Hi Josh…Not sure of what area you were thinking off, but brook trout waters in all of southern Ontario are only “marginal”. That means that they are not prime. You can catch brook trout in most of the head-water tributaries that flow into Lake Ontairo & Lake Huron, but these brook trout are few in numbers and mostly under 10″ in size. To have good brook trout fishing you really have to go north, at least as far as the Algonquin Park area…God bless you, Italo
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