In order to maintain our koi through the winter, we have an aerator in the pond. The bubbling air assures that throughout most of the winter there will be a hole in the ice that forms on the surface. This hole helps maintain the oxygen required by the fish.
However, when the temperatures drop and reamain below 10°F for a few days, the hole in the ice may close, as it did for a few days last January. As a consequence of this year's early freeze, we have watched the hole slowly shrink since Sunday. This morning a small hole remains at the apex of an ice formation that resembles a small volcano.
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