Ok, I'm still thinking here. I like the idea of the experimental pond (might be a long time before we find out???? Maybe that fishless pond could show up with some fish--one year? two years?
The dead catfish on the side of the road is gone (sure something took it away for lunch). What if some animal bird or whatever)took a fish from one pond/creek to somewhere else.

Burgermesiter, I'm with you, sometimes it just happens! I think fish would show up in it, how, I don't know--I haven't figured that one out yet. \:\)