Friend of the Sea and the Ornamental Fish Trade: What a Conscious Aquarist Should Know

In 30 seconds: 90% of marine ornamental fish come from wild collection; Friend of the Sea is a certification that audits origin and chain of custody; as a buyer, ask where the fish comes from, look for the logo with discernment, and prioritize captive-bred specimens.

The Invisible Price of Every Fish That Enters Our Aquarium

Industry estimates suggest that each year more than two billion ornamental aquatic specimens, including fish, corals, crustaceans, mollusks, plants, and live rock, change hands globally¹. By number of individuals, it may be the largest living wildlife trade on the planet, and the final consumer sees little of it. When we buy a clownfish or an anemone at a local store, we rarely ask which reef it came from, whether cyanide was used to catch it, or whether its harvest is contributing to the decline of an already vulnerable population.

Aquarium keeping, at its best, is a doorway to the beauty of marine life. At its worst, it feeds an opaque supply chain that destroys reefs and endangers coastal communities that depend on them. The good news is that there are tools to tell one from the other. One of them is the Friend of the Sea (FOS) certification.

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What Is Friend of the Sea?

Friend of the Sea is an international NGO founded in 2008 and recognized as one of the leading certification standards for products and services linked to the marine environment². Although most people know it from its labels on seafood and aquaculture products, for years now FOS has also operated two programs specific to the ornamental sector: certification of sustainable public aquariums and certification of ornamental species (aquarium fish, corals, and invertebrates)³.

The standard for public aquariums requires 100% compliance with essential criteria⁴:

• Written environmental policy, signed by management.
• Animal welfare: staff training, species-specific nutrition plans, water quality records for the last 12 months, and documented quarantine areas.
• Controlled provenance: all corals must come from coral farms; animals may only come from closed-cycle hatcheries or FOS-certified fisheries. If not, the facility must formally commit to doing so in the future.
• Education and conservation: scientific information next to every exhibit, at least two educational activities per year (one for children and one for adults), and participation in aquatic species conservation programs.
• Waste management and water recirculation.
• Social responsibility: compliance with ILO conventions on child and forced labor.

For ornamental species, the standard covers both wild collection and captive production, and includes a Chain of Custody audit to trace origin from the reef or farm to the point of sale³. If a fish carries the FOS logo, an independent certification body has assessed its capture or cultivation against environmental sustainability and social responsibility criteria.

Who Is Already Certified?

The first emblematic case was Walt Smith International, based in Fiji, which became the first company to obtain FOS certification for sustainable ornamental production³. Its model combines regulated harvesting with local farm cultivation, showing that the ornamental trade can generate income for low-resource coastal communities without destroying the reefs that sustain them.

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The Numbers of the Ornamental Trade

To understand the value of a certification, it helps to look first at the problem it aims to solve.

The European Union, Epicenter of Regulated Trade

Between 2014 and 2021, the EU imported 25.5 million marine ornamental fish specimens, with an average annual value of €24 million⁵. The main exporting countries were Indonesia (43.7% of volume), the Philippines (16.6%), and Sri Lanka (8.4%). Italy was the fourth largest EU importer, receiving 2.6 million specimens during that period⁵.

The EU control system, TRACES, shows an alarming gap: one in three imported specimens lacks species-level identification⁵. Authorities, researchers, and consumers often cannot know which fish is crossing the border, let alone whether it comes from a sustainable fishery or a destructive operation.

The U.S. Market: Even More Concerning

A study published in Conservation Biology in October 2025 analyzed four large online marine fish retailers in the United States, the world’s largest market in this sector. Of 734 species for sale, 665 (approximately 89%) were consistently sold as wild-caught⁶. Among them were 13 threatened species according to the IUCN and 26 species with declining population trends⁶.

The Banggai cardinalfish (Pterapogon kauderni), for example, appeared in commercial catalogs despite being classified as Endangered⁶. The clownfish (Amphiprion ocellaris), a symbol of modern aquarism, is still wild-caught around Indonesia to meet demand, even though captive production now exists.

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Cyanide and Destructive Methods

Although most exporting countries ban cyanide fishing, researchers still document it in the ornamental industry⁷. Fishers dissolve sodium cyanide tablets in plastic bottles, submerge them near reefs, and wait for the poison to stun fish into easy capture. The practice kills non-target species, damages coral, and leaves many captured fish dead before they ever reach a home aquarium⁸.

Export controls and aquaculture have reduced the practice in some regions, but enforcement has not eradicated it.

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The Alternative: Aquaculture and Rising Tide Conservation

If Friend of the Sea tries to make existing practices sustainable, Rising Tide Conservation tries to create an alternative. Founded in 2009 by SeaWorld Parks & Entertainment, this program funds academic research to develop protocols for culturing marine ornamental fish⁹.

Until recently, hatcheries had captive-bred only a small percentage of commercially traded marine aquarium species⁹. Rising Tide works with universities, public aquariums, specialty stores, and private breeders to increase that number. It has made advances in difficult pelagic species, such as the Banggai cardinalfish and several Bodianus species⁹.

Its motto, “A rising tide lifts all boats,” captures a collaborative vision: aquarism can reduce pressure on reefs when it prioritizes cultivation over wild collection and transparency over opacity.

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The Limits of Private Certifications

No certification, FOS included, is a panacea. Friend of the Sea is a private NGO, not an intergovernmental body like the FAO or IUCN. Its funding comes partly from certification fees paid by the companies being audited, which raises independence questions debated in environmental governance literature. Competing certifications such as ASC or MSC operate with greater visibility in industrial fishing and food aquaculture, but so far they do not cover the ornamental niche with the same depth.

This does not invalidate FOS’s work: it means the logo should be read as a useful filter, not an absolute guarantee. The consumer remains the final checkpoint.

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Practical Guide for the Conscious Aquarist

Certifications and research programs help, but the buyer still decides. Apply that responsibility at the aquarium store:

1. Ask About Origin

Ask directly. Is this fish captive-bred or wild-caught? Which country does it come from? If the clerk does not know, that opacity is a warning sign, not an excuse.

2. Look for the Logo, but Use Judgment

The Friend of the Sea label indicates that an independent certification body has audited the supply chain. It is one of the few certifications that covers the ornamental trade with periodic audits². Do not confuse it with a generic “sustainable product” logo with no certifying agency behind it.

3. Prioritize Captive-Bred Species

Clownfish (Amphiprion ocellaris), various gobies, and cardinals are already commercially produced in hatcheries. Buying captive-bred specimens directly reduces pressure on wild reefs. If a species is not available as captive-bred, ask whether you need that fish or whether a captive-bred alternative meets your goal.

4. Be Wary of Suspiciously Low Prices

A fish caught with low-cost practices is cheaper to obtain than one raised in an aquaculture facility for months. If the price seems too good to be true, the planet is paying the difference.

5. Support Transparent Initiatives

Some online retailers now label products as “captive bred” or “sustainably collected.” That transparency deserves recognition and consumer preference.

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What Has to Change

The researchers who analyzed the ornamental trade in the U.S. reached an uncomfortable conclusion: if global warming continues at its current pace, aquaculture may become the only viable source for ornamental fish, because coral reefs will not survive as capture habitats⁶.

This projection comes from ocean temperature data and coral bleaching rates. Aquarism has to change; the open question is whether it will change in time.

Friend of the Sea, Rising Tide Conservation, TRACES in Europe, and retailer efforts to label origin are useful steps. No certification replaces consumer curiosity. A conscious aquarist does not give up beauty; they make sure beauty does not destroy what it admires.

When was the last time you asked where a fish came from before taking it home?

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Sources

Footnotes

1. Industry estimates based on Friend of the Sea data and reviews of the ornamental organism trade. The exact figure varies by source; FOS cites “more than 2 million” ornamental fish annually, while the expanded figure of billions includes corals, invertebrates, plants, and live rock. ↩

2. Responsibly. “What is Friend of the Sea — Sustainable Aquaculture Certification.” responsibly.tech, 2024. Link ↩ ↩²

3. Friend of the Sea. “Sustainable Aquaria & Ornamental Fish Trade Certification.” friendofthesea.org, 2024. Link ↩ ↩² ↩³

4. Friend of the Sea. Sustainable Aquarium Standard, Rev. 1. April 17, 2019. PDF ↩

5. Biondo, M., et al. “An Updated Review of the Marine Ornamental Fish Trade in the European Union.” Animals, vol. 14, no. 12, 2024, 1761. PMC11201242. DOI: 10.3390/ani14121761 ↩ ↩² ↩³

6. Lin, B., et al. “Extent of threats to marine fish from the online aquarium trade in the United States.” Conservation Biology, 2025. DOI: 10.1111/cobi.70155. Summary on Mongabay: Link ↩ ↩² ↩³ ↩⁴

7. Cefas. “UK ornamental aquatics industry join forces with scientists in the race to find a robust solution to illegal cyanide fishing.” cefas.co.uk, 2024. Link ↩

8. Barber, C. V., & Pratt, V. R. “Sullied Seas: Strategies for Combating Cyanide Fishing in the Indo-Pacific and Beyond.” World Resources Institute, 1998. Cited in academic review on cyanide fishing in bioRxiv (2024). Link ↩

9. Rising Tide Conservation. “Saving the Ocean One Fry at a Time.” risingtideconservation.org, 2024. Link ↩ ↩² ↩³