http://nutritiondata.self.com/facts/finfish-and-shellfish-products/4204/2
You don't need to eat a can a day or anything (just toss it into your diet every once in a while), but canned salmon, with the bones, gives you (if you're looking at the general DV% guidelines:
Calcium-88%
Magnesium-27%
Iron-22%
Selenium-187%
Potassium-40%
Just a variety of red meat, fish, fruit and vegetables that others have already mentioned will "balance out" over time. I don't think it's necessary to meet 100% everyday, every day of the week. It's more of how things are overall.