I did probe a bit to try to find out what he put in, I said..'if there are any tropical fish in that bucket they aren't going to last the winter' He seemed to understand that and indicated by his silence that there were no warm water species. I imagine he probably had a few fish caught in a local lake, including the bullhead, but you are right I'll never know.

I only have FHM, GSH, a few crayfish, a few 2" RES and long ears, no predators.

What do bullheads eat and what is a good bait to try to catch one?

Fish food, what would you put on the sign? simply no trespassing? Kind of an eyesore to have that right out by the road... BUt I agree with the liability thing..