It usually takes a week for newly bought koi to adapt to the changes in the surrounding environment before starting to eat. Different individuals have different abilities to adapt to the environment, so we should pay attention to their behavior. Under normal circumstances, Koi with strong adaptability can be fed in three days, and one week with weak adaptability is enough. When newly bought koi adapts to the environment, it is necessary to control the water temperature between 20-25 ℃ and provide sufficient oxygen for water, so that they can adapt to the environment faster and avoid koi starving to death.

After they adapt to the environment, they should be fed gradually and appropriately. If the newly bought koi never eats any feed, it is likely to suffer from enteritis. At this time, just add some salt to the water to help them overcome it. As far as possible, don't pour the newly bought koi directly into the fish tank, but put the koi together with the bag in the fish tank first. In about two hours or so, they will gradually adapt, and then they can be poured into the fish tank. Pay attention to the frequency of changing water, which can be once a week. When changing water, pay attention to changing only one quarter of the amount of water at a time.

Koi has a wide range of food habits and can eat many foods, such as duckweed, water fleas, fish insects, earthworms, small fish and shrimps in water. They like to eat live bait. This feed is rich in nutrition, but it should be sterilized before feeding. This feed is easy to carry germs. They can also eat fruits and vegetables, rice, bread crumbs, steamed bread and so on. They also eat synthetic feed, which has a reasonable nutritional ratio and can meet the nutritional needs of koi daily growth.