What's happened
Major brands and some supermarkets have shifted canned mackerel from Atlantic (true) mackerel to cheaper, MSC‑certified Chilean jack mackerel. Producers say sustainability and supply constraints drove the change; consumer groups and reviewers say the replacement has lower omega‑3, different taste and texture and risks "skimpflation." Retailers say the species is labelled and sourcing follows standards.
What's behind the headline?
Who is changing what, and why
- Large suppliers such as Princes and several supermarket own brands have replaced canned Atlantic mackerel with Chilean jack mackerel. Producers have said the switch follows sustainability assessments and MSC certification, and that jack mackerel is cheaper to source.
What this will do to shoppers and nutrition
- Jack mackerel contains roughly half the omega‑3 and materially less vitamin B12 than Atlantic mackerel. That will reduce the nutritional value of a staple some households rely on for affordable omega‑3 and B12 intake. Retailers are selling the replacements at similar prices, which will increase pressure on household food budgets while lowering nutrient per pound.
Market and regulatory drivers
- Mackerel catches in the north‑east Atlantic have significantly exceeded scientific advice for years and stocks have plunged. The change in UK labelling rules in 2025 removed a legal barrier to marketing the South American species as "jack mackerel," which has enabled the substitution at scale.
Commercial incentives
- Suppliers will save on input costs because Chilean jack mackerel trades at roughly one‑third the wholesale price of Atlantic mackerel. That will protect margins and shelf prices for retailers while shifting nutritional value away from consumers.
Forecast
- Retailers will continue to prefer MSC‑certified, cheaper sources while north‑east Atlantic mackerel remains depleted. Pressure will increase on regulators and brands to improve labelling clarity and on public health advisers to reassess dietary guidance tied to canned oily fish.
What to watch next
- Whether supermarkets change pricing to reflect the lower nutritional value, whether labelling guidance tightens, and whether consumer backlash forces brand reversals or clearer on‑pack comparisons.
How we got here
Overfishing and quota disputes have driven north‑east Atlantic mackerel stocks down; producers have moved to MSC‑certified Chilean jack mackerel, which costs less but contains different nutrition and flavour profiles. UK labelling rules were changed in late 2025 to allow the new name on cans.
Our analysis
The Financial Times and The Guardian first reported the industry shift and consumer reaction: The Guardian quoted tinned‑fish reviewer Marcus Ansell saying the replacement scored "3.5 out of 10" and called jack mackerel a "completely different species" with inferior taste and texture (The Guardian, 11 Sep 2026). BBC Business reported Princes' move to jack mackerel, noting the firm said the new product is "clearly identified" and MSC‑certified; the BBC cited Marine Stewardship Council and ICES data showing north‑east Atlantic mackerel stocks have fallen dramatically and that catches have exceeded scientific advice (BBC Business, 12 Sep 2026). Independent and AP News outlined the spread of the substitution across multiple retailers and highlighted nutrition differences: Independent cited figures that jack mackerel has about half the omega‑3 of true mackerel and fewer calories per 100g, while AP placed the change in the context of social‑media food trends driving rapid shifts in consumption (Independent, 11 Sep 2026; AP News, 15 Sep 2026). Consumer group Which? warned that manufacturers must be "completely upfront" when changing recipes, a point echoed by Sue Davies at Which? in both The Guardian and BBC coverage. Princes has defended its decision, saying it will return to Atlantic mackerel if sustainable management and MSC certification are restored (The Guardian, BBC Business).
Go deeper
- How do omega‑3 and B12 levels compare exactly between the two species?
- Are supermarkets required to display species and origin prominently on cans?
- Will public health guidance update recommended portions for tinned oily fish?
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