Thanks for the replies and sorry for any confusion I caused with my question. I am familiar with coasters. They are actually common here on the north shore. Coasters spend most of their lives in Lake Superior and move into the rivers from time to time but they are primarily lake dwellers. The coasters in these parts spawn on rocky shoals in the Lake Superior and do not move into rivers to spawn.
My question referred to the resident brookies that live in the rivers for their entire lives. I know they are the same species but they have different habits.
I never see or catch resident trout during steelhead season. I have, on the other hand caught coasters in and around the mouths of these rivers.