Let's try to get something straight TIER. Are you talking about Northern Pike and Burbot, also known as Lawyers, eelpout, and a few other things. I'm thinking since you mention them along with Pike you might be meaning Bowfin, otherwise known popularly as dogfish. They are easy to tell apart. When you grab a burbot by the head he wraps his body around your arm like a snake. Bowfin are ugly prehistoric scaled beasts that fight like crazy and DON"T try to lip them like a bass. And Walleys are called Pike in some areas. If you mean, and I think you do, Northern Pike in the Exos family with pickerel and musky, then big flies stripped hard with short pauses are usually the best way to take them.
If you have dogfish in the same waters they might hit the streamer you're fishing for northerns but will just swim up lazy and grab it and hold it until you set hook. I've often seen them swim by right next to the boat (I used to live up north) with a bluegill or small bass in their mouth making no attempt to eat until they were sure it was dead and not going to swim away.If you PM me your address I'll send you a couple of flies like we used to use for pike up north plus a few of the newer articulated styles.
ps...If you do have walleye in your lakes I used to catch them on black feather streamers that I assumed they took for a leech, one of the popular live baits for them. If you have them let me know and I can include a few flies like I used for them and though I didn't have any then I'm thinking a bunny leech in black or brown would do the job when they're shallow in the evening.