I suspect you already know the answer to this but for those who do not:
Trout pellets are made from fishmeal (ground fish left over from manufacture of human food production) with added oils, proteins etc claimed by different manufacturers to enhance their product but in essence since fish are cannibalistic then it follows that they want to eat other fish and thus the best thing to feed them on is fishmeal ~ no matter how it is served up.
Obviously fish will eat other things, bread, maggots, worms, crabs, beetles ~ just about anything they can get their mouths round in fact but the sure fire bait is always another fish in one form or another.