Forty plus years ago my father would take me fishing in Algonquin Park lakes & in the lakes just outside of the park.  A lot can change in that time, of course, but it seems to me that Mad_Mat is right about the lake trout & brook trout.  I believe we also caught a few whitefish and even a bass from time to time. 

I recall those lakes seeming a little less fertile for fishing than what I've become accustomed to further west.  I believe this is actually true.  In recent years, I read something in a journal about the ecological basis for this.  Might have had something to do with the "acidity" of the water.  Honestly, I don't remember the details.  Fewer fish per hectare than the Q, though, for sure.

Even though I was a young kid at the time, I DO remember seeing a fair amount of logging & mining activity in that area.  However, those memories are swamped by the greater sense of "wilderness" that can overwhelm a very young kid from urban NJ.  Seemd "pristine" & wild to that naive boy.

I'm sure the area still offers some fine canoe routes.  No doubt northern parts of it provide a very reasonable substitute to the Q if "fishing" is not your main interest.

Jimbo   8)