Q: What if my pond is aerated but it still
freezes over? Will my fish be OK?
Kyle – Amelia, VA
A: Cold snaps happen—and when they do, that could mean big trouble for your fish.
When extra-frigid temperatures create a solid sheet of ice over your pond or water garden, your fish could be in danger because toxic gases, like ammonia, become trapped below the sealed surface. That ice also prevents fresh oxygen from mixing with the water, which your finned friends need to survive.
To allow for gas exchange at the water’s surface, you need a hole in the ice. And how do you do that? By cranking up your aeration with air stones.
Stones Near the Surface
An aeration system with air stones, like the Airmax® PondAir™ Aeration Kit, gently and quietly moves the water surface, and the action created by the moving water keeps a hole in the ice while infusing the pond with fresh oxygen for the fish.
You can position the air stones throughout your pond, but here’s a tip for when temps really dip: Suspend the stones closer to the surface to keep the water moving at the top of the pond but calm at the bottom for your fish.
Still Frozen Solid
What if your pond still freezes over? Short-term, your underwater inhabitants should be OK. As long as you’ve been properly maintaining your pond, there should be enough dissolved oxygen in the water to sustain them for a week or so.
Long-term, however, is another matter. If the warming sunshine and your aerators fail to outdo Mother Nature’s cold streak, you will need to create a hole in the ice. Though it’s tempting to bust through the ice with a drill, hammer or other blunt object, restrain yourself. All that smashing could create sub-surface vibrations that are harmful to your fish. Instead, fill a bucket with hot water and pour it on one area of the pond to melt open a hole, preferably near the edge.
If arctic temps continue to dominate the forecast, you may also consider heating things up with a de-icer, which is an electric device that keeps a hole open in the ice. When used in combination with your aerator, you’ll be able to beat the chill—and keep you fish happy and healthy. Purchase as a combo kit for extra savings.
Pond Talk: When your pond or water garden freezes over, what do you to do keep a hole melted in the ice?