Generally speaking, baby fish will survive a winter in the pond if they are an 1 1/2 inches long or longer. Most of the time they are still blackish, grayish, brown, so you can't find them if you are trying to catch them to bring inside. Next spring they will be orange and you will think they magically appeared during the winter.
Just make sure there is a hole in the ice so toxic gases can escape and oxygen can get in.
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