The high temperature in early autumn is beneficial to the growth of fish, but it is also a key stage of frequent disease, high mortality, and difficult management. At this stage, pond fish farming should focus on the following points:
Clear pond and fertilizer water From the analysis of a large number of cases in recent years, the main reason for the increase of fish diseases in the high temperature period in autumn is caused by excessive organic matter in the water body, resulting in poor water quality. To this end, we must persist in clearing the pond with lime each year, and insist on not using organic manure or less. 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 and autumn when the water temperature is high, such as sudden changes in water quality, algae deaths, and increased transparency of the water body, nitrogen fertilizers must not be used to fertilize the water. Appropriate application of improved substances and small amounts of calcium dihydrogen phosphate or photosynthetic bacteria, combined with water changes and more Open aerators to reduce the organic matter, ammonia, nitrogen, and nitrite levels in the water while prolonging the use of aerators.
To change traditional methods of governance in the prevention and treatment of fish diseases, the traditional approach is to adopt the “first killing, post-disinfection, early disease prevention, disease early treatment†method, in the case of high-density intensive cultivation and high temperatures in summer, this kind of The method is not only impractical, but also often leads to deterioration of water quality. Commonly used environmental-friendly amendments and aerobics are used to regulate water quality. During the day, aerators are added. Even if the outbreak of fish disease occurs, water must be used for treatment and internal medicine must be used to treat the disease. . In the high temperature season, fish diseases cannot be administered in large areas, so as to prevent sudden changes in water quality and aggravate the condition, the cause should be ascertained. When the fish is fed, appropriate amounts of drugs should be dissolved in the water and spilled near the feed table to form a “medicine bath†environment. The service is mainly based on disinfection of the food field, combined with the treatment of water transfer as well.
Aquaculture density should be scientific and reasonable Pond water quality is stable under the condition of organic matter pollution and self-purification capacity balance. When the breeding density increases, fish excrement increases, and when the amount of organic matter pollution exceeds the self-purification capacity of the pond, the water quality is unstable and extremely variable. Bad, more fish diseases. Therefore, the breeding density should be scientific and reasonable, so that the self-purification capacity of the pond and the organic pollution amount are basically balanced.
Choosing high-quality feed During the entire breeding process, good quality feed should be selected to increase the fish's own resistance, reduce fish excretion, and promote the healthy growth of fish. On the one hand, high-quality feeds with moderate protein content, well-balanced amino acids, and excellent processing techniques should be selected. On the other hand, the amount of feed should be well controlled, and fish should be fed up to 80% full daily. When a fish disease occurs, one is to feed the bait, and the other is to reduce the amount of feeding to 60%. No feed containing harmful substances and various hormones. Adding vitamin C to the feed increases about 300 grams per ton of feed, improving anti-stress and disease resistance.
Strengthen the anti-stress ability The water temperature is high in autumn, the digestion and absorption rate of the fish is reduced, the growth rate of the fish is slowed down, the physiological metabolism is poor, and the anti-stress ability is reduced. For ponds with drainage conditions, the well water can be added to the pool before or after the noon aeration machine is opened at noon, and the upper layer of high-temperature water is discharged on the other side of the pond; the water pond without access and drainage conditions can be introduced into the water hyacinth and floating. Ping and other aquatic plants, which cover one-tenth of the water surface, can both degrade the organic matter, ammonia, nitrogen, and nitrite in the water and lower the water temperature. Change the feeding time before 11 o'clock in the morning and after 4 o'clock in the afternoon to avoid the high temperature of the surface water at noon to reduce the energy consumption and stress response of the fish.
Grasp the prevention and treatment of common diseases Prevention and treatment of enteritis can be used 110-6 bleach or 30 to 50 kg of quicklime to water Quanchiposa; 10,000 fish per finger or 50 kg adult garlic head 250 grams, 200 grams of salt, feed 54 kilograms, preferably with dry noodles and in groups, feed for 1 week.
The epidemic season of gill disease (also known as Ukrainian headache) is from April to October, and the incidence is most severe from autumn to autumn. Use 110-6 bleach solution.
The control of grass carp hemorrhage can be rhubarb orally, per 10,000 fish or 50 kg of adult fish with rhubarb 0.5 ~ 0.75 kg mix 10 kg of flour and appropriate amount of bean cake, and then 4 pieces of virus Ling dissolved in water and feed, stir and slurry Add 50 grams of salt and continue feeding for 3 to 5 days.
Shenzhen Sunson Tech Co., Ltd , https://www.sunsonkiosk.com