Buffer,
My father in law also goes to northern ontario probably close to where you went fishing. Remote lakes, hard to get to, clearly off the grid, pristine water, clear water, rocky bottoms, and he said too, it seemed only predator fish there. I couldn't imagine how they could survive without forage? he said outside of crayfish there were no minnows, no sunfish, bluegill, perch, just SMB (huge ones hanging out in the rocks) tons of pike and walleye. That is it! How does that circle of life maintain?

Also some lakes up there had lake trout that were there 'naturally' You wonder how a whole lake can have pretty much nothing but lake trout in it and yet no one put them there? It seems a single species lake has to have had some man made intervention at some point.

So those lakes don't winter kill just because of their depth? I wonder why Buffer's does then? Perhaps even those natural lakes winter kill now and then too?