Water quality regulation. High-yield pond with intensive culture using pellet feed. In general, there is more organic matter in aquaculture water. Can not use fertilizer to control the water quality of fish, but should do: insist on clearing pond with lime every year. The dosage should be 1.5 times that of the past, and adhere to no or less organic manure. When the water is lean in the spring and the transparency of the water body is large, nitrogen fertilizer and phosphorus fertilizer can be used to transfer water. In the summer when the water temperature is high, such as sudden changes in water quality, algae death, increased transparency of the water body. Can not use nitrogen fertilizer and water, but should be properly applied to improve the quality of drugs and a small amount of calcium dihydrogen phosphate. Combined water change and multi-aeration machine. Fish disease. On the one hand, stratification of aquaculture water bodies is severe under conditions of continuous high temperatures in summer. Convection stops at the upper and lower layers of the water body. The lower water body is in anoxic condition. Hypoxia decomposition of a variety of harmful substances generated. Nitrite or ammonia nitrogen content is high, easy to outbreak of various fish diseases. Therefore, it should be used to improve the water quality of environmental protection bottoms improved drugs and aerobic drugs. Add aerators during the day. Even an outbreak of fish disease must be treated with water and internal medicine. on the other hand. High temperature season can not be used to prevent fish disease. To prevent sudden changes in water quality and aggravate the condition. Should find out the cause. When the fish is fed with a small amount of drug dissolved in water, they are spilled near the feed table to form a medicated bath environment. Food sterilisation is supplemented by a combination of water treatment methods. Breeding density. The density of breeding should be scientific and reasonable. The pond self-purification capacity and the amount of organic pollution are basically balanced. Raise fish species as planned. The output setting depends on the conditions of the pond, the supporting conditions and the technical level. The general control is 800-1000 kg/mu. feed. High-quality feeds should be selected to increase the fish's own resistance. Reduce fish excretion and promote healthy growth of fish. on the one hand. Should choose the protein content is moderate, the amino acid balance is good, the processing technology is fine, the feed ratio is low the high quality feed; On the other hand, controls the good feeding amount. Daily intake of fish to 80% full. In the event of fish disease, one is to feed the bait. The second is to reduce the amount of feeding to 60%.
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