What are the common diseases of koi fish? A detailed explanation of the spring outbreak of dropsy with erect scales
In spring, fish are prone to dropsy with erect scales. Because of stocking fry or relocating fish in spring, it is often a season with frequent fish diseases, and most are caused by physical damage to the fish body. Dropsy with erect scales, a common spring disease of koi fish. Dropsy with erect scales is also called scale-erection disease or pine-cone disease. Its symptoms...
[Fish disease symptoms]:The fish's scales stand up locally or completely, opening like a pine cone, and the scale pouches at the base of the scales become edematous. When the scales are pressed with a finger, fluid squirts out from the scale pouches, and the scales fall off along with it. Sometimes there is also congestion on the skin surface at the base of the fins, protruding eyeballs, abdominal swelling, ascites and other symptoms. Sick fish swim sluggishly, have difficulty breathing, turn sideways, and float belly up. If not treated in time, they will die after about 2-3 days.
[Fish disease causes]:This disease is mainly caused by careless operations during catching, transport and stocking, which injure the fish body and allow bacteria to invade. This disease occurs every year at our city's Hamatan Fish Farm, Gaolan Shichuan Fish Farm, Lanzhou Qingcheng Joint Fishery, and Yuzhong Wanchuan Comprehensive Aquatic Breeding Farm, mainly harming carp and crucian carp. Grass carp and bighead carp are occasionally affected. If treatment is not timely, it will cause mass deaths.
[Prevention and control methods]:
Be careful during pond separation operations to prevent injury to the fish body;
After the disease occurs, promptly feed medicated bait: use 50 mg of oxytetracycline hydrochloride per kg of fish body weight per day, or 150 mg of compound sulfamethoxazole, mix with feed and feed continuously for 3-5 days, and at the same time splash the whole pond with 1×10-6 bleaching powder or 0.4×-6 strong disinfectant spirit, using it 2-3 times in a row.