Popular seafood staple contains up to 64% less of key heart-healthy nutrient than older data showed
A USDA-led study found that farmed Atlantic salmon fillets contained considerably less of two heart-healthy omega-3 fats than older federal data indicated. The findings matter because salmon is a popular source of these nutrients, but chef Andrew Zimmern says they should prompt efforts to improve fish farming rather than discourage people from eating farmed seafood.
Researchers reported 63.8% less EPA and 47.5% less DHA, potentially reflecting greater use of plant oils in fish feed. The study analysed eight fillets bought from retailers in the mid-Atlantic, so its representativeness across producers and regions is uncertain. The USDA said the fish remains nutritious and that the sample was selected using standard methods to assess changes in nutrient levels.
In short
- Farmed salmon had lower omega-3 levels than older data suggested.
- The study tested eight fillets from mid-Atlantic retailers.
- Zimmern urges improving aquaculture, not abandoning farmed seafood.
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The case for
The findings support updating nutrition advice and food data: consumers may otherwise overestimate how much EPA and DHA farmed salmon provides. The measured reductions are substantial, and tracking them could encourage feed and farming improvements that restore these nutrients while helping people make informed choices.
The case against
Eight fillets from one US region may not represent farmed salmon across producers and markets, so the results do not justify broad conclusions about the seafood staple. Salmon remains nutritious, and discouraging people from eating it on the basis of limited sampling could overshadow its other benefits rather than prompt targeted improvements to fish feed.
Explained simply
Salmon is a widely eaten fish and a source of omega-3 fats, including EPA and DHA. These fats are associated with heart health, and farmed Atlantic salmon is raised in fish farms rather than caught in the wild.
Farmed fish get much of their nutrition from feed, whose ingredients can affect the nutrients in their flesh. The USDA, the US agriculture department, publishes data on food nutrients, which researchers and consumers use to compare foods and guide dietary choices.
The findings concern eight salmon fillets bought from shops in the mid-Atlantic, so they may not reflect all farmed salmon. They have also prompted discussion about whether changes to fish feed could improve the nutrients salmon provides.
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