Did you catch that episode of "River Monsters" where the host was trying to ID a very large fish (20 ft ish) that has been spotted in Iliamna Lake? It sounds very plausable that it is a white sturgen, but I've never heard of one up here.all of that is another reason I love alaska..
http://www.adn.com/2010/05/13/1277323/animal-channels-river-monsters.html