Most of the good fishing lakes are a little ways away from duluth like 20 min or so. However the St. Louis River is good for walleyes, muskies and catfish. Use crawler harnesses or rapalas to get eyes on the edges of the river channels in the middle to the mouth of the river. For cats go up to the Fon Du LaC area look for current seams just off the river channel in 10-18FOW. I don’t know how big of a boat you have but they are catching fish in Lake superior as well. They are getting fish in the top 20-45FOW over deeper water. Pull F-9 rapalas or spoons getting into that range. You will catch Cohos Lakers and the odd King. If you can fish a lake 20 min away either go to chub in Carlton, you will catch fish hear, or Fish lake Flowage. Chub has a lot of bass and pike you will catch crappies but small and some okay gills. Fish lake would be better for keeping fish they have bass, pike, eyes, crappies, and gills. Both lakes shouldn’t be hard to find fish in.