Measurement / residue studyindependent cross-checkabstract checked★ key study I-FSH-110 in-depth review
Farmed salmon in US shops now has more omega-6 and less omega-3
Foundation Foods reveals significant changes in farmed Atlantic salmon relative to Standard Reference Legacy data.
Overview
Bukowski MR et al.. Front Nutr 2026 · PMID 42609372 · DOI 10.3389/fnut.2026.1870100
In 2023 farmed salmon had 2.4 times more linoleic acid and less than half the EPA+DHA of older database values, but still more EPA+DHA than wild sockeye.
Does the study support the specific claim? Partly · Methodological quality: moderate
Plain-language summary
Study explained simply
- What did the researchers want to find out?
Update fish composition data.
- How was the study done?
Analysis of 8 retail fillets per species.
- How many people, animals or samples were studied?
Five species.
- What was actually found?
Farmed salmon n-6 now exceeds n-3; tilapia is low in both.
- How large was the observed effect?
LA 0.90 to 2.15 g/100 g.
- What do the results mean in everyday life?
Farmed salmon remains a good EPA+DHA source; tilapia is not.
- What are the study's limitations?
Small sample.
- What does it say about Elawady's specific claim?
Supports a lower ratio; does not show harm.
- Do the results apply to Germany and Europe?
Moderate.
- What can explicitly not be concluded from this study?
Health effects.
Scientific in-depth review
1. Full reference
- Authors
- Bukowski MR et al.
- Journal
- Front Nutr
- Year
- 2026
- Identifier
- PMID 42609372 DOI 10.3389/fnut.2026.1870100
- Verification
- verified – PubMed efetch 2026-10-26; Crossref checked; full text PMC13478241: methods, Table 4 and parts of the discussion read
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
USDA Agricultural Research Service
2. Research question
Has the fatty-acid composition of common US retail fish changed compared with legacy database values?
3. Study design and population
- Study design
- Measurement / residue study – Food composition analysis of US retail fish (USDA Foundation Foods) compared with legacy data
- Population
Retail fillets: farmed Atlantic salmon (Chilean producers), wild sockeye salmon, farmed Nile tilapia, farmed channel catfish, wild cod
- Country
USA (retail)
- Period
September-October 2023
- Sample size
8 samples per species (cod 7)
- Inclusion and exclusion criteria
Whole skinless raw fillets
4. Methods and endpoints
- Exposure / intervention
Production type and feed
- Comparator
USDA SR Legacy values
- Endpoints
Fatty acids (g/100 g)
- Statistical methods
Comparison with a ±20% threshold and FF mean ± 2 SD
5. Actual results
- Results
Farmed Atlantic salmon (2023): linoleic acid 2.152 versus 0.900 g/100 g in legacy data (2.4-fold); ALA 0.510 versus 0.148; EPA+DHA 0.889 versus 1.962; total n-3 1.78, total n-6 2.31. Wild sockeye: EPA+DHA 0.534, n-3 0.732, n-6 0.085. Farmed tilapia: EPA+DHA 0.031, n-3 0.119, n-6 0.297. Farmed catfish: EPA+DHA 0.058, n-3 0.138, n-6 0.981 (all g/100 g raw fillet).
- Absolute risks
not applicable
- Authors' conclusion
Farmed salmon composition has shifted (more LA and ALA, less EPA and DHA); database values need review.
6. Strengths
- Recent individual-sample data
- Government laboratory
7. Weaknesses
- Small convenience samples (n=8)
- US retail only; farmed salmon from Chile
8. Risk of bias
- Orienting tool
- none applicable
- Type of assessment
- simplified assessment (abstract only)
- Full formal assessment
- no
- Overall risk of bias
- some concerns
- Rationale
Small n.
9. Assessment of the statistical interpretation
Recomputed n-3:n-6 ratios: farmed salmon 0.77, wild sockeye 8.6, tilapia 0.40, catfish 0.14 (stats/C-FSH-04_ratios.py).
10. Relevance to the specific claim
C-FSH-04: confirms a lower ratio in farmed salmon (now below 1). C-FSH-05: farmed salmon still has more EPA+DHA per 100 g than wild sockeye. C-FSH-06/07: tilapia has little n-3 and little absolute n-6.
11. Independent contrary findings
12. Transferability to Germany and Europe
Moderate (feed practices similar).
13. Overall methodological judgement
Current composition data; strengthens the direction of C-FSH-04 and C-FSH-06.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | moderate |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | moderate |
| Adequacy of the interpretation (by the archive) | not applicable |
14. Open questions
15. Linked fact checks
- The omega-3 to omega-6 ratio is about 10 in wild salmon but only 3-4 in farmed salmon. – Studies supporting the claim
- Because of the lower omega-3:omega-6 ratio, farmed salmon is converted from an anti-inflammatory into a pro-inflammatory meal, and the expected nutritional benefit disappears. – Studies with mixed or unclear results
- Farmed tilapia and catfish have low omega-3 content and very high long-chain omega-6 to omega-3 ratios compared with salmon and trout. – Studies supporting the claim
- Because of its fatty-acid profile, farmed tilapia is an inflammation-promoting food for heart and joint patients. – Studies contradicting or limiting the claim