Prevention and treatment of common diseases in black fish culture

Black fish is one of the common economic fish in China, which is deeply loved by people because of its large head, fast growth, high income, delicious meat and rich nutrition. The area of our culture is very large, but the phenomenon of being disturbed by diseases is becoming more and more serious. Below, the pro-agricultural net brings the prevention and treatment of common diseases of black fish.

1. Hemorrhagic disease

It is caused by a variety of bacteria and viruses, and bleeding stripes appear on the side of the fin and Gill at the time of the disease. with the development of the disease, the bleeding symptoms spread throughout the fish body, and the disease is very fast. A large number of deaths can occur in 3-4 days, and most of them break out in the period of high temperature from June to September.

Prevention and control methods: clear the pond and disinfect in winter, pay attention to the freshness of the bait when feeding, do not feed spoiled bait, if it is live bait, pay attention to disinfection before feeding. Strengthen water quality management, regular disinfection will change water, when the disease can be fed with Yufukang No. 2, according to the instructions, it can be cured in a week.

2. Red skin disease

Red skin disease is a disease infected by Trichoderma fluorescens. There are local bleeding symptoms on the body surface of black fish at the time of onset, and then bleeding and descaling phenomenon, resulting in inconvenient movement of black fish, reduced food intake, often floating on the surface. After losing the protection of scales, it is often infected with water mildew, which leads to death.

Prevention and treatment methods: usually strengthen the water quality management, sprinkle quicklime to clear the pond in time after the onset of the disease, inhibit the growth and reproduction of bacteria, disinfect and sterilize with disinfectants, and then add oral Yushikang to the bait and feed it according to the instructions, which can be cured in 3-5 days.

3. Water mildew

Water mildew is caused by infection of water mold in water. It can occur in all stages of the growth of black fish. It is not easy to detect in the early stage of infection. When the temperature rises to the point where it is suitable for growth, it will suddenly break out and begin to reproduce. It will spread all over the raw fish within a few days, and finally cause the fish to have white flocs. When the disease occurs, blood spots appear on the body surface of the fish, and their appetite weakens, and they gradually lose weight until they die.

Prevention and cure method: clean the pond with lime powder or bleach powder before stocking, pay attention to the culture density when raising, prevent the black fish from scraping when swimming, and facilitate the invasion of germs. soaking in salt water with lower concentration can kill the bacteria.

4. Rotifer disease

Rotifer is a parasitic disease caused by rotifer, mainly harms black fish fry, there is no obvious epidemic season, can occur in all seasons of the year. The incidence is higher in the environment of high temperature, poor water quality, high culture density and insufficient bait in summer. When the disease occurs, it becomes more mucus on the body surface, causing the fish body surface to be white, swimming slowly, gradually losing weight, and finally dying because of difficulty breathing.

Prevention and control methods: strengthen water quality management, sprinkle with the mixture of copper sulfate and ferrous sulfate, can effectively kill rotifers and control effectively.

The above are the prevention and control methods of common diseases in black fish culture brought by pro-farm nets, and these are the four common diseases of black fish. From its prevention and control methods, it can be seen that the quality of water quality determines the cause of its disease, so in culture, we must do a good job in the management of water quality.