They don't stock bass or perch in Simcoe as you well know and the perch fishery is hammered year round but continues to hold up to the most angler pressured lake in the province. Mind you they don't net them either.
The Lakers and Whitefish are stocked due to the eutrophication of the lake and loss of suitable spawining grounds, not because of fishing pressure. Eutrophication is obviously a man made issue but the Lake Trout and Whitefish are starting to show signs of natural recovery due in part to the reduction of phosphorus loading, but of course there is no netting. A moratorium on Herring as shown a vast improvement of their numbers as well, but then again they're not netted.
Nipissing could be a world class fishery and guided charters along with local tourist oriented business' could bring in vast sums of money for all commercial business in the area, netting only brings in money for a select few and of course selective harvest along with catch and release can't be applied to gill nets!