Bream heads are my go to bait for blues. Channels don't seem to want them, only the bigger blues, of which I am after. If you scale and fillet the side meat they will eat it as well. Some use cut pieces, but I prefer the heads and fillets...all caught by hook though. I used to use crappie heads on wateree, but now with a 8" size limit you have to keep the crappie whole or it is 2 days in the electric chair...