Although squid is generally used as a combination of regulating water quality and improving the transparency of water bodies, it occupies a small proportion and has a low selling price, but its death from disease must not be taken lightly. Because carp disease is often a "front stop" for other main fish diseases; carp deaths are often the "beginnings" of deaths of other main cultured fish. Herring hemolytic ascites is one of the typical examples.
Symptoms of the disease: When the condition is mild, the diseased fish body has a dark back, mouth, lid, and eyes are congested, and congestion on both sides of the fish body is not obvious. When the disease is serious, the fish body surface congestion is intensified, and pectoral fin base ulcers are eroded and perforated, and most of them are right pectoral fins. At the same time, the eyeballs protrude, the abdomen expands, and the anus is congested. Opening the lid of the diseased fish shows that the central endothelium of the humerus falls off and is similar to the "open skylight".
Cause of the disease: Poor water quality, excessive density, resulting in pathogen-producing single airborne bacteria, and thus cross-infection.
Epidemic season: The onset of the disease is longer, from late spring to early winter in northern Shandong. The most severe onset period is June to August when the water temperature is between 25°C and 32°C.
Disease hazard: Once the disease erupts, it will not only be difficult to treat the diseased fish but also have a high mortality rate. It will quickly infect other main cultured fish. The diseased fish that was transfected will soon be infected with other pathogens due to the decreased immunity. It will induce other bacterial diseases of the main fish culture, such as white skin disease, red skin disease, and enteritis disease. Sometimes manifested as complications; sometimes manifested as syndrome. It not only increases the difficulty of treatment and mortality, but also often causes unexpected explosive death.
Control methods:
1. Thoroughly clear the pond. Drain the pool water, use 130 to 150 kg of lime per acre to disinfect the sludge at the bottom of the pond. After the pond is filled with water, disinfect the pool water at a rate of 50 kg per mu per metre of water.
2. Disinfection of fingerlings. Before the fish species is under the pond, soak for about 15 minutes with 3%-5% saline or 10ppm-15ppm potassium permanganate solution to prevent exogenous infection.
3. Adjust water quality. Every 20 days during the epidemic season, the pond is replaced with 15 to 20 centimeters of fresh water to ensure reasonable water clarity. Every half a mu of water per metre of rice uses 15 kg of lime to sprinkling the entire pool.
4. Once it is found that the carp is sick, it must not be paralyzed, and immediately treat the disease and actively treat it. External chlorine dioxide Quanchiposa, so that the pool water was 2ppm, once every other day, used three times; oral allicin for a week. In this way, the method of combining oral administration of drugs to prevent fish-eating infections and external use of drugs to treat diseased fish is effective.
Precautions: Fish ponds infected with hemolytic ascites should not be re-fed with new water and nets, as the disease can easily stress the fish and aggravate death.
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