Seven key points of fish farming in high temperature season
1.The breeding density should be scientific and reasonable, so that the self-purification capacity of the pond and the amount of organic matter pollution are basically balanced. Fish fingerlings should be stocked according to the planned output, and the output should be set according to the pond conditions, supporting conditions and technical level, and should be controlled at 700 kg to 1,000 kg per 667 square meters.
2.In the whole breeding process, choose high-quality feed, increase the resistance of the fish body, reduce fish excrement, and promote the healthy growth of fish. On the one hand, high-quality feed with moderate protein, good amino acid balance, excellent processing technology and low feed coefficient should be selected;
3.In the high temperature season, every 15 to 20 days, sprinkle 10 kg to 20 kg of quicklime per 667 square meters of water. First, it can adjust the pH value of the pool water, enhance the oxygen absorption capacity of the farmed fish, and improve the feeding capacity of the fish. and disease resistance; second, quicklime is sprinkled when adding water to heat, which can kill most parasites and bacteria. At the same time, quicklime has a short medicinal effect time, and has less side effects on the growth and reproduction of beneficial microorganisms; third, quicklime contains calcium, and after acting on the water body, it can supplement calcium fertilizer and promote the growth of phytoplankton.
4.During the peak season of fish growth from June to September, sprinkle or spray 3 kg to 3.5 kg of superphosphate every 667 square meters every 6 to 10 days, which can balance the nutrients in the aquaculture water and avoid the ammonia nitrogen in the aquaculture water. Too much ammonia nitrogen poisoning in fish. Especially in intensive fish ponds mainly fed with pellet feed, it is necessary to appropriately increase the amount of phosphate fertilizer applied in the aquaculture water. Because the crude protein content of the full-price feed is about 30%, while fish are stomachless animals, the utilization rate of crude protein is not high. . Therefore, the content of effective ammonia nitrogen in intensive fish ponds fed full-price pellet feed is much higher than that of intensive fish ponds fed with green feed and concentrate. After years of experiments, we have found that the application rate of phosphate fertilizer is 100 kg of superphosphate per 1 ton of full-price pelleted feed for intensive fish ponds that are fed full-price compound pellet feed.
5.In the main growing season of fish, the aerator should be turned on at noon on a sunny day. Through the rotation of the aerator, the thermal stratification of the aquaculture water is broken. The upper layer water with high dissolved oxygen is sent to the lower layer to reduce the oxygen consumption of the lower layer water and repay the oxygen debt in time. Although the oxygen content of the surface water is temporarily reduced, it can also generate oxygen through the photosynthesis of phytoplankton to saturate the dissolved oxygen in the upper water. Improve the oxygen content of the entire aquaculture water and reduce the production of toxic substances such as hydrogen sulfide, ammonia, nitrite, and organic acids.
6.The following treatment procedures should be taken for the occurrence of diseases in farmed fish in high temperature seasons: ① Water change: The method of changing the water is to first use a water pump to remove 1/4 of the old water, and then add new water. Because hydrogen sulfide, nitrite, organic acids and other toxic substances are mainly distributed in the bottom of the fish pond, pumping water can effectively reduce the number of toxic substances and bacteria in the pond. ②Every 667 square meters, use 10kg~20kg quicklime to evenly sprinkle the whole pool to kill most parasites and germs. ③ On the second day of splashing quicklime, 10 minutes before feeding the feed, dissolve a small amount of the drug in water and then sprinkle it around the feeder for two or three days.
7. In the high temperature season, apply Shuimei biological fish fertilizer two or three times a month to quickly eliminate harmful substances such as hydrogen sulfide, ammonia nitrogen and organic acids in the water body and improve the water quality. At the same time, the yeast and lactic acid bacteria in Shuimei fish fertilizer can form intestinal barrier in aquatic animals, inhibit the reproduction of bacteria, improve disease resistance, enhance immunity, and reduce morbidity and death.