Can I winterize a koi pond without removing fish in cold climates?

Yes, you can winterize a koi pond while keeping fish in place by adjusting feeding schedules, providing aeration, and ensuring ice does not completely seal the water surface. Stop feeding koi once temperatures drop below forty degrees Fahrenheit, as their metabolism slows. Using pond heaters or de-icers maintains a breathing hole, preventing dangerous gas buildup. Proper leaf removal and plant staging further protect fish without needing removal.