My culling count for black bullheads is at (11).
Lots of work to be done on that front.
I believe these bull heads will find their way into any structure or box with a hole or holes in it. I had an old bird house that was sunk in my pond in about 2' of water. I saw a nasty bullhead writhing it's way out of the hole in the box. The hole was way smaller in diameter than the bullhead.
If you had something like that sunk w/ a floating marker, I think you could catch a lot of bullheads just by quickly pulling the box into the boat.