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.
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