And the best thing about white kings is they are all Canadian, eh.
White kings are not strictly canadian. When I worked at whitman we had jacks that came back as white kings. They were tagged as whitman fish so unless there is a canadian hatchery using their same tags, its highly unlikely.
Straight off F&G
http://www.adfg.alaska.gov/index.cfm?adfg=wildlifenews.view_article&articles_id=244