Forced labor in tuna fishing: a hidden supply chain liability
Forced labor in fishing is not a fringe issue. Reports from organizations tracking human rights at sea consistently point to the tuna sector as one of the highest-risk areas in global seafood. Vessels operating in remote ocean zones, long trips without port calls, and complex ownership structures can all create conditions where labor abuses go unnoticed for months or even years.
The challenge for buyers, brands, and retailers is that most of this risk is invisible at the point of purchase. By the time tuna reaches a processing facility or a retail shelf, the evidence of what happened at sea may already be buried under layers of paperwork, intermediaries, and manual records. Knowing what to look for at the supply chain level can help you identify where your exposure may be highest.
1: Vessels operating without AIS or VMS signals
A fishing vessel that goes dark on tracking systems is one of the clearest warning signs of potential labor abuse. Automatic Identification System (AIS) and Vessel Monitoring System (VMS) data give supply chain partners a continuous record of where a vessel has been, how long it stayed in certain areas, and whether its movements match the catch it later reports.
Vessels that disable or manipulate these signals may be attempting to hide their location, avoid monitoring by Regional Fishery Management Organizations (RFMOs), or operate in restricted zones. This kind of behavior correlates with a broader pattern of non-compliance that can extend to how crew members are treated on board.
If your supplier cannot provide continuous, verifiable satellite tracking data for the vessels in your supply chain, that gap alone may warrant a closer look. Reliable satellite VMS and AIS coverage should be a baseline expectation, not a bonus feature.
2: Extended time at sea with no port calls
Transshipment at sea, where catch is transferred from fishing vessels to carrier vessels without returning to port, is a common practice in tuna fishing. It allows vessels to stay out for months at a time, which significantly reduces oversight opportunities and increases the risk that crew members cannot leave, report abuse, or access medical care.
Extended at-sea operations are not automatically a sign of wrongdoing, but they do raise the question: what is the crew welfare situation on board during these periods? Are there observer reports, electronic monitoring (EM) records, or social audit data covering these trips? If the answer is no, you may be looking at a meaningful blind spot in your supply chain.
Buyers sourcing from vessels with long at-sea durations should ask suppliers for documentation that covers the full trip, not just the port arrival. The absence of that documentation is itself informative.
Book a demo3: Missing or unverifiable crew documentation
Crew documentation covers a range of records: employment contracts, seafarer identity documents, wage records, and evidence of voluntary recruitment. When these documents are missing, incomplete, or cannot be independently verified, it may indicate that proper hiring and employment processes were not followed.
Debt bondage and recruitment fees are among the most common mechanisms used to trap workers in forced labor situations. Workers who paid excessive fees to secure a position on a vessel may effectively be working to pay off that debt, with no realistic ability to leave. Without proper documentation, there is no way to confirm that crew members were recruited ethically or are being paid fairly.
Social compliance frameworks such as the FISH Standard for Crews, SMETA, and Fair Trade USA provide structured approaches to verifying crew welfare. If your supply chain partners cannot point to any of these or similar verified standards, that is a gap worth addressing.
4: No social audit trail for processing facilities
Labor risk in tuna supply chains does not stop at the vessel. Processing facilities, particularly in regions where tuna is landed and prepared for export, can also be sites of labor exploitation. Workers in these facilities may face excessive hours, unsafe conditions, wage theft, or restricted freedom of movement.
A social audit trail, covering certifications like BSCI/Amfori, SEDEX/SMETA, or similar frameworks, provides documented evidence that a facility has been assessed against recognized labor standards. Without this trail, buyers are essentially taking a supplier’s word for it that conditions are acceptable.
The absence of any social audit history for a processing facility should prompt questions. When were the last audits conducted? By whom? Were findings remediated? If a supplier struggles to answer these questions, that is a signal that social compliance may not be systematically managed.
5: Catch origin data that doesn’t add up
Inconsistencies in catch origin data, such as reported catch volumes that do not match vessel capacity, species compositions that seem unusual for a given fishing zone, or landing dates that conflict with vessel tracking records, can indicate that fish from undisclosed sources has been mixed into a shipment.
This matters for forced labor risk because IUU (illegal, unreported, and unregulated) catch and labor abuse often go hand in hand. Vessels operating outside legal frameworks are also less likely to comply with crew welfare standards. If the catch data does not hold up to scrutiny, the labor conditions behind that catch may not either.
Cross-referencing catch data against RFMO registries, ISSF positive vessel records, and vessel tracking histories is one way to identify these inconsistencies before product moves further down the chain.
6: Gaps in first-mile traceability records
First-mile traceability refers to the capture of data at the point where fish first enters the supply chain, typically at port discharge or during at-sea transshipment. This is the moment when origin, vessel identity, catch method, and initial compliance information should be recorded and linked to a specific batch of product.
When first-mile records are absent or incomplete, everything that follows in the supply chain is built on an unverified foundation. A processor may have excellent documentation for what happened inside their facility, but if they cannot trace the raw material back to a specific vessel, trip, and fishing zone, their records only tell part of the story.
Gaps at the first mile are especially problematic because they are the hardest to reconstruct after the fact. Once fish has been processed and mixed with other batches, the opportunity to verify origin data at the source is largely gone. Traceability systems that start at processing rather than at catch are structurally limited in what they can prove.
7: Reliance on paper-based or self-reported compliance
Paper-based documentation and self-reported compliance data are among the weakest forms of evidence in any supply chain risk assessment. They are easy to falsify, difficult to verify at scale, and prone to gaps simply through poor record-keeping. In high-risk supply chains, relying on them creates significant exposure.
Self-reported catch forms, manually completed crew records, and paper certifications that have not been cross-checked against independent databases may look like compliance on the surface. But without digital verification, automated cross-referencing, and independent audit trails, they offer limited protection if a problem later surfaces.
Jurisdictions such as the EU and the USA are increasingly requiring digital, verifiable documentation for seafood imports. Companies that still rely primarily on paper-based systems could face compliance challenges as these requirements become more stringent in 2026 and beyond.
Turning red flags into verifiable proof of clean supply chains
Identifying these warning signs is a useful starting point, but the goal is to move from risk awareness to verifiable proof. That means building systems that capture data at the first mile, link social compliance evidence to specific batches, and allow you to answer a regulator’s or retailer’s questions with documented facts rather than supplier assurances.
SmarTuna’s digital traceability platform is designed to do exactly that. It captures real-time vessel data via satellite VMS and AIS, assigns unique Raw Material IDs at port discharge, integrates social compliance certifications directly into each batch record, and automates checks against more than 15 regulatory and certification databases. The result is a supply chain where forced labor risks in fishing can be identified, documented, and addressed before they become a liability for your brand, your buyers, and the people in your supply chain who matter most.
Frequently Asked Questions
How do I get started with assessing forced labor risk in my tuna supply chain?
Start by mapping your supply chain from the first mile — identifying every vessel, transshipment point, and processing facility your product passes through. Then request documentation for each node: satellite tracking records, crew compliance certifications, and social audit reports. If your current suppliers cannot provide this information, that gap itself tells you where your highest-risk exposure is and where to prioritize due diligence efforts first.
What's the difference between AIS and VMS, and do I need both?
AIS (Automatic Identification System) is a publicly broadcast signal that any receiver can pick up, while VMS (Vessel Monitoring System) is a closed, government-monitored system typically required by fisheries regulators and RFMOs. AIS can be switched off by the vessel operator, making it less reliable on its own, whereas VMS is harder to manipulate and provides a more authoritative record. For robust supply chain due diligence, cross-referencing both data sources is considered best practice, as discrepancies between the two can themselves be a red flag.
What if my supplier has certifications but I still have concerns about their vessels?
Facility-level certifications like SMETA or BSCI only cover conditions inside a processing plant — they do not extend to the vessels that supplied the raw material. It’s entirely possible for a certified facility to be sourcing from vessels with serious labor compliance gaps. Ask your supplier to demonstrate vessel-level compliance separately, including crew documentation, social audits specific to fishing operations (such as the FISH Standard for Crews), and verifiable satellite tracking records for the trips supplying your product.
How does IUU fishing connect to forced labor risk, and why should brands care?
IUU (illegal, unreported, and unregulated) fishing and forced labor are closely correlated because both thrive in environments with weak oversight and regulatory evasion. Vessels that operate outside legal fishing frameworks have little incentive to comply with crew welfare standards either. For brands, the reputational and legal risk is compounded: sourcing IUU product can trigger import bans and regulatory penalties, while associated labor abuses can generate significant media and NGO scrutiny. Treating IUU risk and forced labor risk as separate issues understates the exposure.
What are the most common mistakes companies make when trying to address forced labor risk in seafood?
The most common mistake is treating supplier questionnaires or self-reported declarations as sufficient evidence of compliance. Other frequent missteps include auditing only processing facilities while ignoring vessel-level risk, relying on certifications that have lapsed or were issued without independent verification, and failing to trace product back to specific vessels and fishing trips. Effective forced labor due diligence requires data that is independently verifiable, digitally recorded, and linked to the specific batch of product — not just general assurances about a supplier’s practices.
What regulations should seafood buyers and brands be preparing for in 2026 and beyond?
The EU’s Supply Chain Due Diligence Directive (CSDDD) and the strengthened EU IUU Regulation are both moving toward more rigorous digital documentation requirements for seafood imports. In the US, Customs and Border Protection has increasingly used Withhold Release Orders (WROs) to block seafood imports linked to forced labor, and the Uyghur Forced Labor Prevention Act has raised the bar for supply chain documentation. Companies that invest now in digital traceability and verifiable social compliance records will be significantly better positioned to meet these requirements as enforcement tightens.
Can small or mid-sized seafood companies realistically implement this level of traceability?
Yes — and the business case for doing so is growing stronger. Digital traceability platforms have become more accessible and scalable, meaning companies don’t need to build custom systems from scratch. Many platforms can integrate with existing supplier relationships and ERP systems, and the cost of implementation is increasingly offset by reduced audit burden, faster response to retailer inquiries, and protection against the financial and reputational costs of a forced labor incident. Starting with your highest-volume or highest-risk supply chains and expanding from there is a practical approach for companies with limited resources.