I have had a few times that I would not get one bite on any bait I was using including lures. This happens only after the truck dumps the fish. I had to fish a couple of hours till the bite turned on. I think once the fish settle in they get aggressive and the bite gets better. I have been having a lot better results fishing the day after the stockings. Just my two cents.
Side Note: I have watched many a fly angler change out flies a lot until they find the one the fish wants.
Once the trout turn on they usually will bite on just about anything. There will be times they will only bite certain baits.