It depends on where you live and how much ice forms on the water. If it gets extremely cold, be careful. Otherwise, res's can just brumate at the bottom, without any mud or loose debris.

I've done it successfully, but my location is in a sub-tropical climate. If you're in a very cold climate, you will need to take precautions with lack of oxygen, so just make sure you have a bubbler going throughout the winter. You may want to put some much at the bottom of you pond or pool too.

Make sure, however, you get them outside before winter hits, so they can adjust. Let them get used to the temps gradually. Putting them outside from a warmer temp could kill them.

More is to be said.

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