Pathogen: Virus
Symptoms: At the beginning of the disease, many white dots appear on the surface of the diseased fish, covered with a layer of white blocky mucus. With the development of the disease, the number of white spots continues to increase, and at the same time, the area of ​​spots continues to expand. As a result, the epidermis at the site of the lesion gradually thickens, forming paraffin-like growth organisms, and the shape resembles pox sores. Therefore, it is referred to as “acne diseaseâ€. . Acne sores grow naturally to a certain extent, and then new blemishes appear again in the original affected area, eventually causing the fish to lose weight and die.
Hazardous objects and epidemic conditions: The 2nd instar carp, which mainly affects the wintering period before and after wintering in pond culture, usually occurs from autumn to early winter and spring, and the water temperature appears at 10~15°C. Due to the low incidence and the non-infection of other fish in the same pool, it has not attracted people's attention to this disease. In recent years, due to the vigorous development of high-density cage culture technology, the disease has become increasingly serious and the incidence has gradually increased.
Control methods:
1. After spring, each meter of water depth per meter of water is diluted with 50 ml of "sterilized red" or 200 to 400 ml (0.3 to 0.6 ppm) of "efficiently sterilized iodine", and then the whole pool is splashed and used once a week to control the virus in water. quantity.
2, after feeding the fish, in the feed to add 2 ‰ of the "ultra-concentrated photosynthetic bacteria" and 0.3% of high stability and easy to restore Vc, in order to improve the body's immune system.
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