Measurement / residue studycited by the Tayebat archiveabstract only checked A-FSH-02 standard review
Flame retardants in salmon (2004)
Global assessment of polybrominated diphenyl ethers in farmed and wild salmon.
Overview
Hites RA et al.. Environ Sci Technol 2004 · PMID 15506184 · DOI 10.1021/es049548m
Farmed salmon had more PBDE flame retardants than wild salmon around 2002.
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?
Measure PBDEs.
- How was the study done?
Chemical analysis.
- How many people, animals or samples were studied?
Same samples as A-FSH-01.
- What was actually found?
Farmed > wild; Europe highest.
- How large was the observed effect?
Not in abstract.
- What do the results mean in everyday life?
Historic snapshot.
- What are the study's limitations?
Old samples.
- What does it say about Elawady's specific claim?
Supports historical claim.
- Do the results apply to Germany and Europe?
Low.
- What can explicitly not be concluded from this study?
Current differences.
Scientific in-depth review
1. Full reference
- Authors
- Hites RA, Foran JA, Schwager SJ, Knuth BA, Hamilton MC, Carpenter DO
- Journal
- Environ Sci Technol
- Year
- 2004
- Identifier
- PMID 15506184 DOI 10.1021/es049548m
- Verification
- verified – PubMed E-utilities efetch, 2026-10-25
- Retracted
- no
- Corrections
- none
- Extent checked
- abstract only
- Conflicts of interest and funding
not stated in abstract/record
2. Research question
Do PBDE levels differ between farmed and wild salmon and by region?
3. Study design and population
- Study design
- Measurement / residue study – Global survey of PBDE flame retardants in farmed and wild salmon
- Population
Same salmon set as A-FSH-01
- Country
Multinational
- Period
c. 2002
- Sample size
not stated in abstract
- Inclusion and exclusion criteria
not stated in abstract
4. Methods and endpoints
- Exposure / intervention
Farmed origin; region; wild species
- Comparator
Wild salmon species
- Endpoints
PBDE concentrations
- Statistical methods
not stated in abstract
5. Actual results
- Results
Farmed salmon had higher PBDEs than wild; Europe > North America > Chile among farmed; chinook highest among wild species.
- Absolute risks
not reported
- Authors' conclusion
Farm-raised salmon have higher PBDE levels than wild salmon; elevated levels in chinook may relate to trophic level.
6. Strengths
- Same large sample set
7. Weaknesses
- Historical
- No health-risk metric in abstract
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
As A-FSH-01.
9. Assessment of the statistical interpretation
Concentration differences only.
10. Relevance to the specific claim
C-FSH-01 support.
11. Independent contrary findings
I-FSH-02: PBDE levels low and comparable in farmed and wild Atlantic salmon (2017).
12. Transferability to Germany and Europe
Low.
13. Overall methodological judgement
Sound historical data.
| Multidimensional assessment | |
|---|---|
| Authenticity of the source | verified |
| Methodological quality | moderate |
| Risk of bias | some concerns |
| Precision of results | not applicable |
| Directness | direct |
| Reproducibility | partly replicated |
| Consistency with the overall evidence | consistent |
| Regional transferability | low |
| Adequacy of the interpretation (by the archive) | essentially correct but incomplete |
14. Open questions
15. Linked fact checks
- Farmed salmon contain significantly higher concentrations of organochlorine contaminants (PCBs, dioxins, chlorinated pesticides) and PBDE flame retardants than wild salmon, and European-farmed salmon carry the highest loads (based on samples analysed by Hites et al. around 2002). – Studies supporting the claim
- Farmed fish today accumulate PCBs, dioxins and PBDEs at concentrations significantly higher than in their wild counterparts (present-tense generalisation in the archive summary). – Studies supporting the claim
Use by the Tayebat archive
Note: according to the archive, the studies were compiled by the archive operators. Whether Dr. Elawady himself cited this study is not established.
- What the archive says about the study
Listed in bibliography (supports the PBDE statement in the summary).
- A. What was actually studied?
PBDEs in salmon.
- B. What did the authors find?
Farmed > wild.
- C. What conclusions do the authors themselves draw?
As found.
- D. What does the archive derive from it?
Part of 'contaminants bioaccumulate in the flesh'.
- E. Is this derivation scientifically justified?
Accurate for 2002 samples; not current.
- Adequacy of the interpretation (by the archive)
- essentially correct but incomplete