I can't answer for sure, but i know other places I fish, if you would want to use them for bait, they would have to be of legal minimum size for that species. I'm just going off of what I KNOW from fishing the ches. bay. We've used croaker as bait, but they have a minimum size of 9" so inorder for us to keep and use them, they have to be at least 9".
I would ASSUME, but not 100% sure, it would be similar for perch.
"I've never seen a wild thing feel sorry for itself..."