Perch are found in just about every lake in Northwestern Ontario and we have them to. Most of the lakes around Vermilion Bay and Ear Falls have Perch. This far north they can reach good sizes. Some of our portage lakes are known to have Jumbo Perch.
With a Sports Fishing License you can bring home 50 Perch. That's a great way to bring fish home for the big fish fry. Just remember to keep the skin on them until you get home, especially if you have to go back over the border. You do not want the customs agents thinking you have 100 Walleye filets.