Actually the original pond was about 50 years old. During the drought 2 years ago it went bone dry. I basically had it rebuilt. It was dug out to 12 ft depth and enlarged slightly. So I started with a fresh slate. But one peculiar thing did happen. I had several tires along the bank to prevent erosion while it filled and several washed into the pond floating around. I pulled one out and there was about about a four inch fish of some sort that wiggled its way out before i got a good look at it. It appeared to be a sunfish of some kind (prob GSF). This was at half pool. My run off is up a hill coming from my house about 10 acres up with no pond anywhere upstream. And this was before stocking and about six months after the renovation.