They fed them small minnows that the hatchery raised. They are not easy to come by where I live in a subdivion, but I have been doing some ditch diving. They are 22 cent a piece at the fish store. The 35 crappie I have will eat 40 minnows in about 8 seconds. At this rate they are more expensive to feed then my kids. About to branch out to ponds on my way home from work.
I did try tadpoles today with no sucess!