Mackerel, Meet Deception: The Great Fish Swindle Consumers in the UK are being duped by major supermarkets that have been quietly substituting genuine mackerel with cheaper, lower quality Chilean jack mackerel.
This deception is a perfect storm of culinary dishonesty, environmental neglect, and economic trickery.
The switch to Chilean jack mackerel, which has fewer calories and less omega 3 than its Atlantic counterpart, is a clear case of nutritional downgrading.