oxytetracycline can generally be used to treat some bacterial diseases, such as rotten gills, rotten fins and enteritis. There are two ways to use this drug. The first is to mix it into feed, which is usually used when treating a large number of sick fish in fish ponds. 400 mg of drug should be added to each kilogram of feed and fed continuously for 6 days. The second is to mix the medicine into a solution and soak the sick fish, which is more suitable for family fish farming, and the concentration is generally 25ppm.

1. Change water: The first one of the old three ways is to change water. Although water change is indispensable for fish farming, the water change in this situation is different from that in peacetime, and it should be changed every other day to improve the water quality as soon as possible. The amount of water change should not be too large every time, because water change is already very frequent, and a large amount of water change will stimulate fish and be unfavorable to their recovery.

2, warming up: The second of the old three is warming up. Fish belong to temperature-changing animals, and their metabolism is related to the external temperature. The higher the temperature, the faster the metabolism, so that harmful substances can be discharged, which is very helpful for their recovery. However, the temperature rise should not be too high at one time, and should be controlled within 2 ℃ a day.

3, salting: The third of the old three samples is salting. The concentration of salt should not exceed five thousandths. Although this concentration can not kill bacteria, it can change the osmotic pressure, thus reducing the entry of water into fish, inhibiting the invasion of bacteria and avoiding further expansion of the disease.