The data collected by a team led by Kristina Miller, a researcher with Fisheries and Oceans Canada, suggest a virus may infect the fish while they are at sea, before they enter the river, and persists as they migrate to their spawning areas. (Kristi M. Miller/Fisheries and Oceans Canada)
Read more: http://www.cbc.ca/technology/story/2011/01/13/sockeye-salmon-deaths-virus.html#ixzz1B2XJB09V
allenbilly 
Too bad it looks like they are still not that clear on what is going on. I was hoping to see some salmon this summer, but it never happened even though it was a big run this year.