I would imagine if someone ratted you out , and the MNR decided to a DNA test on your Walleye , if they are deemed Nipissing Walleye , then your ( at home ) possession limit , would be 2 fish per angler...
I can see this becoming a problem , considering that Nipissing is the only lake that has a 2 Walleye limit and is surrounded by 4 Walleye limit lakes , enforcement is gonna have fun trying to figure it out on a roadside spot check .