How To Take Care Of Koi Fish In Winter. Keep koi in large aquariums for a few months at a time. Placing a de-icer and air stone in the pond.
Regular fish tanks arent big enough for Koi fish. There are several ways to take care of your Koi in the winter. Their mouths are tiny so be sure it is very fine.
Think of Winter as a down period for your pond as less events happen during Winter then any other time.
Moving the Koi to an indoor pond. If you live in an apartments you may have to keep koi in aquariums for their entire life. Couple that with the fact that the kois immune system is in an essentially non-functional state during winter and youll understand why fish are more prone to disease at this time of year. The rule goes a koi pond should hold 500 to 1000 gallons of water for every adult koi it carries.