I was thinking the same thing last night after replying to Da Kine.
It seems like a great idea even without the PB. You'd think that the stockers would react to the sound and splash that imitates feeding time at the hatchery regardless of the presence of food, Like Pavlov's dogs.(Pavlov's Trout??)

I don't believe the gravel alone can be considered chumming. It probably wouldn't be too hard to convince some kids to do it for you if hassled. (Rangers let kids throw just about anything in the water. How are you going to stop the little darlings?)
I am definitely going to try it next time I'm shore fishing (I wouldn't want to test the Skinner ranger's reaction to throwing ANYTHING in the water from a boat.

DaKine, thanks for the reply. After my kind of snotty post, I looked back at some of your posts. Members like you and posts like yours are what makes this board as good as it is. I'm glad everything is cool :)
NoTrollMotor