Gotta jump in on this, for the mystery exists too far, too remote and too often to be so easily answered by notorious midnight plantings of fish by over-zealous humans. I have always been told by old timer pond owners who never ever stocked their fish filled ponds that the ducks eat the fish eggs and out they come undigested. If you ever seen how quick corn goes through a duck or goose, say what you want, but common sense says this is at least one, though maybe not the ONLY way, fish find their way to new waters.
