Sounds like you need to selectively breed BG for what kinda feed you're going to feed them. Aquamax strain BG, Purina strain BG, etc... Some BG like one feed over another, so if you selectively breed ones that like the certain feed you are going to feed your fish, then you're on your way???
I absolutely and whole-heartedly agree with the entire sentiment of this last statement.
I think you can select bluegill, or any fish for that matter, to like a certain type of food. I also think that fish do this themselves in a pond environment. If you have abundant glass shrimp, then you will quickly select for bluegill who like, and are good at capturing glass shrimp.
