Revealing the Hidden Depths: Supertrawlers and the Push for Transparency in EU Fisheries

Supertrawlers, massive pelagic freezer trawlers exceeding 100 meters in length, dominate high-volume fishing in the Northeast Atlantic, targeting species like mackerel, herring, and blue whiting. These vessels, equipped with advanced sonar, pumps, and automatic grading systems, can process and freeze enormous catches during extended trips at sea. However, their operations raise significant concerns about oversight, particularly regarding illegal, unreported, and unregulated (IUU) fishing practices such as discards and highgrading—discarding lower-value or undersized fish to maximize quotas for premium catches.

New research from the Environmental Justice Foundation (EJF), published on March 10, 2026, spotlights a critical gap: ten EU-linked supertrawlers spent an estimated 14,530 hours fishing in Scottish waters alone from February 1, 2025, to February 1, 2026. This equates to over 1.5 years of continuous effort by these vessels combined, underscoring their intensive presence in shared EU-UK waters. All ten vessels trace ownership back to Dutch fishing conglomerates, with flags from the Netherlands, Germany, Poland, Lithuania, and one UK-flagged ship.

Scotland Leads with Mandatory Remote Electronic Monitoring

Remote Electronic Monitoring (REM)—a system integrating CCTV cameras, sensors, and GPS—has emerged as a game-changer for fisheries compliance. Scotland pioneered its mandatory rollout on March 7, 2026, under the Sea Fisheries (Remote Electronic Monitoring and Regulation of Scallop Fishing) (Scotland) Regulations 2024. Applicable to all relevant pelagic vessels 12 meters or longer fishing in Scottish offshore waters, REM requires multiple high-resolution cameras (at least 2 megapixels, 30 fps, infrared-capable) covering key areas: net deployment zones, processing lines, pump controls, and discard areas. Winch sensors track gear use, while data transmits automatically to secure off-vessel storage every 24 hours.

This step addresses 'high-risk' pelagic freezer trawlers, notorious for potential discards via tank pumping or net openings at sea. Non-Scottish vessels must comply when in Scottish zones, but enforcement gaps persist outside, where flag states like the Netherlands hold responsibility. The UK fitted REM on its largest trawler, the Frank Bonefaas, in 2024, signaling broader momentum.

Spotlight on the Supertrawler Fleet: Dutch Ownership Dominance

The EJF analysis names specific vessels: Annelies Ilena (Polish flag), Maartje Theadora and Helen Mary (German), Willem Van Der Zwan, Afrika, Sch 81 Carolien, and Sch123 Zeeland (Dutch), Margiris (Lithuanian), Alina (Polish), and H72 Frank Bonefaas (UK). All connect to Dutch giants like Parlevliet & van der Plas (P&P), Cornelis Vrolijk, and Van der Zwan—the 'Big Five' controlling much of Europe's pelagic sector. These companies landed over 200,000 tonnes (Dutch) and 100,000 tonnes (German) in 2017-2018 alone, highlighting their scale.

Beyond Scotland, these trawlers logged 7,748 hours in Irish waters, 1,408 in French, and 298 in Dutch zones. Post-Brexit, they frequent UK Marine Protected Areas (MPAs), with 7,380 hours annually reported by Greenpeace. Global Fishing Watch (GFW) AIS data underpins the research, using algorithms to detect fishing effort via speed patterns.

• Annelies Ilena: Infamous for 2013 conviction in Ireland for illegal discarding.
• Margiris: 2022 Bay of Biscay spill investigated amid spill claims, lacking footage verification.

The Shadow of Illegal Discards and Overfishing

Discards undermine the EU's landing obligation (Common Fisheries Policy), concealing true catch volumes and enabling highgrading—estimated losses of hundreds of thousands of euros per trip in juvenile mackerel. Scientific reports cite 30,000 tonnes annual Dutch discards, mostly mackerel and herring. Northeast Atlantic mackerel, a prime target, faces crisis: ICES recommends 70% quota cuts for 2026, yet four coastal states set TAC at 299,010 tonnes, sidelining EU and exceeding advice by 72%.

Over one million tonnes overfished in five years, per MSC warnings. Without REM, patrols can't verify holds, fostering 'control shopping'—shifting to lax jurisdictions. EU audits flag Netherlands and Lithuania for inadequate controls.EJF Policy Brief

Proven Benefits: Lessons from Denmark and Beyond

Denmark's REM in Kattegat Nephrops fishery boosted cod bycatch reporting 878% (2021-2023), aiding discard bans amid stock declines. Cameras deter violations, provide verifiable data for quotas, and support stock assessments. Cost-effective: full coverage at fraction of observer costs. EU Regulation 2023/2842 mandates REM by 2028 for high-risk vessels ≥18m, but pelagic freezer trawlers await classification—EJF urges immediate action.

Interoperability ensures shared EU-UK data via Trade and Cooperation Agreement (TCA), leveling competition for smaller fleets like Scotland's.

Stakeholder Voices: From NGOs to Policymakers

Steve Trent, EJF CEO: “Leaving such vast trawlers unmonitored opens the door to serious unreported fishing... The rest of the UK and EU must follow suit.” EU Commission notes REM feasibility; audits criticize flag states. Fishing associations like Pelagic Freezer-Trawler Association (PFA) represent owners but face transparency calls. Coastal communities fear stock depletion impacting livelihoods.Scottish REM Specs

Greenpeace and Oceana echo demands for MPA protections, banning supertrawlers from sensitive zones.

Regulatory Landscape: EU Control Regulation and Gaps

Regulation (EU) 2023/2842 modernizes controls: VMS for ≥12m vessels, electronic logbooks. High-risk fleets get REM priority, but implementation lags. Post-Brexit, shared stocks demand harmonization. Global Charter for Fisheries Transparency, endorsed by EJF, pushes vessel tracking and catch disclosure.

Broader Implications for Marine Ecosystems and Economies

Accurate data prevents overfishing, aids recovery (e.g., mackerel). REM boosts consumer trust via traceability, aiding Marine Stewardship Council (MSC) certification. Economic: sustainable quotas preserve jobs in research jobs monitoring stocks and policy roles. Challenges: installation costs (18 days for Frank Bonefaas), data privacy, but benefits outweigh via deterrence and revenue from verified quotas.

Photo by Katy Smith on Unsplash

Future Outlook: Towards Harmonized EU-UK Standards

EJF recommends: classify pelagic freezer trawlers high-risk, mandate REM pre-2028, foster interoperability. With CFP evaluation in 2026, momentum builds. Researchers in marine biology and policy can contribute via GFW data analysis. For careers in sustainable fisheries, explore higher ed jobs in Europe.

In conclusion, this research underscores REM's role in transparent, sustainable fishing. Policymakers must act to protect shared resources. Stay informed via Europe higher ed news and career advice.