I have a book on lake erie comercial fishing that has a whole chapter about these fish. They believe this strain of walleye to be a hybrid with a blue pike. The blue pike went extinct in lake erie a long time ago. 30's-40's if im remembering correctly. In that article it was said that a scientist actually caught a couple of hundred of these blue pike and transported them to a small lake somewhere in the western us. I believe this to be an undisclosed location. They said that these blue pike spawned with the native walleye and now this lake has blue tinged walleye. Heres a link to that book. Its a very intresting read and i enjoyed it. http://www.sonsoflakeerie.org/Fishing%20Book.htm