appropriate. Increase or decrease. Seven, biogas slurry, biogas residue fish culture technology Biogas fertilizer contains copper, iron, magnesium, manganese, zinc and other trace elements, also contains lysine, tryptophan, methionine, niacin and riboflavin, etc., used to make Feed fish, the effect is very good. Biogas fertilizers include biogas residue and biogas slurry. Biogas residue can be used as a base fertilizer for fish ponds, and can also be used as a top dressing. Biogas slurry can be used as a top dressing, and bath and biogas residue can be used interchangeably. The biogas residue is used as the base fertilizer for the fish pond. About 250 g of biogas residue can be put into a fish pond per square meter; as a topdressing fertilizer, water or biogas slurry is required to prepare a fertilizer solution with a solid content of 1%. The biogas slurry extracted from the biogas digester can be used directly, but the effect will be better if it is left for more than three hours. If the concentration of the biogas slurry containing solids is about 1%, it can be poured directly into the pond, usually once a week. The amount of biogas slurry per square meter does not exceed 500g. In terms of specific control, the time and amount of topdressing should be flexibly arranged according to the season, climate change and the quality of fish ponds. The main indicator is the transparency of water color. If the transparency of the water color is greater than 30 cm, it must be applied. If it is less than 20 cm, it is not suitable for top dressing. Each topdressing should be done on a sunny morning. Eight, the benefits of using biogas fertilizer to feed fish First, it can improve the nutritional conditions of fish ponds, promote the growth of plankton, and increase production of adult fish. Compared with the feeding of fresh pig manure into fish ponds, feeding of marsh fish can increase the yield by 19 to 33%; second, it can improve the ecological environment of fish ponds and increase dissolved oxygen in the water by 10-15%; third, it can reduce fish diseases. happened. Nine, timely change of water in the breeding process should often change the water, usually 10-15 days to replace one-third of the pool water is appropriate. To maintain good water quality, it is necessary to constantly observe the changes in the water quality of the pool. Generally, the water quality should be yellow-green. If it is found that the fry is out of the water surface, it means that the pond water is over-fertilized and the water is deprived of oxygen. The new water should be promptly injected and the old water should be drained. Especially in hot or thunderstorms, it is necessary to pay attention to the timely injection of new water and oxygen. Conditions can also be installed oxygen aerator to prevent dead fish. On the surface of the water, some water lettuces can be planted to help shade, prevent escape and regulate water quality. X. Prevention and treatment of ichthyosis fish horn fish breeding process, the most harmful is the viral rotten disease. The disease occurs more than one month after the fry stocking and when it weighs around 50g. The blisters appear on the surface of the diseased fish, the bases of the fins are congested, decay occurs, and severe systemic ulcers occur. At this time, a large number of dead fish will appear until the whole army is destroyed. Therefore, it is necessary to periodically splash the whole pool with quicklime, using 15g of lime per square meter for 15 days. If this disease occurs, most of them have no way to control the disease. This disease only uses regular medications in daily management and is mainly prevention. During the rearing period, common diseases include air bubbles, enteritis, echinococcosis, hydromycosis, black body disease, trichoderma and third-generation worms. In order to prevent fish diseases, foods such as bleaching powder and quicklime can often be used to disinfect foods. XI. Harvesting of adult fish The fish species reared with the above specifications and density should be fed in a suitable environment with good conditions in the pond. If the feed is adequate, the fish can be reared for 3-4 months. Each tail can grow to 100-150 grams. Product specifications can be harvested. When harvesting, the pool water is generally drained to capture. Before the water is dried, use a fish cage filled with feed or a pot of broken clay to put it in the pond and let the fish in the pond corners drill into it. Use this method to catch a part first, and then put it in the dry pool to catch it. After catching the fish, re-inject water into the pool and disinfect it. After fertilizing water quality, release the second batch. One year can be stocked and harvested 2-3 times.