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If you go deeper than ~3' you pond should never freeze solid. As long as the fish don't freeze solid in ice, they should be fine.
Comets (common goldfish) are a pretty solid choice for ponds. You can buy them cheap as feeders, and they should survive the winter without a problem.
A fountain in the winter is a bad idea, there is a thread somewhere describing how the stream of water froze, and most of the water rerouted out of the pond. All you really need to do is a keep a hole open in the ice to allow gas exchange. A small heater will do the trick.
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