How Regional Fisheries Management Organisations Actually Function
Fish do not respect borders. A tuna spawned in the Mediterranean may be caught off Norway, and a skipjack tagged near the Solomon Islands may end up in a net a thousand miles away. This creates a governance problem with no obvious solution, because the fish that matter most commercially spend much of their lives in waters no country owns, or move between the waters of many. No single state can manage them, and if each simply fishes as hard as it likes, the stock collapses and everyone loses. The answer the world arrived at is the Regional Fisheries Management Organisation, a treaty-based body through which states with interests in a shared stock agree to manage it together. Around seventeen of these organisations now govern fishing across the high seas. They are the closest thing the ocean has to a fisheries government, and their record is genuinely mixed in ways worth understanding precisely. Here is how they work, step by step.
1. Countries Create the Organisation
An RFMO begins as a treaty. States with fishing interests in a particular ocean region, together with the coastal states of that region, negotiate a convention establishing an organisation with a defined geographic area of competence and a defined set of species. Some are species-specific, such as the Commission for the Conservation of Southern Bluefin Tuna, which manages a single fish across its entire range. Others cover a region and everything commercially significant within it.
What distinguishes an RFMO from the many other international fisheries bodies is authority. RFMOs can adopt conservation and management measures that are legally binding on their members, which most advisory bodies cannot. Their legal foundation comes from UNCLOS and, more specifically, from the 1995 United Nations Fish Stocks Agreement, which obliges states fishing for straddling and highly migratory stocks on the high seas either to join the relevant RFMO or to apply its measures anyway. In principle this closes the free-rider problem. In practice, as we will see, the closure is imperfect.
2. Scientists Assess the Stocks
Every RFMO has a scientific committee that gathers catch and effort data from member fleets, conducts surveys, runs stock assessments, and estimates whether fishing pressure is sustainable. The assessments produce the central numbers on which everything else depends: how much biomass remains, whether the stock is above or below the level that supports maximum sustainable yield, and how much can be taken next year without depleting it further.
The convention requires that management decisions rest on the best available scientific information, and the quality of these scientific committees is generally high. The critical structural feature, though, is that the scientists advise and the politicians decide. Nothing obliges a commission to adopt the catch limit its own scientists recommend, and the gap between scientific advice and agreed quotas is where much of the criticism of RFMOs concentrates. The science is rarely the weak link.
3. Members Negotiate the Rules
Member states meet, usually annually, to negotiate conservation and management measures. These can include total allowable catches, fishing seasons, closed areas, gear restrictions, minimum sizes, bycatch rules, and limits on fishing effort or vessel numbers.
Here sits the deepest structural problem in the whole system. Most RFMOs decide by consensus, which means any single member can block a measure. Researchers writing in Science have described this model as failing, and the criticism is that consensus produces the lowest common denominator, delays urgent decisions, and allows one state, however small, to hold an entire negotiation hostage. Even where voting exists, most conventions contain an objection procedure allowing a member to opt out of a measure it dislikes, and several go further still, with provisions under which a measure loses its binding force entirely if enough members object. The consequences are concrete: Indian Ocean yellowfin tuna has been assessed as overfished, and a proposed rebuilding plan was objected to by six countries.
One organisation has tried to fix this. The South Pacific RFMO, one of the newest, allows measures to be adopted by three-quarters majority and to bind all parties, permits objections only on narrow grounds such as unjustifiable discrimination or inconsistency with international law, requires an objecting state to adopt equivalent alternative measures, and triggers an automatic review panel to test whether the objection meets those conditions. It is widely cited as the model other RFMOs should adopt, and the fact that it remains exceptional says a good deal about the pace of institutional reform.
4. Catch and Fishing Opportunities Are Allocated
Once a total allowable catch is agreed, it has to be divided. Members negotiate quota shares, vessel limits, effort caps, or other allocations designed to keep total fishing within the sustainable level.
Allocation is consistently the hardest part of any RFMO negotiation, and it is worth understanding why. Setting a scientifically defensible total is a technical exercise; dividing it is a purely distributive one, in which every additional tonne for one member is a tonne less for another. Historical catch records favour long-established distant-water fleets, while developing coastal states argue for shares reflecting the fact that the fish spend time in their waters and that they have a right to develop their own fisheries. These arguments recur at every meeting and rarely resolve cleanly. When agreement on allocation proves impossible, the common outcome is not a smaller total but a larger one, since expanding the pie is easier than dividing it fairly.
5. Vessels Have to Follow the Rules
RFMOs do not police vessels directly. Measures are implemented by member states through their own national laws, licences, and enforcement agencies, and it is flag states that are responsible for ensuring their vessels comply with reporting, vessel-list, observer, inspection, and monitoring requirements.
This dependence on flag states is the same vulnerability that runs through all maritime governance. An RFMO measure is only as effective as the willingness and capacity of the flag state to enforce it, and vessels flagged to states with weak oversight, or to states that have joined nothing at all, sit largely outside the system. RFMOs have responded by building leverage that does not depend on the flag, principally through authorised vessel lists, which function as a licence to operate, and through port and market measures that make it difficult to land or sell fish caught outside the rules.
6. Fishing Activity Is Monitored
Monitoring, control, and surveillance combine several tools: satellite vessel monitoring systems that track position, catch documentation schemes that follow fish through the supply chain, onboard observers, at-sea and in-port inspections, and information sharing between members. RFMOs also maintain lists of authorised vessels and of vessels suspected of illegal, unreported, and unregulated fishing.
The technology has improved dramatically, but coverage has not kept pace with capability. Observer coverage in industrial tuna fisheries remains far below full, and electronic monitoring, which uses onboard cameras to substitute for human observers at lower cost, has been slow to become mandatory. At ICCAT's 2025 annual meeting, prolonged argument over bluefin quotas crowded out progress on exactly these issues, with conservation groups noting that the commission made little headway on electronic monitoring and observer coverage. Transparency is a related concern: the Western and Central Pacific Fisheries Commission, which oversees more than half the world's tuna catch, has conducted part of its annual compliance review behind closed doors, a practice critics argue is incompatible with stewardship of a shared public resource.
7. Violations Can Trigger Action
When rules are broken, the available responses include investigation, listing the vessel on an IUU register, restricting access to fishing grounds or ports, and referral to the flag state or other authorities for prosecution.
The IUU vessel list deserves particular attention, because it is the sharpest tool most RFMOs possess. Listing does not require anyone to arrest a ship. It simply names it, and because RFMOs share their lists, a listed vessel finds itself progressively locked out of ports, markets, insurance, and fuel across large parts of the world. It is enforcement by exclusion rather than by force, which suits a system with no police of its own. The limitation is that a vessel can change its name and its flag, and the same operator can reappear under a new identity, which is why beneficial ownership transparency has become such a live issue in fisheries governance.
8. The Rules Are Reviewed and Updated
Stocks change, science improves, and fishing patterns shift, so RFMOs revisit their measures regularly. They also conduct periodic performance reviews assessing their own effectiveness against agreed criteria, an exercise the five tuna RFMOs agreed to undertake on a common basis, typically taking about a year and costing tens of thousands of dollars each time.
The more significant reform has been the move toward management procedures, sometimes called harvest strategies. Rather than renegotiating a quota every year, members agree in advance on a rule that automatically converts the latest stock assessment into a catch limit, with the response to different stock conditions pre-agreed. The advantage is that it removes the annual political haggling and builds in a precautionary response to uncertainty. ICCAT has adopted management procedures for Atlantic bluefin, northern albacore, North Atlantic swordfish, and, in November 2025, western Atlantic skipjack, and is generally regarded as leading the tuna RFMOs in this transition. Where a management procedure is in place, science drives the number rather than merely informing the argument about it.
The Honest Balance Sheet
The criticisms of RFMOs are real and well documented, but the record is not one of uniform failure, and the counter-evidence is substantial. Eastern Atlantic and Mediterranean bluefin tuna, on the brink of commercial collapse around the turn of the century, was placed under an ICCAT recovery plan in 2006 with sharply reduced quotas, shorter seasons, larger minimum sizes, and a ban on spotter planes, and by 2017 assessments showed the stock no longer overfished. It is now healthy enough that quotas have been raised again. Pacific bluefin, similarly depleted, reached its second rebuilding target in 2021, thirteen years ahead of schedule, through cooperation between the two Pacific tuna commissions. Across the twenty-three major commercial tuna stocks, the International Seafood Sustainability Foundation reported in January 2026 that 97 percent of the global tuna catch comes from stocks at healthy abundance levels, that no stocks are currently classified as overfished, and that 96 percent are not experiencing overfishing, with abundance improving nine percentage points in under a year.
The fair conclusion is that RFMOs work when their members want them to, and stall when even one member does not. The institutional weaknesses, consensus decision-making, objection procedures, allocation deadlock, dependence on flag states, and patchy transparency, are genuine and largely fixable, as SPRFMO's constrained objection procedure and ICCAT's management procedures both demonstrate. What is striking is that a system with no police force, no court of its own, and no power to compel anyone has nonetheless brought some of the most valuable and most heavily fished species on earth back from the edge. That is a low bar in one sense and a remarkable achievement in another.
Did You Know?
RFMOs matter most for straddling and highly migratory fish stocks, meaning populations that cross national boundaries or live in waters beyond any national jurisdiction, which is exactly the category that ordinary domestic fisheries law cannot reach. The 1995 United Nations Fish Stocks Agreement provides the international framework obliging states to cooperate through these organisations, and it did something unusual in international law by making membership effectively conditional on access: a state that will not join the relevant RFMO or apply its rules has no right to fish the stock it manages. Whether that principle can be enforced against a determined outsider remains the open question at the heart of high seas fisheries governance.
Note: This article reflects the state of regional fisheries management as of mid-2026, drawing on sources including the FAO, the United Nations, ICCAT, the International Seafood Sustainability Foundation, NOAA Fisheries, and peer-reviewed fisheries governance research. Stock status assessments are updated regularly and vary by species and ocean basin.
