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#1
07-01-2015, 03:26 AM
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Have a look through the pond forum. There are a few guys that keep their fish in the pond all winter long and they employ various strategies. You are on the right track with the trough heater although that may be wicked expensive to run over the winter. Keeping an air stone is a good idea. You could always try to keep the water moving with a magdrive (or similar) pump near the surface. A pond deicer is also a good idea to help keep a hole in the ice to allow gas to escape over the winter. Any gas trapped under the ice will most definitely kill all your fish.
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#2
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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#3
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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