I would concur basically with what Greg Roach said.
Seals are likely a big problem for salmon in localized areas, as opposed to out in the gulf or the Labrador Sea. There are 10, 11, or 12 million seals out there now; there are only 500,000 or 600,000 Atlantic salmon left.
To Dr. Hutchings' point about a stomach analysis, seals might be a problem, but you'd have to harvest so many and do so many stomach analyses that you may never figure that out. There are lots of confirmed reports, particularly in river areas where adult salmon come in to certain areas that are choke points. Seals do take quite a toll, but it's a localized issue as opposed to a bigger, broader issue.