Common diseases and prevention of grouper

Grouper is now a popular fish, with the hype in recent years, its market price is only increasing but not decreasing. Although grouper is a marine fish, freshwater culture can also be used, so there are more and more people raising grouper in freshwater. However, breeding grouper is not a simple thing, grouper will appear a lot of diseases, then grouper will produce what diseases? How to prevent and cure it? Let's have a look!

1. White spot disease

Disease characteristics: White spot disease is one of the most harmful diseases to grouper, which generally occurs in dense density and cage culture environment. The incidence of white spot disease is fast, and the ability of transmission is very strong. When the disease is serious, it will lead to the death of grouper in no more than 5 days. White spot disease is mainly caused by parasites, which will appear white plaques on the skin, fins and gills of grouper. The plaques will gradually expand, and finally all the plaques will be combined. Gill mucus increased, grouper can not breathe, sick fish can often be seen floating on the surface of the water.

Prevention and treatment: after confirming that it is white spot disease, put the diseased fish in clean fresh water for about 5 minutes, and certain pathogens can be eliminated. This is for mariculture. Freshwater aquaculture can use bleach or potassium permanganate solution to clean diseased fish.

2. Viral neuronecrosis

Characteristics of the disease: necrotic disease generally occurs on fish fry of 3-4 weeks, which begins to show no special performance after the disease, but the appetite decreases gradually and does not swim with the fish. But with the spread of the disease, sick fish will be like "dry ducks", unable to swim normally, as if eating too much become very big. Often lie on the surface of the water on his back, which is called "whitening" in the countryside. if you fish out the diseased fish, you will find that the head of the diseased fish is red and swollen, the abdomen is swollen, and the swim bladder will become bigger than usual, congested, red and swollen, and will usually die in about a week.

Prevention and treatment methods: necrotic disease is mainly prevention-based, in the purchase of seedlings should be carefully checked to avoid the choice of pathogens or disease species, should be burned immediately. When diseased fish are found, they should be fished out in time, raised separately from other fish, and disinfected the pond with bleach. When the temperature is high, it can reduce the culture density, ensure the quality of bait water, improve the nutrition of bait and enhance the resistance of fish.

3. White spot disease

Disease characteristics: no matter what kind of fish, the incidence of parasitic diseases is the highest, in which the threat of white spot disease is greater. When the diseased fish suffer from white spot disease, there will be various sizes of white spots on the surface of the fish. As the disease develops, the surface of the fish will become more and more mucus, the scales will begin to fall and swimming will be restricted. In general, the incidence is the highest in a high-temperature pond culture environment.

Prevention and control methods: the pond should be fully disinfected before the fish is released, and the culture density of the pond should be controlled and should not exceed the load of the pond. After discovering the disease, the diseased fish should be isolated in time and soaked in a mixture of glacial acetic acid and hydrogen peroxide for about an hour. And all the uninfected fish in the pond were soaked in formalin for about 60 minutes, about 3-5 days.

The above is a brief introduction of common diseases and control methods of cultured grouper, of course, not only these, such as gyration disease, ring disease and so on. Most of these are parasitic diseases, so it is necessary to do a good job of prevention. The incidence and transmission of parasitic diseases are much faster than traditional diseases, do a good job in daily management, reduce parasites, reduce the incidence of diseases. This article is for reference only. I hope it can help you.