If you were trying to cull any Black Crappie, I think you could have a net under that feeder and lift the net when there's a bunch of BCP feeding.
I had the same thought. It's on 'the list' to try. Although my guess is they would vanish pretty quickly when the net lifted. I might even just see if they'd take a small jig or maybe a floating 'popper' jig like I use all the time. I might be able to efficiently catch up quite a few.
Beats working... ;-)