I always filtered the water. When canoeing in northern Quebec, I never did, but as you stated, different river system (and climate).
I always managed to catch a few fish dinners on the Bloodvein in early season, during June/early July. I wouldn't be certain of sufficient catch in August, as the Pickerel fishing usually slows down by then.
My most memorable fish dinner on the Bloodvein occurred during late June 1998, when in early evening I was searching out a campsite and ran into a couple of Conservation Officers. I was traveling solo, and the two gentlemen invited me for supper. They had caught quite a few Pickerel, and we had a huge fish fry. Great meal, great memory!
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Always a good day, east of James Bay.