The addition of heaters may be an ideal way to keep your water warm enough for your fish in the winter. Not only will this keep the water warm enough for your fish to be comfortable, but it will also prevent a layer of ice from forming over the surface of the water. This allows oxygen to enter the water and toxic gases to escape into the air.
Some fish are more suited to cold temperatures than others. Do some research into your particular climate and the fish you intend to stock your pond with. Compare and contrast your conditions with what each type of fish prefers. THis is the best way to be prepared to provide your fish a healthy and safe environment through the winter.
