There is always a lot of debate on the temps used to keep koi at. Some will tell you that a cold period combined with a period of fasting helps body confirmation and color development. Those of us who have kept koi we work to develop for shows will agree while others will say that isn't really important. read more
Koi are cold-water fish, but benefit from being kept in the 15–25 °C (59–77 °F) range, and do not react well to long, cold, winter temperatures; their immune systems are very weak below 10 °C. Koi ponds usually have a metre or more of depth in areas of the world that become warm during the summer. read more
Failure to keep your koi's water within the acceptable temperature range can lead to the death of your fish. Temperature Range According to Koi Acres, a company that sells koi and koi supplies, koi fish are able to survive in water that is anywhere between 34 and 90 degrees Fahrenheit. read more
Koi kept in heated ponds do not have to adjust to changes in water temperature. Feeding Koi properly during the summer months encourages growth, helps in tissue maintenance and repair as well as helping lay down fat deposits and providing nutients that the fish can store for use during the winter months. read more