Consumer watchdog warns surge of cheap ‘jack mackerel’ may signal ‘skimpflation’ in UK supermarkets

Which?, the consumer watchdog, cautions that the increasing shelf presence of canned jack mackerel—a lower‑priced, nutritionally weaker cousin of the classic Atlantic mackerel—could be a new example of what it calls \"skimpflation\". The phrase, introduced by the organisation, denotes a subtle drop in product quality or quantity while price tags stay roughly the same, leaving shoppers with reduced value for unchanged spending.

Unlike outright price inflation, \"skimpflation\" leaves the listed price largely untouched, yet the product’s heft is quietly trimmed. With cost‑of‑living pressures persisting, retailers feel the squeeze to keep aisles stocked without shifting higher raw‑material costs onto buyers. Replacing a pricier fish with a cheaper alternative is one tactic, but it also raises concerns about hidden public‑health costs.

Jack mackerel (Trachurus spp.) is a smaller, faster‑growing fish that fetches a lower market price than the richer, oil‑rich Atlantic mackerel (Scomber scombrus). Although both belong to the same family, the former supplies considerably less omega‑3 fatty acids and overall protein, making it a less nutritious choice for consumers who depend on canned fish for affordable essential nutrients.

Supermarket chains, feeling pressure from shrinking margins and volatile fish supplies, have broadened their canned jack mackerel assortments, often labeling them simply as \"mackerel\". Analysts link the shift to climbing wholesale prices for Atlantic mackerel, tighter fishing quotas, and Brexit‑induced trade disruptions that have curbed imports. Consequently, the cheaper option now enjoys greater visibility on everyday grocery shelves.

For many shoppers the swap can be hard to spot, especially when packaging fails to clearly state the species. Which? warns that buyers may mistakenly think they are purchasing the same health‑benefiting fish they have long bought, potentially undermining dietary goals without their knowledge. The group recommends scrutinising the fine print for scientific names or explicit species mentions and comparing the nutritional facts on the tin’s back.

Industry bodies and food‑safety regulators have not yet issued formal comments, but Which? says the case highlights the need for tighter labelling rules. Should the practice become widespread, the Food Standards Agency might be forced to revisit its guidance on species disclosure for canned fish. Meanwhile, the consumer group urges shoppers to stay alert and consider other protein options if nutritional content matters.