Koi

There are two koi fish in my pond. One is 3 years old, the other about 1. Both are getting quite big. They do fine over the winter. The pond is 5 ft deep in the center, so it doesn't freeze. And when its cold, the koi don't eat. Some years the pond is covered in several feet of snow for a month, though it always has an area where the snow melts and the water gets air. The fish are also fairly timid and hide quickly if I, or a cat, approach. New cats to the neighborhood will sit on the edge of the pond and watch, but they quickly get the idea that they can't catch the koi.