Smallies - yes, we have them although not by our choice.  The story goes that about a dozen were brought in in a pail in the mid-fifties to the Bloodvein system.  It was thought that they died out or were preyed upon by some of the big monster northern there but slowly they started to show up more and more on the end of peoples lines.  Now you can find smallmouth bass on the Bloodvein River downstream from the Larus Lake outflow to the Artery Lake outflow. So that means Barclay Lake, Simeon Lake, Sabourin Lake and Marys Lake.  They have also been caught in Musclow and we are also hearing Thicketwod Lake.
I have to say that we are not thrilled with this as we consider them an exotic and they will and have altered the natural fish communities present. We know that it will be impossible to eradicate them, but we do enourage folks to keep and eat what they catch.  It will be a losing battle, but time will tell how much they will encroach. Add climate change....?
As for other species, you mentioned whitefish, you will find whitefish in a number of northern lakes. They are usually incidental catches during the summer but can be caught first thing in the spring on surface.  They are such a tasty meal. The only other fish other than the big 3 you mentioned are muskellunge. One of the ost northerly populations is found on Irregular Lake in the south east corner.

A dozen years ago!!!!....what are you waiting for?

Maybe this reference will help in trip planning relative to fish species by lake.  (I cannot attest to its authenticity.)

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On a related issue, what is the current thinking on disposal of fish carcasses in WCPP.  Quetico seems to have gone back and forth between leave then for scavengers and "deep sixing" them.

dd