The Hidden Risks of Ethoxyquin in the Global Seafood Supply Chain
How a maritime fire retardant became a controversial additive in farmed fish feed.
1Maritime Safety Crisis
Between the 1950s and 1970s, fishmeal shipments frequently suffered from spontaneous combustion during transit. Over 90 ship and warehouse fires were recorded, causing significant financial losses and human casualties. The industry faced an urgent operational crisis, as the dark yellow powder oxidized rapidly, creating a dangerous environment for seafarers and insurers.
2The Ethoxyquin Solution
In 1967, Cargill introduced ethoxyquin, an antioxidant previously used for rubber and fruit preservation, to stabilize fishmeal. The chemical proved highly effective, reducing annual ship fires from 16 to five by the 1970s. Consequently, the U.S. Coast Guard and international maritime bodies mandated its use to ensure safe global cargo transport.
3Emerging Health Concerns
Despite its fire-retardant success, ethoxyquin was identified as a potential carcinogen as early as 1969. Research on laboratory animals showed severe damage, and a 2015 European Food Safety Authority report highlighted that p-phenetidine, an impurity in the chemical, could cause genetic mutations. These findings triggered widespread regulatory scrutiny across international food markets.
4Regulatory Divergence
The European Union suspended ethoxyquin authorization in 2017, leading to bans in the U.K., Norway, Iceland, and Liechtenstein. Conversely, markets including the U.S., Japan, and South Korea continue to permit its use within specific limits. This regulatory fragmentation complicates global supply chain compliance for seafood companies operating across multiple international jurisdictions.
5Legal and Labeling Battles
Seafood companies have faced multiple class-action lawsuits regarding the marketing of products as sustainable. Plaintiffs argued that labeling fish as sustainable while using ethoxyquin-treated feed is misleading. Major retailers like Aldi and Gorton’s settled out of court, reflecting the growing consumer and legal pressure surrounding chemical additives in the aquaculture industry.
6Inspection and Oversight Gaps
Regulatory oversight remains inconsistent, as evidenced by a 2024 audit of the Canadian Food Inspection Agency. The audit revealed that only 40 percent of planned inspections were completed, citing systematic under-delivery. Furthermore, agencies often lack protocols to test whether ethoxyquin residues actually transfer from fish feed into the final seafood products consumed.
7Transition to Alternatives
Producers are shifting toward alternatives like rosemary extract, vitamin E, or butylated hydroxyanisole (BHA). While BHA is cost-effective, it also carries health risks, as the U.S. National Toxicology Program identified it as a potential human carcinogen. The industry continues to struggle with finding safe, effective, and scalable antioxidants for fishmeal.
8Future of Aquaculture Sustainability
The aquaculture sector faces a persistent dilemma: balancing the need for stable, non-combustible feed with the health risks of chemical additives. As global seafood demand grows, the industry must move beyond reactive safety measures. Future sustainability depends on developing truly inert alternatives or fundamentally changing how carnivorous fish are raised in farms.
Original article: Grist — The Hidden Risks of Ethoxyquin in the Global Seafood Supply Chain