Corky rot

Also known as columnar disease. Cortical rot is one of the most common bacterial diseases of the punctal blister.

1, pathogens and epidemic situation: the pathogen is columnar flexibacteroids, due to the growth of the bacteria into a cluster of cylindrical phase, therefore, caused by fish disease, also known as cylindrical disease. Columnar bacillus is highly contagious. Fish are most susceptible to infection at water temperatures of 15–25°C, and are common in spring and autumn. In the event of appropriate pathogenic conditions during the period, the prevalence is extremely rapid and can be caused within 1-2 days of illness. A lot of death. Mostly sick are broodstock. During the period of illness, appetite decreased significantly and the body of the fish was thin, which greatly affected the development of gonads.

2. Symptoms: The main symptom is the site of infection, with grayish or slightly congested decay areas on the head, trunk, and rays. In severe cases, severe necrosis of the infected area occurs, the skin is damaged, and the epidermis is destroyed, resulting in extensive ulceration and inflammation of the muscles. Injury to the ankle, necrotic tissue appears from the tip of the silk, and appears brown, gradually extending to the base.

3, prevention and control methods: 1 strengthen the feeding and management, to avoid fish injuries, in the warmer season, pay attention to changing the water. 2 Use 2% to 3% salt solution to dip. 3 Add oxytetracycline to the food, add 180 grams of oxytetracycline per 100 kg of feed to make a bait and treat it for 7 to 10 days. 4 The broodstock was injected with 55 mg oxytetracycline per kilogram of body weight.

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