Instead of those huge fish-oil tablets, can I just eat a can of sardines every day?

I've been told to take fish-oil to avoid future cardiac probems (I do have high blood pressure), but I can hardly stand to swallow those gigantic horse pills that fish-oil comes in. Besides that, they seem to make me a little bit nauseous about 15 to 20 minutes afterwards, although I can't be sure about that's because I dislike them so much. And I really like sardines on toast, so I wouldn't have any problem eating that every day. I'm a 49-year-old male, by the way.