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ã€Pathogen】 Fish myxobacterial ã€Prevalence】 This disease can occur in grasses, green grasses, cockroaches, and other fish, but it is one of the most serious grass carp species. The disease occurs throughout the country in various fish farming areas. At temperatures below 15 degrees, it is generally rare. More than 20 degrees has become popular, 28-35 degrees is the most suitable for the popular temperature. In terms of seasons, winter is rare and common in spring, summer and autumn, especially in summer. It is often concurrent with enteritis.
[Symptoms and pathological changes] Diseased fish often swim alone, move slowly, loss of appetite or not eating, dark body color, especially the head has become dark, so the fisherman said the disease is "blackheads." Inspected by naked eyes, the diseased fish is rotted with sludge. The inner surface of the humerus is often congested, and the middle part of the epidermis is often corroded into a circular or irregular transparent window, commonly known as the “open skylightâ€. Remove the cocoon from the decayed part of the diseased fish gill and check under the microscope. Generally, the tip of the cocoon cartilage is exposed, and many mucus and sludge are attached, and many slender myxobacteria adhere to it. The lesions of orbital tissue are not inflamed and congested, but the cells in the affected area have different degrees of decay and collapse. Therefore, it is considered that the damage to the organism caused by the bacterial contamination may be caused by the disintegration enzyme in the bacterial metabolite in the cell tissue of the lesion area. Actively revitalizes cells, leading to cell death, collapse, and tissue rot.
[control methods]
1. In the early stage of disease, bleaching powder can be placed around the food field for prevention and treatment. When the disease is heavy, the whole pool of bleaching powder is sprinkled all the time to make the pool water into a concentration of 1 PPM.
2. Sprinkle erythromycin in the whole pool of poultry to make the concentration of 0.3 PPM of the pool water, and then use the powder mixture to feed orally the next day.
On the first day, 0.4 grams per 10 kilograms of fish was used, and the dose from the second day to the sixth day was reduced by half. The course of treatment was six consecutive days.
3. Sprinkle the whole pool with Chinese gallnut, so that the pool water becomes 1 - 4 PPM concentration.
4. About 20 kilograms of Pterocarya simonii per acre is used, and the entire pond is sprinkled with water after smashing.
5. Sprinkle lime throughout the pool to make the pool water at a concentration of 20 PPM.
Actively carry out prevention and control of fish gill disease
In order to ensure the healthy development of the aquaculture industry and the prevention and treatment of fish diseases, the Weiyuan County Aquatic Station is currently conducting a demonstration of the prevention and treatment of fish diseases.