1. Water quality deterioration: Not changing water in time is likely to lead to water quality deterioration in the tank. The water will contain a large number of bacteria, which will infect koi with poor constitution and make them sick. At this time, it will lead to the abnormal phenomenon of koi carp lying on the cylinder. At this time, it is necessary to change water and clean the fish tank, and at the same time, carry out medicated bath treatment. When changing water, change the water trapped in advance. This can effectively reduce the chlorine content in water. Every time you change water, you should change about one third of the water in the fish tank. At the same time, use potassium permanganate solution to clean the fish tank and fish body.

2, sudden change of water temperature: For ordinary family breeding, if the water temperature is not well controlled when changing water, they are likely to catch a cold due to sudden change of water temperature. At this time, they will lie prone. At this time, they need to rest and add salt to the water to relieve their symptoms. Generally, one thousandth of salt is added to the jar and rested for about a week.

3, indigestion: If they are fed too much, they will get enteritis because of their indigestion. Usually, koi fish with enteritis will lie prone. Enteritis can be treated by feeding garlic and salt. Feed 0.5 kg of garlic and 0.3 kg of salt for every 100 kg of fish. After feeding for about a week, their enteritis will be cured.

If koi lies prone to the jar, it needs to rest first to see if it can recover. If they don't recover, they need to heat up properly and oxygenate the water to help them recover.