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

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; I-FSH-118 (Majluf 2024: carnivorous aquaculture consumes most of the world's fishmeal and fish oil; the FIFO metric understates wild-fish use).

6. Which studies contradict it?

A-FSH-19 (overall conclusion), I-FSH-01, I-FSH-114 (Naylor 2021: fish-in-fish-out ratio lowered for all fed species, though dependence on marine ingredients persists).

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

26 October 2026 provisional

Scientific evidence in detail

True only under certain conditions – The claim holds only for certain doses, groups of people, preparations or circumstances.

Research question: Does farming carnivorous fish deplete wild fish stocks used as feed rather than relieve pressure on the oceans?

Study results as reported by the authors. Our assessment follows below.

Open questions

Species-level net balance.

How deeply was this checked?

4 linked studies: 1 checked in full text (1 of them with a structured risk-of-bias assessment), 3 on the basis of the abstract, 0 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.

Last scientific review: 26 October 2026

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

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.

• Antimicrobial use in food animals and antibiotic growth promoters
• Hormones in poultry, meat, milk and farmed fish
• Dioxins, PCBs and PFAS in eggs and other animal foods
• Heavy metals in fish
• Farmed fish (aquaculture): drugs, water source and controls
• Import controls and the meaning of RASFF notifications for Egyptian products

What applies in my country?

General scientific assessment

Mostly true Largely correct for carnivorous species such as salmon and shrimp, which still depend on wild forage fish despite better feed efficiency; this is an environmental, 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

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. A review of the global use of fishmeal and fish oil and the Fish In:Fish Out metric.. Majluf P et al.. Sci Adv 2024 · PMID 39413173 · DOI 10.1126/sciadv.adn5650
3. 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
4. A 20-year retrospective review of global aquaculture.. Naylor RL et al.. Nature 2021 · PMID 33762770 · DOI 10.1038/s41586-021-03308-6