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I found the following post on a food-related forum (here):

Farmed fish do have omega 3 in them. They have a chunk of omega 6 too so while they do have omega 3, they're not ideal for normalizing the ratio. However there is a case in which sardine flesh is being sold after the omega 3 has been extracted to make sardine oil. A good rule of thumb is that the saturated fat should be about a quarter or less of of the total fat if the tin doesn't specifically say that it has omega 3. If saturated fat is a higher percentage of the sardine, the omega 3 has been removed. Also be wary of fish canned in oil. Bad news!

Why should we be wary of fish canned in oil?

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This is most likely referring to the fact that canned fish is often packed in vegetable oils, which add fat content while not providing the omega-3 content of fish oil.

  • Ha. It didn't cross my mind that it might be that simple. Good thinking! Upvoted. – traveh Jun 3 '15 at 21:11
  • Though I must say that the phrasing "Also be wary of fish canned in oil. Bad news!" sounds pretty severe, I wonder if there's anything else to it. – traveh Jul 11 '15 at 13:52

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