How do I maintain an open ice hole in my winter backyard pond?

Maintain an open ice hole by using a floating de-icer or oxygenating aerator placed mid-depth. The de-icer gently warms a specific spot to prevent ice sealing, while aerators pump bubbles to keep water moving and break ice. Regularly check and ensure these devices run continuously during freezing spells to provide fish necessary oxygen and prevent toxic gas buildup under ice.