As one of the excellent ornamental fish, koi fish has a great demand for protein. Protein is not only the energy source of koi fish, but also an important part of its body structure, which plays a very important role in the growth of the body and the improvement of immunity. Therefore, feed should contain enough protein.

At the same time, attention should be paid to the source of protein in feed. Koi fish's favorite feed should contain high-quality protein, such as dried shrimps, dried shrimps and fish meal. Feed containing protein is not suitable for koi fish, because the content of essential amino acids such as lysine and methionine in protein is low, which is not conducive to the healthy growth of koi fish.

2. Appropriate amount of vitamins should be added to the feed.

Besides protein, koi fish needs proper amount of vitamins to promote nutrient absorption and enhance its resistance. Vitamins added in feed include vitamin A, vitamin D, vitamin E, etc. Vitamin A can promote the growth and development of koi fish, vitamin D can help the absorption and utilization of calcium, and vitamin E can keep fish healthy.

However, when supplementing vitamins, you need to pay attention to the right amount. Excessive vitamin A and vitamin D will have adverse effects on koi fish's health and even lead to poisoning. Therefore, when choosing feed, we should choose products with reasonable vitamins and try to avoid excessive intake.

3. Feed should contain proper carbohydrates.

Carbohydrate is another important nutrient needed by koi fish and the main energy source of koi fish. For koi fish, proper carbohydrate content can promote its growth and improve its immunity.

It is worth noting that the types of carbohydrates contained in feed are relatively simple, because koi fish is not suitable for some carbohydrates, and if you eat too much, there will be problems such as gastrointestinal discomfort. Therefore, when choosing feed, we should choose products containing appropriate carbohydrates, and pay attention to the number and frequency of feeding.

4. The fat content in feed should not be too high.

As one of the important energy sources, feed needs a small amount of fat, but too much fat will cause digestive system problems, and even lead to fatty degeneration of the liver, which will have a serious impact on fish health. Therefore, when buying feed, don't choose high-fat products, add appropriate amount of fat according to the needs of koi fish, and cherish the health of koi fish.