After the beginning of autumn, the weather gradually cools. Although it is difficult to eliminate the heat, there is still the “fall tigerâ€. However, the overall trend is that the daily temperature difference is gradually obvious. It is often hot during the day and cooler at night. Autumn is a key season for aquaculture production management. If you are careless, it will cause major losses and even make any efforts. The following technologies and management measures are proposed: Water quality regulation: With the growth of farmed animals, the relative density of ponds will increase, and the residual baits, excrement, and old leaves of aquatic plants will rot. They will consume a lot of oxygen, and they will also produce toxic gases such as hydrogen sulfide. The accumulation of ammonia will increase and the pH will decrease. , Can easily cause floating head pan pool. Therefore, it is necessary to change the water in a timely manner, a small number of times, to absorb the water in the upper and middle, in order to increase the species of plankton, prevent and reduce the breeding of blue-green algae to form "blue lake water"; Second, to apply Bacillus, photosynthetic bacteria, nitrifying bacteria, Microbial agents such as EM bacteria liquid regulate water quality to reduce the damage to water caused by factors such as nitrite, ammonia nitrogen, hydrogen sulfide, and high pH. Autumn crab ponds should gradually increase the amount of water exchange, a small number of times, while entering the side row, to prevent the water level caused by high floatation and death, and every 10 days or so, spill lime, increase the pool water calcium, dosage 5 kg / mu . meters, keep the pool water PH value of 7.8 to 8.5, transparency 30 cm to 40 cm, conducive to thickening and hardening crab shells, promote healthy growth. Feeding: Feeding of conventional fish should improve feed quality. Daily feeds should be 5%-6% of fish's body weight. Animal feeds should account for 60% of feed. Daily feeds should be on the body weight of shrimps. 7%-8%; crabs increase the proportion of fodder feed, crab feed 65% animal feed, daily feed is 10% of the total weight of crabs. From the beginning of October onwards, as the water temperature declines, the amount of feeds will gradually decline, and the daily feed volume will drop to 3%, 4%, and 4%-5% of the total weight of fish, shrimp, and crab respectively. Another early autumn and mid-autumn period is the peak period of river crab feeding on plants and snails. We must pay close attention to ensure that crabs are used for food and eat, but also have a high amount of ponds. Insufficient ponds should take measures to make up water plants and snails. Turtle pond culture, into the fall of soft-shelled turtle breeding should be based on water quality control, good water quality, soft-shelled turtle food intake can be increased. It is suggested that farmers first use water purifiers to reduce the ammonia nitrogen and nitrous acid in the water at a faster rate, and after two days supplement the water transfer biological agents (such as photosynthetic bacteria, nitrifying bacteria, etc.), to expand the beneficial micro-organisms of the water body, and to make the aquaculture water body changeable. Good and keep stable for a long time. To ensure the quality of feed, in line with the turtle's demand for protein and fat, can be added in the feed 20% or less of fresh fish or high-quality chilled fish slurry fed, can greatly enhance the soft-shelled turtle feeding intensity, increase its growth rate and fullness . Due to the increase in the amount of soft-shelled turtles, adding drugs for the prevention of enteritis, such as andrographis paniculata, garlic, etc., are used for a few days for better results. Disease prevention and treatment: "Blooming out of the head, fish continue to die." Judging from the historical experience and practice of pond fish farming, fish disease will enter another popular peak season after the beginning of autumn. Therefore, to master the law of the occurrence of fish in the fall, and take the positive measures of “prevention without disease, early treatment with diseaseâ€, can we get a multiplier effect of prevention and control. It is recommended to adopt a combination of "elimination" and "internal treatment" to prevent the occurrence of diseases. Every 20 days or so, use Chlorine Dioxide and shrimp and crabs to disinfect the whole pool once. At the same time, detoxification, calcium, oxytetracycline and other drugs are added to the feed once a month. For ponds with poor water quality and reduced aquatic weeds, the “first killing after sterilization†method is used. The shrimp and crabs are used to net the fimbriae, the fish use the trichlorfon, the fish, shrimp and crabs are mixed with the fish and the nemesis, and the whole pool is splashed; Use chlorine preparations or iodine preparations Quanchiposa; three to five days later use quicklime 5 - 10kg / acre. Rice water Quanchiposa. In late autumn, when cold air arrives and temperatures drop, tropical breeding animals such as white prawn and Macrobrachium rosenbergii will be attacked by cold air, and preparations for listing and measures for keeping warm are needed. Strengthen the patrol ponds: stick to the morning and evening patrol ponds, check the activities of fish, shrimps and crabs, eat and eat, check the water color, transparency, and PH value, remove the rot grass and residual baits in time, and disinfect and clean the food field. For river crabs, soft-shelled turtles and other easy-to-escape aquaculture species, pay attention to see if there are any loopholes in the anti-escape setting and pools, check the inlet and outlet anti-escape facilities, and strengthen anti-theft inspections at night.
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