Nezam El-Tayebat Fact CheckA scientific assessment of the “نظام الطيبات” nutrition system
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Mostly true Certainty of evidence: low provisional C-FSH-11

Farming carnivorous fish species depletes the wild fish stocks used as feed rather than relieving pressure on the oceans.

Conclusion: Partly correct for carnivorous species in 2000; not a health argument.
  1. Original statement
  2. Scientific assessment
  3. In plain language
  4. Studies on this claim
  5. Regional context
  6. What applies in my country?
  7. References

Original statement

استزراع الأنواع المفترسة يستنزف الأرصدة البريّة كأعلاف

verbatim according to source. Translation by the project; the Arabic wording is authoritative.

Translation

Farming carnivorous fish species depletes the wild fish stocks used as feed rather than relieving pressure on the oceans.

Origin

Source status
Archive editors
Attribution
Archive editors (eltayebat.com)
Origin
https://eltayebat.com/rule/farmed-fish/
Attribution uncertainty
Archive editorial narrative and featured-study cards, written by the archive operators; study selection is the archive's, not necessarily Elawady's.
Claimed mechanism

Wild fish used for fish meal/oil.

Claimed health effect

Ecological (not health).

Geographic restriction by Elawady

none found

Scientific assessment

Mostly true – Correct at its core, but with limitations or minor inaccuracies.

Certainty of evidence: low – Further research is likely to change the assessment considerably.

1. What was claimed?

Aquaculture of carnivorous species depletes wild stocks.

2. What is demonstrably correct?

Naylor et al. 2000 stated that the opposite of relieving pressure is true 'for some types of aquaculture', especially carnivorous species (A-FSH-19).

3. What is wrong or exaggerated?

The archive omits that the same paper concludes that aquaculture overall still adds to world fish supplies. Since 2006, salmon feeds have replaced much fish oil with plant oils (I-FSH-01).

4. What remains unclear?

Current net balance.

5. Which studies support it?

A-FSH-19.

6. Which studies contradict it?

A-FSH-19 (overall conclusion), I-FSH-01.

7. What applies to Germany and Europe?

Much farmed salmon sold in Europe is Atlantic salmon; since 2006 its feeds have replaced much fish oil with plant oils (I-FSH-01), which reduces wild-fish inputs.

8. What is known about Egypt?

Tilapia is mostly omnivorous; this argument applies less to Egyptian tilapia farming.

9. What practical conclusion is appropriate?

This is an environmental, not a health argument.

Assessment details

Rationale for certainty of evidence

Based on a 2000 Nature review; feed composition has since shifted toward plant ingredients (I-FSH-01), which lowers wild fish inputs. The same review states that 'on balance, global aquaculture production still adds to world fish supplies'.

Source quality

Highly cited review.

Regional transferability

Global.

Individual exceptions

Not applicable.

Regional scope of the claim
general (biological/medical)
Last reviewed
25 October 2026 provisional

In plain language

A 2000 review in Nature found that farming carnivorous fish like salmon needs a lot of wild fish as feed. The same review said that fish farming overall still adds to the world's fish supply. Feeds have changed since then. This is about the environment, not about whether the fish is healthy to eat.

Studies on this claim

Studies supporting the claim (1)

  • Does fish farming help wild fish stocks? (2000)

    Naylor RL et al.. Nature 2000 · PMID 10890435 · DOI 10.1038/35016500
    Narrative reviewcited by the Tayebat archiveabstract only checked

    Farming carnivorous fish uses many wild fish as feed, but aquaculture overall still adds fish.

    Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    Assess supply effect.

    How was the study done?

    Review.

    What was actually found?

    Mixed effect.

    What do the results mean in everyday life?

    Environmental issue.

    What are the study's limitations?

    Old.

    What does it say about Elawady's specific claim?

    Partly supports.

    What can explicitly not be concluded from this study?

    Health effects.

    Scientific details →

Studies contradicting or limiting the claim (1)

  • Omega-3 in Scottish farmed salmon 2006-2015

    Sprague M et al.. Sci Rep 2016 · PMID 26899924 · DOI 10.1038/srep21892
    Measurement / residue studyindependent cross-checkfull text checked★ key study

    Omega-3 in farmed Scottish salmon roughly halved from 2006 to 2015 (2.74 to 1.36 g per 100 g), but it still had more omega-3 per 100 g than the wild salmon tested (0.76 g) and most other foods.

    Does the study support the specific claim? Partly · Methodological quality: high · Certainty of evidence: see overall assessment of the claim

    Original publication · Scientific details

    Study explained simply
    What did the researchers want to find out?

    Track omega-3 over time.

    How was the study done?

    Fatty-acid analysis.

    How many people, animals or samples were studied?

    >3000 salmon.

    What was actually found?

    EPA+DHA fell from 2.74 to 1.36 g/100 g; plant fatty acids doubled; wild salmon tested had 0.76 g/100 g.

    How large was the observed effect?

    Double portion needed vs 2006.

    What do the results mean in everyday life?

    Still a rich omega-3 source.

    What are the study's limitations?

    Industry-supplied samples; only 21 wild salmon (mostly Pacific); Scotland only; data to 2015; no funding statement.

    What does it say about Elawady's specific claim?

    Supports decline; contradicts 'benefit disappears'.

    Do the results apply to Germany and Europe?

    High.

    What can explicitly not be concluded from this study?

    Health outcomes; the omega-3:omega-6 ratio figures claimed by the archive.

    Scientific details →

Studies with mixed or unclear results (0)

No studies in this group.

Regional context

Germany / EU

Much farmed salmon sold in Europe is Atlantic salmon; since 2006 its feeds have replaced much fish oil with plant oils (I-FSH-01), which reduces wild-fish inputs.

Egypt

Tilapia is mostly omnivorous; this argument applies less to Egyptian tilapia farming.

What applies in my country?

General scientific assessment

Mostly true Partly correct for carnivorous species in 2000; not a health argument.

The following areas of food safety are relevant to this statement:

  • Veterinary medicines and antibiotics
  • Contaminants (heavy metals, PFAS, PCBs, dioxins, nitrate)
  • Pathogens (Salmonella, Campylobacter, etc.)
  • Animal husbandry and feed

Fish and seafood

Choose a country to see the checked information for it.

Limits: legal rules describe what is allowed, not what every single food contains. Measurement data come from samples and are meaningful only together with their method details.

Country of residence or purchase Compare with another country

References

  1. Effect of aquaculture on world fish supplies.. Naylor RL et al.. Nature 2000 · PMID 10890435 · DOI 10.1038/35016500
  2. Impact of sustainable feeds on omega-3 long-chain fatty acid levels in farmed Atlantic salmon, 2006-2015.. Sprague M et al.. Sci Rep 2016 · PMID 26899924 · DOI 10.1038/srep21892

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