Many koi keepers with heating systems raise their temperatures during the summer months.
In the summer I set mine to 73 degrees. If we have a hot summer it will go above this naturally but on cooler days will not drop below 73.
I also believe that Koi are able to heal themselves at temperatures above 70 so this is important as well.
Koi's immune system is said to shut off at about 50 degrees.
If you have a heating system then I would not let the temperature go below 55 degrees. I think this is especially importamt with small koi. You can still give them a winter by stopping feeding for 4 to 6 weeks.
Many people with heating systems have different ideas on what you should do but above is what I am doing at present.
Posted on Jan 9, 2007, 8:35 AM from IP address 86.128.33.248