Interesting reading about Lebeau's research.
He mentions that Riverine musky exist with pike (Great Lakes, Mississippi drainage, English River drainage, Rainy R. etc...). The Riverine musky spawn a little deeper due to always existing with pike and adapting this way.
Seems the Lacustrine musky are in Kawarthas and most of Wisconsin. In these places musky spawn in shallow bays. Now with pike entering said spots they spawn two weeks earlier in same place and this is problematic.
Interesting huge musky Lebeau caught on Wabigoon in link below.
http://www.bonnybay.com/howbigdomuskiesget.htm