Thanks for the tips. I looked up a mercury article here on T-Nation. Apparently supplementing with N-acetylcystine helps protect against any mercury so I think I'll try and find some of this at a local store.
You're right there's a lot of sodium but I think that's always going to be true with canned food. The entire can has about 75% of the RDA for sodium. I had noticed this but it has some cholesterol as well. I'm actually glad to see that. It's just a hunch but I have a suspicion that getting some cholesterol from food is healthy.
I think this canned salmon might be the best value for some healthy, 'clean' food out there. I suppose that mackerel is cheaper but I never cared for that kind of fish.