Koi fish can starve without dying for one month. This kind of fish is still very hungry, and it is generally fine if it doesn't eat for a month. If it grows in the wild, it can even survive the whole winter, but before that, it will accumulate more food, and at the same time, it will enter a semi-dormant state after winter, with little activity and less consumption. However, in spring, a large amount of high-protein animal feed should be supplemented in time to restore physical strength.

1. Animal feed: Animal feed mainly includes fish insects, Cyclops, water earthworms, paramecium, wigglers and so on. This kind of food can survive for a long time in the fish tank, which can stimulate Koi's interest in eating. This kind of feed also contains a lot of protein, vitamins and other nutrients, which can promote the hair color and growth of koi.

2. Plant feed: Koi can also eat plant feed, such as aquatic plants and weeds. Although its protein content is far less than that of animal feed, it also has other nutrients such as fiber, which is beneficial to the health of fish.

3. Synthetic feed: Synthetic feed is rich in protein, sugar, vitamins, inorganic salts and fat, which can ensure the normal growth of koi. Eating these foods can also enhance the resistance of koi fish, so that they are not easy to get sick. Furthermore, eating this kind of food will make koi fish's hair color more uniform and make their gonads develop more soundly.