What are the common diseases of koi? vertical scale disease with high incidence of brocade carp in spring

[symptoms of fish disease]: some or all of the scales of the fish open like pine balls, and the scale sac at the base of the scale is dropsy. Press the scale with your fingers, and the liquid ejects from the scale sac, and the scale falls off. Sometimes accompanied by fin base skin surface congestion, exophthalmos, abdominal swelling, ascites and other symptoms. The diseased fish are slow to swim, have difficulty breathing, turn sideways and have an upward abdomen. If he is not treated in time, he will die if he lasts for about 3 days.

[cause of fish disease]: the disease is mainly caused by careless fishing, transportation, stocking and other operations, causing fish injury and bacteria invading by opportunity. This disease occurs every year in toad beach fish farm, Gaolan Shichuan fish farm, Lanzhou Qingcheng joint fishing ground and Yuzhong Wanchuan aquaculture farm, which mainly harms common carp and crucian carp. Grass chain and bighead carp occur occasionally. If not treated in time, it will cause a large number of deaths.

[prevention and control methods]:

Care should be taken in the operation of separate ponds to prevent fish injuries.

The bait was given immediately after the onset of the disease: 50 mg of oxytetracycline hydrochloride or 150 mg of sulfamethoxazole per kg of fish body weight per day was mixed and fed continuously for 5 days, while 1 × 10 Mel 6 bleach or 0.4 ×-6 Qiangliangxiaoling was sprinkled in the whole pool for 3 times.