The main reasons for the ulceration of Koi's body mainly include bacterial infections, water quality problems, and wound infections, etc. Bacterial infection is one of the main reasons for the ulceration of Koi's body. Especially when the water quality deteriorates, harmful substances in the water will invade the fish's body, leading to decay. In addition, wound infection is also a common cause. For example, injuries during hitting the fish tank, catching, or transportation can easily lead to bacterial infections.
The treatment methods include drug treatment, water quality management, and nutritional support. For bacterial infections, broad-spectrum antibiotics such as oxytetracycline or florfenicol can be used. Dissolve them according to the dosage specified in the instruction manual and add them to the water, and use them continuously for 5-7 days. For fungal infections, methylene blue or malachite green solution can be selected for a medicated bath. The dosage is 1-2 milligrams per liter of water, soak for 30 minutes, and do this for 3 consecutive days. For wound infections, gentian violet solution or fish disinfectant can be used to disinfect the ulcerated area.
Preventive measures include changing the water regularly, improving the water quality environment, and strengthening nutrition. Regularly changing the water is the key to keeping the water quality clean. It is recommended to change one-third of the water every week and use a filter to keep the water body clean. In addition, it is also necessary to maintain an appropriate water temperature (22-28°C), a pH value (6.5-8.5), and control the content of ammonia nitrogen and nitrite at a low level. In terms of nutrition, choose feed with high protein and rich in vitamins, and add an appropriate amount of vitamin C and E to enhance the skin repair ability.