Ouananiche are best handled on a 6-8 wt outfit. Brookies require a 5 or 6 wt. Bring more than one rod, as this environment and the sheer number of fish caught can be rough on your tackle. Broken rods are common, and replacements are simply unavailable. Reels with a good drag, and a capacity for 150 yards of backing are just fine for the bigger rigs.
Lines are normally weight-forward floaters.
Bring a 250-450 grain sinking line, such as a Teeny for your heavier rod. On occasion, you might need a sinking tip for your lighter gear. Waders and felt-soled shoes are required. Metal cleats or studs are not appreciated in the boats. A wading staff can be a good idea.