Will turtles ruin a pond? I have access to four ponds, and they all contain slider turtles or maybe it's painted turtles, and a few snapping turtles. They aren't really overpopulated with turtles, but I have caught a few this year. Do they really eat a lot of fish? Are they good or bad for a pond? Would it be better to remove some of them, or do they keep Mother Nature in balance? My dad cooked one of those old softshell turtles in a pressure cooker when I was growing up, and the smell gagged me and I doubt if I would ever consider eating them.