Dave,
The regs are by Zone. 'ya have to remember that the 18 zone here is not very densely populated (say about 120,000 habitants for over 30,000 sq miles of public forest land). Even in early July, I can drive 1 hour and fish on a public access lake where NOBODY has yet to fish this year.
To give you an idea of the scope of the zone, I am the supervising forester for some public land here. In the 100 million acre area, there are over 82,642 miles of rivers and steams, and about 96,186 lakes averaging 45 acres in size. The population base is about 155,000 people, of which a small minority actually fish.
20 sounds like a lot, ... Yes 20 is too much, but 99% of the fishing is in lakes. Canada is pretty vast and the "mind set" of the enviro-friendly West has not yet established itself here in East-Central Canada (Quebec/Ontario).
From experience doing some integrated resource mgmt plans for the local outfitters, when we reduce limits (daily and annual, there will be some BIGGER fish and the entire population curve shifts UP.
Photo: White Falls - I think a friend was the only person that fished the bassin last year.