In the process of aquaculture, various aquatic animal diseases have always been an important factor restricting aquaculture efficiency. In the current culture conditions, it is impossible to eradicate all pathogens. However, scientific management of fish breeding and maintaining the ecological balance of aquaculture water can improve the resistance of fish to reduce the incidence of fish disease.
1. Scientific selection of seedlings. To select high quality, pure seedlings, go to a regular and qualified nursery to purchase seedlings. To understand its mother's source, specifications, age of reproduction, etc. The high-quality varieties have fast growth, large market specifications and strong disease resistance.
2. Scientific stocking. Change the traditional stocking methods and change the spring to winter. In winter, the water temperature is low, and fishing, transportation and operation of fish species are not easy to damage the fish body. The species can be stocked early, adapt to the environment as early as possible, and eat as early as possible. After the spring water temperature rises, feeding is started immediately, so that the fish body can be quickly restored and the resistance of the fish body can be enhanced.
3. Reasonable polyculture. The reasonable polyculture of aquatic animals in the breeding process can make full use of the water body space, increase the yield per unit area of ​​the fish pond, and also have a good effect on disease prevention.
4. Scientific selection of feed. Select high-quality feed for fish, should go to the formal qualified reputable feed manufacturers to buy. Feeds must not contain hormones that are harmful to fish and humans. The feed must be fresh, complete in nutrients, free from pathogens, and not spoiled.
5. Adjust the water quality. Good water quality, high feed utilization rate, rapid growth of farmed fish, strong resistance, timely changing of water, scientific use of aerators, timely fertilization, and maintenance of water quality, livelihood, and coolness.
6. Strengthen management. During the aquaculture process, care must be taken to prevent the fish from being injured. During the middle and late breeding period, fish caught on the market at the appropriate time will be caught, the density in the pool will be reduced, and the feed will be fully utilized. At the same time, we must do a good job in environmental sanitation of fish ponds, diligently eliminate weeds from the pool, and diligently eliminate predators. Remove the bait and dead fish in time and clean and disinfect the food field regularly.
The virus is composed of a nucleic acid molecule (DNA or RNA) with a protein consisting of non-cell morphology of the campal life of the living body. The general symptoms of viral infection are fever, headache, cough and other symptoms of systemic poisoning and viral host and invasion of tissues and organs leading to inflammatory symptoms caused by local symptoms (diarrhea, rash, liver function damage, etc.). Different symptoms of the different virus, some viruses can also damage the myocardium, causing viral myocarditis. There are two types of viral infections, mostly recessive infections (subclinical infections), and a few are dominant infections. Dominant infection can be divided into acute infection and persistent infection. There are many ways of antiviral infection, such as direct inhibition or killing of viruses, interference with virus adsorption, prevent viruses from penetrating cells, inhibit viral biosynthesis, inhibit viral release or enhance host antivirus capabilities. At present, there are several major types of antiviral drugs: Anti-Respiratory virus infection drugs, anti-immune virus drugs, anti-hepatitis virus drugs, anti-herpes virus drugs.
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