I may be repeating myself but I know of a guy that runs one of the largest goldfish farms in the country and he believes birds are responsible for transferring fish. This facility has 200 ponds and they raise some unique gold fish they ship all over the country and possibly the world. Anyway he says one of the private ponds in the are have these fish and they were never sold locally. He can only explain it by the herons that visit regularly. They get so many heron visits they have learned to live with it.
BTW the place is called Ozark Fisheries and it's located in Martinsville, Indiana. It has a sister fish farm in Missouri.
