16 December 2008
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.