Causes and countermeasures of fish outbreak mortality

two。 Countermeasures of bacterial and parasitic diseases

For bacterial diseases, the main purpose is to control the reproduction of pathogenic bacteria in fish ponds and restrain the number of pathogenic bacteria within the order of incidence. This requires regular disinfection every 7 to 10 days with "Yujangjing", "Yujunjing No. 2", "bacterial enemy" or strong chlorine, to prevent the excessive reproduction of disease-causing bacteria. After the occurrence of bacterial diseases, disinfectants should be used for two consecutive times, and at the same time, drugs such as "Xueping", "Jingbo Tuoxueping", "Fish Disease Kang", "Yufubao" or "Jianyule" should be taken orally for 3-5 days as a course of treatment, which can effectively prevent the spread of fish bacterial diseases and promote the rehabilitation of fish. For parasitic diseases, in the high incidence season of parasitic diseases, drugs such as "insecticide" or "insecticide No. 2" can be used regularly to prevent parasitic diseases. After the occurrence of parasitic diseases, what kind of parasites are confirmed with a microscope, and then use appropriate insecticides to kill insects, and at the same time sprinkle disinfectants to disinfect the water to prevent secondary infection of bacteria.

3. Countermeasures for the influence of Nutrition and Metabolism

For fish ponds fed with pellet feed for a long time, some natural feed, such as aquatic plants, should be properly fed when possible, and pellet feed should be stopped for a period of time. At the same time, regularly mix and feed the drugs that protect the liver and protect the liver, strengthen the liver and benefit the gallbladder, such as "Gandankang", "Jianganbao", "Ganwei Le" and so on, the effect is better when used together with "aquatic special Vc", which can effectively prevent the occurrence of fatty liver and hepatobiliary syndrome.

4. Countermeasures for the influence of environmental factors on water quality

The death of fish is mainly due to the excessive content of ammonia nitrogen and nitrite. After 40-50 days of culture, these two indexes in the water body exceeded the standard in varying degrees, and when the pH was on the high side, it was easy to cause ammonia and nitrite poisoning and a large number of fish acute death. In the process of culture, microbial preparations such as "activating probiotics", "probiotics" and "EM bacteria" should be used regularly every 15 days. When the sediment of the pond deteriorates seriously, it can be combined with sediment modifiers such as "double-effect bottom clean", "multi-oxygen base modification king" and "bottom reform expert", which can greatly eliminate the content of ammonia nitrogen and nitrite in the water and maintain a good culture environment. Put an end to a large number of deaths of fish due to excessive levels of ammonia nitrogen and nitrite.

5. Countermeasures of poison poisoning

In the event of fish poisoning, it should be dealt with promptly and decisively, remove the poison quickly, and take measures for symptomatic treatment at the same time. When poisoning by disinfectants, pesticides or pesticides occurs, a large amount of water should be changed immediately, clean water sources should be introduced to make the fish out of the poisoning environment, and appropriate detoxification drugs should be used for neutralization and precipitation treatment to eliminate the residual toxic substances and prevent further absorption of poisons. At the same time, glucose, baking soda, "detoxification savior" and other drugs are used to relieve all kinds of functional disorders caused by poisoning, relieve poisoning symptoms and restore physiological function. For the poisons that have been absorbed by fish, it is necessary to choose appropriate drugs to try to reduce the concentration of poison in the blood and block the effect of poisons. for example, when organophosphorus poisoning occurs in fish, atropine can be used to eliminate the poison in fish. The death of fish caused by eating toxic substances is mainly caused by eating moldy pellet feed and leaching vegetable cake. this phenomenon focuses on prevention, as long as we ensure that the feed is fresh and do not feed moldy feed and leached vegetable cakes, there will be no food poisoning.

The author noticed that due to careless management, the phenomenon of sudden death of fish occurred from time to time in the process of culture, so that the harvest of farmers staged again and again, which is very distressing. In fact, the outbreak of fish death focuses on prevention, the emergence of bad signs should be dealt with in a timely manner. As long as the prevention work is done well and the management work is done in place, it should be able to minimize the chance of fish fulminant death.