. 1. Reason: The white background color of black koi may be too light. They will change their color according to the surrounding environment.
2. Solution: Breeders can change the dark background so that they can return to black after a period of time.
water quality 1. Reason: If the water quality is too poor, the black koi will turn white. This is a self-protection instinct of Koi, because poor water quality will affect their health, so they will slowly fade or turn white.
2. Solution: The breeder needs to change the water in time, keep the PH value between 7.2 and 7.4, and ensure that the water quality is clean. During this period, the water temperature should be kept constant, and the feed for color enhancement should not be fed. Pay attention to the amount of water when changing water, and control the amount of water each time to a quarter of the total amount of water.
1. Cause: It may also be Saprolegniasis, which is mainly caused by injuries in the process of transportation, fishing or fish fighting without timely treatment. After getting Saprolegniasis, the fish will appear white patches, and there will be white flocs on the patches.
2. Solution: Saprolegniasis is contagious. Breeders should first isolate the diseased fish and then raise the water temperature to 25 ℃. If saprolegniasis is not serious, five thousandths of salt can be added. If Saprolegniasis is more serious, it is necessary to use oxytetracycline for medicated bath, once a day, 10-20 minutes each time. If you stick to it for a week, you can recover. During the treatment period, the breeder needs to change water every day and stop feeding.
