Introduction: From Freedom of Fishing to Cooperative Fisheries Governance

The regulation of fisheries beyond national jurisdiction has long occupied a contentious position in the development of public international law. For centuries, the high seas were understood through the lens of Mare Liberum, a space defined principally by the freedoms of navigation and fishing. This conception was progressively challenged as technological developments in the nineteenth and twentieth centuries transformed fishing from a predominantly local or artisanal activity into an increasingly industrial enterprise. The resulting expansion in fishing capacity demonstrated that marine living resources, despite their apparent abundance, were neither inexhaustible nor immune to overexploitation.

The evolution of international fisheries law therefore reflects a broader transformation in the law of the sea: from a legal order centered primarily on freedom toward one increasingly characterized by cooperation, conservation, scientific management, and environmental responsibility.

The United Nations Convention on the Law of the Sea (UNCLOS), adopted in 1982, represents the principal legal foundation of this transformation. It established a comprehensive framework governing fisheries within exclusive economic zones (EEZs) and on the high seas. Yet UNCLOS did not attempt to create a single centralized international fisheries authority. Instead, it relied extensively upon cooperation among states and, where appropriate, through regional and subregional organizations.

Regional Fisheries Management Organizations (RFMOs) consequently occupy a distinctive position in contemporary international law. They are neither ordinary intergovernmental organizations nor merely technical fisheries agencies. They constitute institutional mechanisms through which states collectively exercise rights and discharge obligations arising under UNCLOS and subsequent fisheries agreements.

Their significance has expanded further as modern fisheries governance has come to incorporate the precautionary approach, ecosystem-based management, bycatch reduction, protection of vulnerable marine ecosystems, scientific monitoring, vessel monitoring, port-state measures, and increasingly sophisticated compliance systems.

RFMOs therefore stand at the intersection of state sovereignty, freedom of the high seas, conservation obligations, scientific governance, and international institutional law.

This article examines the legal role of RFMOs, their mandates, institutional authority, relationship with non-members, enforcement mechanisms, interaction with UNCLOS and the 1995 UN Fish Stocks Agreement, and their contribution to the development of contemporary international fisheries law. It also examines the principal limitations of the RFMO system and considers whether regional fisheries governance can adequately respond to increasingly globalized fishing activity and transboundary marine ecosystems.

1. What Is the Mandate of RFMOs?

The mandate of Regional Fisheries Management Organizations is derived from a layered legal architecture.

At the apex sits UNCLOS, which establishes general obligations concerning the conservation and management of living marine resources. Articles 61 and 62 establish the principal framework for fisheries within the EEZ, while Articles 116–119 address high-seas fisheries.

UNCLOS requires states to cooperate in the conservation and management of living resources that occur beyond national jurisdiction or migrate between maritime zones.

Article 63 is particularly significant because it requires coastal states and states fishing for the same stocks in areas adjacent to the EEZ to seek agreement, directly or through appropriate subregional or regional organizations, concerning conservation and management measures.

For highly migratory species, Article 64 goes further by requiring coastal states and other states whose nationals fish in the region to cooperate directly or through appropriate international organizations with a view to ensuring conservation and promoting the objective of optimum utilization.

UNCLOS thus provides the constitutional framework, but it leaves substantial operational responsibility to regional and subregional institutions.

The 1995 Agreement for the Implementation of the Provisions of UNCLOS relating to the Conservation and Management of Straddling Fish Stocks and Highly Migratory Fish Stocks, commonly known as the UN Fish Stocks Agreement, significantly elaborated this framework.

The Agreement operationalized the concept of a regional fisheries management organization or arrangement (RFMO/As) and established detailed obligations concerning:

• cooperation;

• compatible conservation measures;

• precautionary management;

• ecosystem considerations;

• scientific advice;

• compliance;

• enforcement;

• data collection;

• boarding and inspection;

• dispute settlement; and

• participation of non-members.

The mandate of an individual RFMO, however, remains dependent upon its constitutive treaty.

This produces an important distinction between the general international legal mandate of fisheries cooperation and the specific institutional competence of a particular RFMO.

An RFMO cannot necessarily regulate every marine species or every environmental activity occurring within its geographical area. Its authority depends upon the treaty establishing it and subsequent decisions adopted under that treaty.

2. RFMOs as Institutions of International Law

RFMOs possess a distinctive legal personality within the international system.

They are established by international agreements and generally possess permanent institutional structures, including:

• commissions;

• scientific committees;

• compliance committees;

• secretariats;

• working groups;

• financial arrangements; and

• decision-making procedures.

Their constituent agreements define the organization's:

1. geographical area;

2. species or stocks covered;

3. participating states;

4. decision-making procedures;

5. scientific responsibilities;

6. conservation powers;

7. compliance mechanisms; and

8. financial structure.

This institutionalization distinguishes RFMOs from informal diplomatic cooperation.

An RFMO commission can adopt conservation measures that subsequently become binding upon its contracting parties according to the relevant constitutive instrument.

In this sense, RFMOs represent a form of delegated international regulatory authority.

States do not surrender sovereignty over the high seas. Rather, they agree to exercise their rights collectively through an institution.

3. The Principle of Cooperation

The principle of cooperation constitutes the foundation of international fisheries governance.

Under UNCLOS, states cannot treat high-seas fisheries as a purely unilateral matter when the biological characteristics of a stock connect multiple jurisdictions.

Fish do not respect maritime boundaries.

A stock may:

• spawn in one EEZ;

• migrate through another;

• enter the high seas;

• return to coastal waters; and

• cross several RFMO jurisdictions.

Consequently, unilateral conservation measures may be ineffective or even counterproductive.

The legal response has been the development of cooperative fisheries management.

RFMOs institutionalize this cooperation.

Rather than requiring states to negotiate separately each time a stock moves across jurisdictional boundaries, an RFMO provides a continuing forum through which states can:

• exchange scientific information;

• establish catch limits;

• determine fishing seasons;

• regulate gear;

• allocate fishing opportunities;

• establish monitoring requirements; and

• adopt conservation measures.

The RFMO therefore transforms the general duty to cooperate into an institutionalized process.

4. The 1995 UN Fish Stocks Agreement

The UN Fish Stocks Agreement represents the most important development in the international legal framework governing straddling and highly migratory fish stocks after UNCLOS.

Its principal objective is to ensure the long-term conservation and sustainable use of these stocks through effective implementation of UNCLOS.

The Agreement significantly strengthened the legal position of RFMOs.

States fishing for straddling or highly migratory stocks are required to cooperate, directly or through appropriate RFMOs or arrangements.

This means that an RFMO is not simply a convenient administrative body.

For covered stocks, it is an important mechanism through which states fulfill their international obligations.

The Agreement also establishes principles that must guide RFMO decision-making, including:

• application of the precautionary approach;

• reliance on best scientific information;

• consideration of ecosystem interactions;

• protection of marine ecosystems;

• minimization of pollution;

• reduction of waste and bycatch; and

• protection of biodiversity.

5. The Precautionary Approach

One of the most significant contributions of the UN Fish Stocks Agreement is the incorporation of the precautionary approach into international fisheries law.

Traditional fisheries management often operated according to a logic of exploitation followed by scientific assessment.

The precautionary approach reverses this presumption.

Where scientific information is uncertain, the absence of complete scientific certainty cannot automatically justify delaying conservation measures.

This principle is particularly important for fisheries because marine ecosystems are complex and scientific knowledge is frequently incomplete.

A fish stock may decline significantly before scientists possess sufficient data to determine the precise cause.

The precautionary approach therefore encourages managers to act before irreversible or serious harm occurs.

For RFMOs, this means that scientific uncertainty can become a reason for more cautious management rather than an excuse for postponing regulation.

6. Ecosystem-Based Fisheries Management

The evolution of RFMO law has also involved a shift from species-specific management toward an ecosystem perspective.

Traditional fisheries regulation focused primarily on the target stock.

For example, an organization might determine the permissible catch of a particular tuna species.

However, harvesting that species can affect:

• sharks;

• seabirds;

• turtles;

• marine mammals;

• non-target fish;

• food-web relationships; and

• seabed ecosystems.

The ecosystem approach recognizes that a fishery cannot be understood independently of the ecological system in which it operates.

RFMOs increasingly address:

• bycatch;

• vulnerable marine ecosystems;

• seabird mortality;

• shark conservation;

• habitat destruction;

• abandoned fishing gear; and

• ecosystem impacts.

This has expanded the traditional conception of fisheries law into a broader form of marine environmental governance.

7. The Geographic Scope of RFMO Authority

RFMOs are inherently regional.

Their geographical scope may encompass:

• specific ocean basins;

• migratory corridors;

• high-seas areas;

• adjacent EEZs;

• particular ecological regions; or

• areas defined according to the distribution of target stocks.

The geographical definition of an RFMO is legally important because competence generally depends upon the organization's constitutive treaty.

For example, an RFMO established to regulate tuna in a particular ocean basin cannot automatically claim jurisdiction over every species or every environmental activity within that region.

This produces a potentially fragmented governance structure.

Several organizations may operate in the same ocean region but possess different mandates.

One may regulate tuna.

Another may regulate deep-sea species.

Another may regulate highly migratory species.

Another may focus on marine mammals.

Such overlapping mandates can create regulatory gaps or inconsistencies.

8. Species-Specific Versus Ecosystem Mandates

A central doctrinal question is whether RFMOs possess authority to regulate species that are not explicitly identified in their constitutive instruments.

A narrow interpretation maintains that an RFMO is a treaty-based organization and therefore cannot exercise powers beyond the competence granted by its founding agreement.

A broader interpretation emphasizes the development of ecosystem-based fisheries management.

Under this approach, regulating a target species may necessarily require regulation of associated species and environmental interactions.

For example, if fishing methods used to harvest a commercially important stock produce significant mortality of endangered sharks or seabirds, an RFMO may need to regulate those impacts to fulfill its conservation mandate.

The legal question therefore becomes whether ecosystem-based management is:

an interpretive extension of the existing mandate or a substantive expansion of institutional competence.

The answer depends largely on the wording of the constitutive treaty and subsequent state practice.

9. Decision-Making within RFMOs

Decision-making procedures vary among RFMOs.

Common mechanisms include:

• consensus;

• majority voting;

• qualified majority;

• objection procedures; and

• combinations of these mechanisms.

Consensus has traditionally been favored because fisheries management directly affects national economic interests.

However, consensus can create difficulties.

A single state may sometimes prevent agreement on ambitious conservation measures.

For this reason, some RFMOs have developed decision-making systems in which a measure becomes binding unless a contracting party formally objects within a specified period.

This objection procedure can accelerate decision-making while preserving a degree of state control.

Nevertheless, objection mechanisms may themselves create legal disputes concerning:

• grounds for objection;

• validity of objections;

• compatibility with the RFMO treaty;

• consequences for the objecting state; and

• whether objections may undermine collective conservation objectives.

10. Allocation of Fishing Opportunities

One of the most politically sensitive functions of RFMOs is allocation.

Where a fish stock is subject to a total allowable catch, states must determine how fishing opportunities are distributed.

Allocation systems may consider:

• historical catch;

• dependence on the fishery;

• coastal-state interests;

• contributions to scientific research;

• conservation performance;

• economic dependence;

• traditional fishing practices; and

• the interests of developing States.

This creates a fundamental tension.

A conservation rule may be scientifically straightforward:

the total catch must be reduced.

The politically difficult question is:

whose catch should be reduced?

Allocation disputes have therefore become an important part of RFMO practice.

They also demonstrate that fisheries law involves not merely environmental science but questions of equity, economics, development, and state interests.

11. Non-Members and the Problem of Free Riders

One of the greatest structural challenges confronting RFMOs is the behavior of non-members.

A state may choose not to join an RFMO while its vessels fish within the organization's geographical area.

This creates a classic free-rider problem.

Members may accept restrictions in order to conserve a stock while non-members continue fishing.

The result can undermine the effectiveness of the entire management system.

The UN Fish Stocks Agreement addresses this problem by establishing obligations concerning cooperation and non-members.

States fishing for relevant stocks on the high seas are expected to cooperate directly or through appropriate RFMOs.

Furthermore, where an RFMO adopts conservation and management measures, states whose vessels fish in the relevant area are expected to cooperate with the organization.

The legal difficulty arises because an RFMO cannot simply impose treaty obligations upon a state that has never consented to the constitutive instrument.

This is a classic issue of pacta tertiis.

12. Pacta Tertiis and Non-Party States

The principle reflected in Article 34 of the Vienna Convention on the Law of Treaties provides that a treaty does not create obligations or rights for a third state without its consent.

RFMOs therefore face a structural legal limitation.

They cannot simply declare that a conservation measure is binding upon every state in the world.

The solution has increasingly been to frame RFMO measures within the broader obligations of international fisheries law.

A non-member state may not be bound by the RFMO treaty as a treaty, but it may still have obligations under:

• UNCLOS;

• the UN Fish Stocks Agreement;

• customary international law;

• other applicable fisheries agreements; or

• duties of cooperation and conservation.

This distinction is crucial.

The RFMO cannot necessarily create obligations for outsiders through institutional fiat.

However, the broader international legal framework may require those outsiders to cooperate with conservation regimes.

13. Cooperating Non-Contracting Parties

Many RFMOs have therefore developed the category of Cooperating Non-Contracting Party.

This mechanism attempts to reconcile two competing objectives:

1. preventing non-members from undermining conservation measures; and

2. respecting the principle that treaties do not bind third states without consent.

A cooperating non-member may receive access to fishing opportunities or other privileges in exchange for accepting relevant conservation and reporting requirements.

This creates a pragmatic bridge between formal membership and complete non-participation.

Nevertheless, the legal status of cooperating non-members varies among organizations and should not be assumed to be identical across all RFMOs.

14. Compliance and Monitoring

Modern RFMOs increasingly depend upon sophisticated compliance systems.

These may include:

• vessel monitoring systems (VMS);

• electronic monitoring;

• observer programs;

• catch documentation schemes;

• transshipment reporting;

• vessel registers;

• port inspections;

• satellite tracking;

• inspection at sea;

• landing declarations; and

• electronic logbooks.

These mechanisms have transformed fisheries regulation.

International fisheries law is no longer based solely on treaty texts and diplomatic reporting.

It increasingly operates through real-time data and technological surveillance.

The resulting information can be used to determine whether vessels:

• exceeded catch limits;

• entered closed areas;

• used prohibited gear;

• failed to report catches;

• engaged in illegal transshipment;

• targeted prohibited species; or

• violated conservation measures.

15. Flag-State Responsibility

The flag State remains a central actor in international fisheries law.

Under the law of the sea, vessels generally operate under the jurisdiction of their flag State on the high seas.

Consequently, effective fisheries governance requires flag States to exercise meaningful control over their fishing vessels.

This includes:

• licensing;

• registration;

• monitoring;

• reporting;

• investigation of violations; and

• appropriate enforcement action.

The international legal problem arises where flag States fail to exercise effective control.

This can allow vessels to operate under flags associated with weak enforcement.

The phenomenon of flags of convenience therefore presents a serious challenge to fisheries governance.

16. Port-State Measures

Port-State jurisdiction has emerged as an important complement to flag-State control.

The basic concept is straightforward:

A vessel may operate beyond national jurisdiction, but eventually it usually needs to enter a port to:

• land fish;

• refuel;

• repair;

• resupply; or

• transfer cargo.

Port States can therefore inspect vessels and documents and deny port access or services where illegal fishing is suspected.

The FAO Agreement on Port State Measures to Prevent, Deter and Eliminate Illegal, Unreported and Unregulated Fishing, adopted in 2009, represents a major development in this field.

Port-State measures are particularly significant because they shift part of enforcement from the difficult environment of the high seas to a location where states exercise territorial jurisdiction.

17. Illegal, Unreported and Unregulated Fishing

RFMOs play a central role in combating IUU fishing.

Illegal fishing includes fishing conducted in violation of applicable conservation rules.

Unreported fishing involves catches that are not reported or are misreported.

Unregulated fishing can include fishing activities outside the effective regulatory framework of an RFMO or applicable conservation system.

IUU fishing can undermine:

• stock assessments;

• allocation systems;

• conservation measures;

• food security;

• legitimate fishing industries; and

• the credibility of international fisheries law.

RFMOs have responded through measures including:

• IUU vessel lists;

• catch documentation;

• port inspections;

• trade restrictions;

• vessel identification requirements;

• transshipment controls; and

• sanctions against vessels involved in prohibited activities.

18. Blacklists and Due Process

The use of IUU vessel lists raises an important legal issue.

When an RFMO places a vessel on an IUU list, that designation may have significant economic consequences.

A listed vessel may face:

• denial of port access;

• prohibition of landing;

• denial of fishing authorization;

• trade restrictions; or

• reputational consequences.

This creates a need for procedural safeguards.

A robust RFMO compliance system should therefore provide:

• notice;

• evidence;

• opportunity to respond;

• review;

• appeal or objection mechanisms; and

• clear criteria for delisting.

This demonstrates that international fisheries governance increasingly intersects with principles of international administrative law and procedural fairness.

19. Scientific Committees and the Role of Expertise

Science is central to RFMO decision-making.

Most RFMOs maintain scientific committees or equivalent expert bodies.

These bodies may assess:

• stock size;

• recruitment;

• fishing mortality;

• maximum sustainable yield;

• ecosystem interactions;

• bycatch;

• climate impacts;

• habitat conditions; and

• uncertainty.

The scientific process is intended to create an objective basis for conservation decisions.

Yet science does not eliminate politics.

Scientific bodies may recommend a particular catch limit, while the political commission ultimately adopts a different measure.

This creates an important distinction between:

scientific advice and legal decision-making.

The science informs the decision, but the final decision generally remains an act of the organization's competent political body.

20. The Best Scientific Evidence Available

International fisheries law increasingly requires decisions to be based upon the best scientific information available.

This standard is important because it prevents states from disregarding established scientific evidence merely because the information is inconvenient.

At the same time, "best available science" does not necessarily mean perfect science.

Marine ecosystems are inherently uncertain.

Therefore, the appropriate legal standard must accommodate uncertainty while preventing deliberate inaction.

This is precisely where the precautionary approach and scientific advice intersect.

21. Climate Change and RFMO Governance

Climate change is increasingly challenging traditional assumptions underlying fisheries management.

Ocean warming is changing:

• fish distribution;

• migration patterns;

• spawning grounds;

• productivity;

• food webs; and

• stock composition.

A species historically associated with one RFMO region may increasingly move into another.

This creates institutional difficulties because RFMO boundaries are legally fixed while biological systems are dynamic.

Climate change therefore exposes a fundamental tension:

ecological boundaries do not necessarily correspond to legal boundaries.

RFMOs will consequently need greater coordination and adaptive management.

22. Marine Biodiversity Beyond Target Fish Stocks

Modern fisheries law increasingly recognizes that fisheries affect broader marine biodiversity.

Fishing activities can damage:

• corals;

• sponges;

• benthic ecosystems;

• seabirds;

• turtles;

• marine mammals;

• sharks; and

• other non-target organisms.

The legal evolution of RFMOs therefore increasingly overlaps with international environmental law.

This is especially evident in measures concerning vulnerable marine ecosystems (VMEs).

Bottom fishing, for example, may affect fragile deep-sea habitats that recover extremely slowly.

RFMOs have consequently developed measures involving:

• area closures;

• encounter protocols;

• gear restrictions;

• scientific assessments; and

• reporting requirements.

23. RFMOs and the BBNJ Agreement

The adoption of the BBNJ Agreement creates an important new dimension in the legal environment within which RFMOs operate.

The BBNJ Agreement addresses:

1. marine genetic resources;

2. area-based management tools, including marine protected areas;

3. environmental impact assessments; and

4. capacity building and transfer of marine technology.

RFMOs are therefore part of the broader network of regional and sectoral organizations operating in ABNJ.

The BBNJ Agreement does not simply replace existing fisheries organizations.

Instead, it establishes principles and mechanisms intended to coexist with existing relevant legal instruments and bodies.

This raises important questions regarding:

• institutional cooperation;

• conservation measures;

• marine protected areas;

• environmental impact assessment;

• data sharing; and

• compatibility between fisheries decisions and broader biodiversity objectives.

24. Marine Protected Areas and RFMOs

One of the most important future areas of interaction concerns marine protected areas (MPAs).

A BBNJ MPA may overlap with an area regulated by an RFMO.

This creates a difficult institutional question:

Who has authority to regulate fishing within the protected area?

The answer depends upon the applicable legal instruments and the institutional competence of the relevant organizations.

The BBNJ Agreement seeks to promote coordination rather than automatically displace existing sectoral bodies.

Consequently, the effectiveness of marine conservation may depend upon cooperation between:

• the BBNJ Conference of the Parties;

• RFMOs;

• regional seas organizations;

• IMO;

• ISA;

• coastal States; and

• other competent organizations.

This represents a movement toward polycentric ocean governance.

25. Fragmentation of International Fisheries Law

The RFMO system has produced significant benefits, but it also creates fragmentation.

Different organizations may adopt different rules concerning:

• catch documentation;

• observer requirements;

• vessel monitoring;

• transshipment;

• bycatch;

• IUU lists;

• sanctions;

• scientific standards; and

• compliance procedures.

A fishing vessel operating across several RFMO areas may therefore face multiple regulatory regimes.

This can increase administrative costs and create loopholes.

For example, a vessel prohibited from fishing under one RFMO may attempt to move into another regulatory area.

The answer is not necessarily to eliminate regional organizations.

Rather, greater inter-RFMO harmonization may be necessary.

26. The Global Record and Vessel Identification

Effective fisheries governance increasingly depends upon reliable vessel identification.

A fishing vessel may change:

• name;

• flag;

• ownership;

• registration;

• call sign; or

• physical appearance.

Without persistent identification, enforcement becomes difficult.

International systems such as the FAO Global Record seek to improve transparency concerning fishing vessels.

RFMOs also maintain authorized-vessel lists and other databases.

The long-term objective should be interoperability among these systems.

27. Transshipment at Sea

Transshipment is another significant regulatory challenge.

A fishing vessel may transfer its catch to another vessel at sea rather than landing it in port.

This can facilitate legitimate logistical operations but may also complicate monitoring.

Potential risks include:

• concealment of illegal catch;

• misreporting;

• mixing of legally and illegally caught fish;

• laundering of catch;

• inadequate observer coverage.

RFMOs have therefore increasingly developed rules governing:

• authorization;

• advance notification;

• reporting;

• observer presence;

• vessel identification; and

• documentation.

Transshipment illustrates how fisheries enforcement requires regulation of the entire supply chain rather than merely the act of catching fish.

28. Trade Measures

Some RFMOs employ trade-related measures to reinforce conservation rules.

Where fish harvested in violation of conservation measures enters international markets, trade restrictions can reduce the economic incentives for non-compliance.

This raises legal questions concerning:

• compatibility with WTO rules;

• non-discrimination;

• proportionality;

• evidence;

• due process; and

• the relationship between environmental and trade law.

Trade measures are therefore powerful but legally sensitive tools.

Their legitimacy depends upon clear legal authority and appropriate procedural safeguards.

29. Developing States and Special Considerations

International fisheries law increasingly recognizes the special interests of developing States.

For many developing coastal States, fisheries are connected directly to:

• food security;

• employment;

• export revenue;

• rural livelihoods;

• cultural practices; and

• national economic development.

RFMO allocation decisions can therefore have consequences far beyond commercial fishing.

The UN Fish Stocks Agreement recognizes the special requirements of developing States, including the need for assistance in conservation, management, participation, and scientific capacity.

This reflects an important principle:

effective conservation cannot be separated entirely from equitable participation.

30. Small Island Developing States

Small island developing States have particularly significant interests in fisheries governance.

Their economies may depend heavily upon marine resources while their capacity to conduct large-scale fisheries research and enforcement remains limited.

RFMOs can provide:

• scientific expertise;

• shared monitoring;

• observer programs;

• technical assistance;

• access to fisheries data;

• capacity building; and

• collective decision-making.

However, equitable participation requires more than formal membership.

A state may possess a seat at an RFMO meeting while lacking the scientific and technical capacity to participate effectively.

Capacity building is therefore an essential component of institutional legitimacy.

31. Compliance Committees

Most contemporary RFMOs have some form of compliance mechanism.

Compliance committees may examine:

• national reports;

• observer information;

• vessel violations;

• catch discrepancies;

• illegal fishing allegations;

• implementation of conservation measures; and

• performance of contracting parties.

This institutionalization of compliance has transformed fisheries organizations from purely cooperative scientific bodies into more sophisticated regulatory institutions.

However, compliance mechanisms vary significantly in their powers.

Some organizations have relatively strong measures.

Others depend heavily upon political negotiation.

32. Sanctions and Collective Enforcement

RFMOs generally do not function like national criminal courts.

Their enforcement powers are usually indirect.

Possible measures may include:

• listing vessels;

• restricting fishing opportunities;

• denying access;

• requiring corrective action;

• restricting transshipment;

• trade measures;

• reducing allocations; or

• other measures established by the relevant treaty.

The effectiveness of sanctions depends heavily on implementation by member States.

This reflects a broader characteristic of international law:

international organizations frequently depend upon states to translate collective rules into concrete enforcement.

33. Dispute Settlement

Disputes involving fisheries may arise over:

• stock allocation;

• interpretation of conservation measures;

• RFMO competence;

• compliance;

• objections;

• scientific methodology;

• vessel enforcement; or

• overlapping jurisdiction.

The UN Fish Stocks Agreement contains detailed dispute-settlement provisions and reinforces the broader dispute-settlement framework of UNCLOS.

Potential forums include:

• the International Tribunal for the Law of the Sea;

• the International Court of Justice;

• arbitral tribunals; and

• other agreed mechanisms.

However, formal litigation is not always the preferred method.

Many fisheries disputes are resolved through:

• RFMO commissions;

• consultations;

• scientific committees;

• objection procedures; or

• diplomatic negotiation.

34. International Jurisprudence and Fisheries

Several international judicial and arbitral decisions have contributed to the development of the legal principles relevant to fisheries.

The Southern Bluefin Tuna Cases demonstrated the complexity of disputes involving highly migratory fish stocks and scientific uncertainty.

The South China Sea Arbitration addressed, among other issues, the conservation of living marine resources and the obligations of states concerning the marine environment.

The ITLOS Advisory Opinion on IUU Fishing concerning the Sub-Regional Fisheries Commission clarified important aspects of flag-State responsibility and due diligence.

These decisions collectively illustrate an important evolution:

States exercising high-seas fishing freedoms are not operating in a legal vacuum.

Their rights exist alongside obligations concerning:

• cooperation;

• conservation;

• environmental protection;

• due diligence; and

• respect for applicable international institutions.

35. The Due-Diligence Standard

Due diligence has become increasingly important in fisheries law.

A state may not necessarily be internationally responsible for every illegal act committed by a privately owned fishing vessel flying its flag.

However, the state may incur responsibility if it fails to take reasonable measures to:

• regulate vessels;

• monitor fishing;

• investigate violations;

• enforce applicable rules; and

• cooperate with international organizations.

The appropriate standard is therefore one of reasonable regulatory and enforcement diligence, rather than strict liability for every private act.

This distinction is particularly important for developing States that may lack extensive enforcement resources.

36. RFMOs as Laboratories of International Law

RFMOs are increasingly functioning as laboratories for the development of international regulatory techniques.

They have pioneered or expanded:

• electronic monitoring;

• catch documentation;

• vessel tracking;

• scientific observer programs;

• ecosystem-based management;

• precautionary management;

• IUU lists;

• port-state cooperation;

• transshipment regulation; and

• international fisheries data systems.

These mechanisms sometimes influence broader international environmental law.

Consequently, RFMOs should not be viewed merely as administrative organizations.

They contribute to the progressive development and implementation of international law.

37. The Legitimacy Problem

Despite their importance, RFMOs face questions of legitimacy.

Three dimensions are particularly important.

Procedural legitimacy

Are decision-making processes transparent and inclusive?

Scientific legitimacy

Are conservation decisions based upon credible and independent scientific evidence?

Substantive legitimacy

Do adopted measures fairly balance conservation with the interests of different states and communities?

These questions become increasingly important as RFMO decisions have consequences extending beyond the immediate members of the organization.

38. Transparency and Public Participation

Modern environmental governance increasingly emphasizes transparency.

RFMOs have responded by publishing:

• meeting documents;

• scientific reports;

• conservation measures;

• vessel lists;

• compliance reports; and

• catch data.

Nevertheless, transparency varies considerably.

Greater public accessibility can improve:

• accountability;

• scientific scrutiny;

• civil-society participation;

• compliance; and

• institutional legitimacy.

The development of digital platforms offers significant opportunities in this respect.

39. The Future of RFMOs in a Changing Ocean

The future role of RFMOs will be shaped by several developments.

Climate change

Changing fish distributions may require revised management boundaries.

Technological change

Automation, artificial intelligence, satellite surveillance, and advanced fishing technology will transform enforcement.

Genetic and biotechnology research

The growing value of marine genetic resources will increase interaction between fisheries law and the BBNJ regime.

Biodiversity conservation

MPAs and ecosystem-based management will increasingly overlap with traditional fisheries management.

Global seafood markets

International supply chains will make traceability increasingly important.

Illegal fishing

Sophisticated networks may require more integrated international enforcement.

RFMOs will therefore increasingly operate as components of a broader global ocean-governance system.

40. Toward Integrated Ocean Governance

The future of fisheries governance cannot depend upon RFMOs operating in isolation.

Effective ocean governance requires coordination among:

• RFMOs;

• UNCLOS institutions;

• BBNJ institutions;

• FAO;

• IMO;

• International Seabed Authority;

• regional seas organizations;

• coastal States;

• flag States;

• port States;

• scientific institutions; and

• market States.

The objective should not necessarily be institutional centralization.

Rather, it should be functional coordination.

Each institution can retain its legal competence while sharing information and coordinating measures affecting common ecosystems.

41. A New Model of Regionalism

RFMOs illustrate a broader transformation in international institutional law.

Traditional regionalism assumed that regional organizations could regulate regional problems independently.

Modern marine ecosystems demonstrate the limits of this approach.

Fish stocks, pollutants, climate systems, genetic resources, and marine ecosystems frequently cross regional boundaries.

The future model is therefore likely to be networked regionalism:

Global principles + regional institutions + national enforcement + scientific networks + digital monitoring

RFMOs are ideally positioned to function as regional nodes within such a system.

42. Critical Assessment of the RFMO System

The RFMO system possesses several structural strengths.

First, it recognizes the biological reality of migratory stocks.

Second, it allows specialized scientific management.

Third, it creates permanent institutional forums.

Fourth, it permits region-specific conservation measures.

Fifth, it can develop sophisticated compliance systems.

Yet important weaknesses remain.

These include:

• fragmented mandates;

• slow decision-making;

• allocation disputes;

• non-member participation;

• uneven enforcement;

• insufficient scientific capacity;

• overlapping jurisdictions;

• inadequate transparency in some institutions; and

• difficulty responding to rapidly changing ecosystems.

The challenge is therefore not whether RFMOs should continue to exist.

The more important question is how they should evolve within an increasingly integrated international ocean-governance system.

43. RFMOs and the Principle of Sustainable Use

The modern RFMO regime demonstrates that sustainable use has become a central principle of international fisheries law.

Sustainable use does not mean maximizing immediate harvest.

Rather, it requires balancing:

• present exploitation;

• long-term stock health;

• ecosystem integrity;

• economic interests;

• food security; and

• intergenerational equity.

This transforms fisheries management from a purely economic activity into a component of environmental governance.

44. From Freedom to Responsibility

The historical evolution of fisheries law can be represented as a progression:

Mare Liberum → Freedom of Fishing → Recognition of Resource Limits → UNCLOS Cooperation → UN Fish Stocks Agreement → Precautionary and Ecosystem-Based Management → Integrated Ocean Governance

This trajectory reflects a fundamental transformation in international law.

The high seas remain a space of freedom.

But freedom is no longer understood as unlimited exploitation.

It increasingly means freedom exercised within a framework of:

• cooperation;

• conservation;

• due diligence;

• scientific responsibility;

• environmental protection; and

• respect for the rights and interests of other states.

Conclusion

Regional Fisheries Management Organizations have become indispensable institutions in contemporary international fisheries law.

Their emergence reflects the transformation of the law of the sea from a system centered primarily on freedom toward a more complex legal order based upon cooperation, conservation, science, and shared responsibility.

UNCLOS established the foundational framework by recognizing both coastal-state rights and high-seas freedoms while imposing obligations concerning conservation and cooperation. The 1995 UN Fish Stocks Agreement subsequently strengthened this architecture by introducing more detailed rules concerning straddling and highly migratory fish stocks, the precautionary approach, ecosystem considerations, scientific management, compliance, and international cooperation.

RFMOs occupy the institutional center of this system.

They transform general international obligations into concrete measures concerning:

• catch limits;

• fishing seasons;

• gear;

• bycatch;

• vulnerable ecosystems;

• monitoring;

• vessel registration;

• transshipment;

• scientific research;

• compliance; and

• IUU fishing.

At the same time, their authority remains constrained by their constitutive treaties and by fundamental principles of international law, including state consent and the rule that treaties do not impose obligations upon third states without their consent.

The resulting system is therefore neither centralized nor purely voluntary.

It is a form of institutionalized international cooperation in which states retain sovereignty while accepting collective constraints necessary to conserve shared marine resources.

The emergence of climate change, digital monitoring, marine protected areas, and the BBNJ Agreement is now pushing this system into a new phase. RFMOs will increasingly need to coordinate with global and regional institutions dealing with biodiversity, environmental protection, marine technology, and ocean governance.

The central challenge is no longer simply preventing overfishing.

It is constructing a legal system capable of managing dynamic ecosystems through institutions whose jurisdiction remains geographically and legally fragmented.

The future legitimacy of RFMOs will therefore depend upon their ability to combine scientific integrity, procedural transparency, equitable participation, effective compliance, and institutional cooperation.

Ultimately, RFMOs demonstrate one of the most important developments in contemporary international law: the freedom of the high seas has not disappeared, but it has been progressively transformed from a freedom of unrestricted exploitation into a freedom conditioned by international responsibility.

In this transformation, RFMOs serve as the institutional bridge between the traditional principle of freedom of the seas and the modern imperative of sustainable and cooperative ocean governance.