Pathogens: The pathogens of the disease are Alcaligenes, Gram-negative bacilli, Brevibacterium. Another pathogen of perforation disease is Aeromonas, but also Gram-negative bacteria, spherical or club-shaped.
Symptoms: External symptoms: In addition to the morbidity of general infectious diseases, the special symptoms are punctate protrusions on the neck, armor, skirts, bases of the extremities, and the abdomen. After that, the protrusions gradually enlarge, protrude outward, and are swollen and swollen. After ulceration, the epidermis ruptured and the contents were pus-like and accompanied by a stench of odor. As the disease progressed, the contents became case-like (bean curd-like), with sores immersed in blood and slightly higher than the surrounding skin. Finally, the lesions expand, leaking out of the bones, rotting through the bones, and perforating. Corresponding to the perforation of the organ surface, manifested as inflammatory infiltration, the center dark red slightly black, gradually faded toward the surrounding red. By this time, most failures died. Internal symptoms: After anatomical examination, the body cavity of the diseased body has body fluids; the lungs are hyperemic and reddish purple; the liver is swollen, congested, purple-brown, with severe bleeding at the edges; the gallbladder is enlarged, there is no food in the intestine, and the intestines are red and congested.
Popularity: Perforation is an epidemic. Under normal temperature culture conditions, the epidemic time is generally from May to November; the peak incidence is from June to September, and from December to March of the following year, the disease is accompanied by hibernation. Under warming conditions, the disease occurs on an annual basis.
Prevention: The incidence of vitamin deficiency and feed corruption, adding vitamin E, to prevent feed oxidation, to prevent the disease have a certain effect. The water is planted with hollow grasses, water peanuts, and water lettuces, accounting for 20%~30% of the surface of the pool, and has a small amount of oysters, oysters, oysters, and oysters. Use quicklime and bleach (or strong chlorine) alternately for Quanchiposa. It not only mediates water quality, but also kills pathogenic bacteria in the water and cuts off the transmission of rickets. Feeding baits. Each 100 kg of earthworms were fed with 2 to 4 grams of oxytetracycline and 2 to 4 grams of norfloxacin. The sickness was isolated in time and was soaked with 2.5% saline for 10 minutes to 20 minutes. The original pool was splashed with quicklime and used once a day for 5 days. At the same time, feeding baits and using BaeKangkang No. 1 developed by Shanghai Fisheries University to feed for 1 week, can receive better results.
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