I can only imagine how disheartening this is. I gotta believe something happened more than just the bad winter. Four inches of ice and 10 inches of snow is nothing. My pond is about 3/4 acre, on a normal winter I've got 24 inches of ice and we get 4 feet of snow. I will say that I plow about 30% of the pond to let some light in. But I think if I only had 4 inches of ice with a little snow things would work fine without plowing. I wonder if perhaps you aerated too much. I don't think you would want to run an aerator 24/7 in a very small pond or you would make the water too cold. But only some temeperature measurements would tell you for sure if that was causing a problem. I wonder what the oil slick was? Some real experts will have to chime in.
