The reasons why golden koi lose color:

1. The reason why golden koi fades is because many aquarium merchants have fed golden koi a large amount of color-enhancing feed. The body color of golden koi becomes very bright and beautiful.

2. The fading of golden koi is related to genetic factors. Some golden koi will fade when they reach a certain age, which is inherited in the family.

3. The fading of golden koi is related to the environment. Changes in the water environment, changes in water temperature, and turbidity of the water environment will all cause the golden koi to fade

Solutions to the golden koi fading:

1. Feeding When raising golden koi, do not feed it feed containing pigments, and raise koi in a scientific and healthy way. Golden koi like to eat animal feed, and they are live animals, such as water fleas, water earthworms, etc. It is better to feed them 1-2 times a day.

2. Control the water temperature between 20-26 degrees Celsius. The water temperature should not fluctuate by more than 2 degrees Celsius. The water should be changed every 3 days. Golden koi are not cold-resistant, so the water can be heated appropriately in winter.

3. Clean and disinfect regularly. For disinfection, you can soak the fish tank or fish pond in 2ppm potassium permanganate solution for about 5 minutes, then wash it with clean water, and soak it in clean water for a long time before use.