Summer temperatures are high, which are conducive to the growth of aquatic animals, but at the same time they are also the key stages of multiple diseases, high mortality, and difficult management. How to overcome the unfavorable factors, do a good job in the management of pond culture and disease prevention, and improve the breeding efficiency are the issues most concerned to the farmers. Below, I will talk about the main points of pond aquaculture management in view of the unfavorable factors caused by high water temperature in summer.
Unfavorable factors: In summer, the water temperature is high, the water body is stratified with the temperature, and the bottom layer is low in dissolved oxygen and the water quality is easily deteriorated.
First, control the depth of the pond water, and control the pool water to 1.2-1.5 meters to promote the convection of the water from top to bottom, prevent stratification of pool water in the hot season, avoid the occurrence of anoxic zone at the bottom, reduce nitrite, ammonia nitrogen and hydrogen sulfide The production.
2. The aerators were opened at noon on a sunny day to promote the convection of the water body up and down, reduce the temperature of the surface water, make the dissolved oxygen in the water evenly distributed, and at the same time promote the decomposition of various harmful substances generated in the bottom or release it into the atmosphere, reducing the fish The hazards.
Third, when the water quality deteriorates, it indicates that the concentration of ammonia nitrogen or nitrite in the water is high. You can use the sediment modifier or light and bacteria to perform Quanchiposa to reduce the organic matter content and ammonia nitrogen, nitrite content of the water, and extend the use of Aerator time.
Second, unfavorable factors include: high water temperature in summer, lower digestive absorption rate of fish, slower fish growth rate, poor physiological metabolism, and decreased anti-stress ability.
1. For ponds with drainage conditions, the well water may be added to the pool before or after the noon aeration machine is opened. At the same time, the high temperature water in the upper layer shall be drained on the other side of the pond; water may be introduced into the pond without drainage conditions. The upper aquatic plants, such as gourds and duckweed, cover up to one-tenth of the water surface, and can both degrade the organic matter, ammonia nitrogen, and nitrite in the water and lower the water temperature.
Second, the feeding time is changed 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, reducing the energy consumption of fish and stress response.
Disadvantages 3: The summer fish have a large amount of food, and some low-quality or feed containing undesirable substances and hormones can seriously affect the breeding effect.
First, buy high-quality brand feed, can play a role in increasing nutrition, enhancing physical fitness, reducing the feed coefficient, reducing fish excretions, and improving the anti-stress ability of fish.
Second, no feed containing harmful substances and various hormones. Vitamin C is added to the feed, adding about 300 grams per ton of feed to protect the liver, enhance physical fitness, improve immunity and detoxification, and increase anti-stress and disease resistance.
Third, feed the amount of feed should not be too much, adhere to Bacheng full principle, in order to avoid excessive digestion caused by malabsorption and intestinal diseases.
Four unfavorable factors: high water temperature in summer, disinfectant drugs and insecticides have increased toxic effects on fish, and they can easily kill and kill fish and cause death.
First, the prevention and treatment of fish diseases in summer should be based on the regulation of water quality and the improvement of sediment quality. The use of drugs should also be based on environmental protection drugs that improve the environment and protect the environment. Adhere to the use of substrate improver or light and bacteria, water purification compound bacteria in June-September. In the regulation of water and fertilizers, fertilizers, fertilizers, water-based complex bacteria, and other algae nutrients are the main drugs.
Second, try to avoid the use of more toxic chemical drugs in disease prevention and treatment, it is appropriate to use environmentally-friendly finished drugs such as bacteria and algae nets.
Third, avoid the use of insecticide, disinfectant spilled together with the treatment of fish disease. Because in the summer when the water temperature is high, this treatment will not only damage the water quality, but also easily kill fish and cause death. Therefore, 1/5 to 1/6 of the dose of an acre should be taken, stir in the feeding area, and then feed the fish to the medicated bath. Severely increase the number of medications and allow the fish to take internal medicines.
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