Aoni fish common disease prevention
Aoni is a hybrid obtained from the crossing of Oreochromis niloticus with Nile tilapia. It has a high male rate, rapid growth rate, high population yield, and strong disease resistance. However, because it is a tropical fish, during the pre- and post-overwintering periods, if the relevant conditions such as water temperature, water quality, and feeding are poor, it is easy to induce a variety of diseases, which has a great impact on aquaculture operations. The prevention and control methods of common diseases are briefly described as follows: Causes of water mould: Occurring in the low water temperature season below 20°C. During the overwintering period, Onyx fish lost its scales due to damage to the fish, resulting in the invasion of water mold, rapid reproduction at the wounds and lesions, and the growth of many cotton-like hyphae. The diseased fish is restless, swimming is slow, appetite is diminished, and the body of the fish is dead. Control methods: (1) The wintering pond must be strictly disinfected before stocking the Anopheles to kill the pathogens; (2) The water temperature should be kept above 20°C, and the heat preservation and heating work should be done well; (3) Try to do it during fishing, handling and stocking. Avoid fish body injury, so that water mold is difficult to invade, and attention should be paid to the stocking density; (4) Aoni fish can be soaked with 3%~4% saline solution for 5~15 minutes before entering the pool to disinfect the fish body. , And to promote the healing of fish wounds; (5) When the water mold occurs, there may be 0.4g / L salt and baking soda mixture Quanchiposa or dip sick fish. The cause of the small melon worm: This disease is caused by parasitosis or invading the fish body, and the naked fish can be seen on the surface of the diseased fish, and there are many small white spots on the scorpion, ie, small melon worms. The disease is widespread and endangered. Especially serious. It is easy to parasitize small melon worms from Onyx fry to adult fish. The water temperature suitable for the growth and reproduction of small melons is 15°C~25°C, and the disease is prevalent in early winter and late spring. Diseased fish swimming slow, floating on the water, sometimes clusters around the pool swimming, fish body weight loss. Control methods: (1) Liquor must be disinfected with clear lime ponds prior to stocking to kill pathogens; (2) Reasonable stocking density, disinfecting fish during stocking, and preventing the spread of small melons; (3) Adoption after stocking 1 to 2ppm of methylene blue Quanchiposa, the effect is very good; (4) can also be used 90% of the crystal trichlorfon Quanchiposa; (5) copper sulfate and ferrous sulfate mixture is not available, because it is invalid for the small melon, And it will worsen the condition. Causes of Incidence: Occurs in the early winter or spring, due to parasitism parasites on the gills and skin and cause disease, the lesions are pale, diseased fish is thin and dark, breathing difficulties, floating water. The disease is extremely harmful and can cause a large number of deaths of 3 to 5 angels. Control methods: (1) immerse the diseased fish with 4% saline or 0.8ppm copper sulphate for half an hour; (2) 5:2 Quanchiposa with 0.7ppm copper sulphate and ferrous sulphate; or 0.7ppm Copper sulfate Quanchiposa; (3) Keeping the water temperature above 20°C will not prevalent the disease. The etiology of trichoderma: This disease is a common disease of Onyx, and it is prevalent in early spring, early summer and winter, because the trichodin parasites on the surface of tissues that are in contact with water, such as skin, fins, and gills. The diseased fish is dark in color, has poor feeding, is physically weak, and has slow swimming. Sometimes visible on the surface of the body is slightly white or bloody, mucus secretes more mucus, skin tissue hyperplasia, swollen silk, affecting the respiration of hernia, making it suffocate. Control methods: (1) Regular inspections, mastering the condition, and prompt treatment; (2) Using 0.7ppm copper sulphate and ferrous sulphate in a 5:2 mixture Quanchiposa, severe can be used 2 to 3 times. The etiology of the circumcision is commonly seen in summer, autumn, and wintering. The ringworm is hooked on the anchor hook and the edge hook to move the cocoon, causing damage to the tendon tissue. Diseased mussels are more mucus, swollen silk, black body, not feeding. This disease is often associated with trichoderma, and when the parasitism is strong, large numbers of Onyx fish can die. Control method: 0.3 mg/l crystal trichlorfon Quanchiposa once a day for 2 consecutive days.
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