If koi poisoning occurs, it needs to be fished out and soaked in clear water, or put a little baking soda. After poisoning, the physique of fish will become weak, so the water quality cannot change too much, otherwise it will cause great harm to it. You can change one fifth of the water every day for half a month or a month, and keep filtering and oxygenation at the same time, so that you can recover slowly. If the poisoning is too deep, the possibility of recovery is not high.

1. Food spoilage: Koi is poisoned, which is usually related to eating spoiled food. This kind of fish has a miscellaneous diet. It will try to bite anything put in the water, but it will spit out if it doesn't fit the mouth. However, if the food goes bad, the fish may not notice it, so it will be poisoned after eating it. Therefore, it is necessary to pay attention to check to see if the fish food has gone bad.

2. Drug poisoning: Besides food poisoning, drugs can also cause koi poisoning. Drug poisoning is usually caused by the failure to control the dosage in the treatment process, thus forming drug damage. As the saying goes, drugs are three-point poisonous, so we must pay attention to the use of drugs, whether it is yellow powder or gentamicin, we should not use too much, and avoid the use of malachite green and other dangerous drugs.

3. Unsterilized: If you put anything that is not sterilized in the fish tank, it may lead to koi poisoning. Therefore, no matter what things are put into the fish tank, they must be soaked in potassium permanganate solution for a period of time.