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#1
07-01-2015, 03:45 AM
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My pond at my previous house was used to over winter my goldfish and koi. I just made half of the pond 3+ feet deep and this is usually enough to prevent freezing to the bottom in prairie winters. None of my fish were big monster so I never used any pumps or airlines but it doesn't cost much to run an airline all winter to keep the water oxygenated.
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#2
07-01-2015, 04:20 AM
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Probably doesn't get as cold here but - I just pull pump & filter out , let pond freeze over . Fish hibernate, ice forms barrier from weather & will insulate fish if deep enough. Don't keep water moving , otherwise water temp will drop lower than 0 & not freeze . Just make sure pond is deep enough to get warmth from under ground surface . Mine has only frozen 6" & is 2' deep , -15c
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