US–Mexico Tuna-Dolphin WTO Labeling Dispute Explained

Introduction

International economics studies the flow of products across international boundaries. Countries develop policies for the smooth execution of trade and for establishing healthy international relations with one another. The United States of America is one of the world's most important economic markets, and its foreign trade encompasses both imports and exports. The United States Congress has been granted the authority by the Constitution to regulate international trade.

"The core of the problem of foreign economic policy is the need to balance domestic and international concerns. Particular decisions inevitably affect both. But policy makers do not always address these concerns in a balanced way." (Destler 1)

The dispute between the United States and Mexico over dolphin-safe tuna labeling began in the 1990s and has not yet been fully resolved.

Background of the Tuna-Dolphin Case

In the past, fishermen used school fishing and log fishing to catch tuna. In school fishing, tuna were caught from freely swimming schools of fish, while in log fishing, tuna that had gathered beneath floating objects such as a log were harvested. These older methods yielded insufficient output.

In the eastern Pacific Ocean, schools of tuna swim beneath schools of dolphins. Fishermen had long known that certain dolphin species were accompanied by schools of tuna. This led to the development of the purse seine technique, which allowed fishermen to exploit the association between dolphins and tuna. Purse seine fishing is used to catch fish near the surface, such as sardines and tuna. A large net is set around both the tuna and the dolphins; after they are gathered, the dolphins are released and the tuna are kept. However, dolphins frequently become entangled in the net and die. In the early years of this fishery, enormous numbers of dolphins perished due to commercial fishing pressures. Fishermen would observe dolphin behavior to locate tuna, but this practice repeatedly led to dolphins being caught in the nets and killed, unless they could be released — a process that often required releasing much of the tuna as well.

Dolphin mortality became an unavoidable by-product of tuna fishing. At first, fishermen were pleased to have found an effective technique for locating tuna, the result of which was the death of several million dolphins since 1959 (Joseph, 1994). Over time, fishermen began to recognize that their method depended on the continued existence of dolphins and would be rendered useless if dolphins became extinct. They therefore began devising methods to reduce dolphin mortality while still catching tuna.

The U.S. Congress passed the Marine Mammal Protection Act of 1972 (MMPA) to establish a framework for protecting marine mammals from human activities, except where proper authorization had been granted. The Act has been amended over the years with the goal of maintaining an optimum population level of marine mammals and preventing them from becoming endangered. The MMPA sets dolphin protection standards for both American fishermen and foreign vessels fishing in the eastern Pacific Ocean. It established a limit on the number of dolphins that could be incidentally taken during tuna fishing, and it created the Direct Embargo Provision, which prohibited the importation of tuna from countries that purchased tuna from nations whose fishing standards did not comply with the MMPA.

Congress introduced several specific measures within the MMPA framework:

1. Intermediary Nation Provision: Countries that did not catch tuna themselves but were involved in exporting tuna to the United States had to certify that they had not purchased that tuna from countries whose fishing practices did not meet U.S. standards.

2. Pelly Amendment: Congress granted the President of the United States the authority to impose an embargo on fish imports for a period determined at the President's discretion.

3. Dolphin Protection Consumer Information Act: The "dolphin-safe" label could only be applied to tuna caught using dolphin-safe techniques.

Mexico was the principal exporting country affected. The United States banned Mexican tuna exports in 1991 on the grounds that large numbers of dolphins were being killed in the tuna harvesting process. The United States also imposed embargoes on imports from Venezuela, Panama, and Vanuatu for failing to comply with U.S. standards.

In response to the embargo, Mexico filed a complaint through GATT. The United States based its defense on Article XX of GATT, which allows trade restrictions deemed necessary to protect human, animal, or plant life or health, or relating to the conservation of exhaustible natural resources. GATT did not accept this argument. It concluded that the United States could not impose its domestic laws on the trade practices of another country — it could object to the quality of the tuna product itself, but not to the fishing technique used to produce it. GATT rules did not permit one country to take measures enforcing its domestic laws in another country, even in the name of protecting animals, the environment, or natural resources. The rationale was that accepting the U.S. argument would open the door for any country to ban another's exports and attempt to impose its own domestic laws abroad. Every nation has its own environmental, health, social, and economic laws, and foreign countries have no right to interfere with those laws.

"Environmentalists in the United States and Europe have been trying to promote conservation elsewhere by putting their concerns into trade laws and negotiations." (Bradsher)

Along with Mexico, six other countries protested to GATT about the U.S. embargo, arguing that the United States was attempting to exercise extraterritorial power. In 1991, Mexico's minister for Press and Public Affairs at its Washington embassy stated that Mexico had reduced its dolphin mortality by 70% over the preceding five years. Mexico declared the U.S. embargo GATT-illegal, noting that GATT prohibits countries from instructing other nations on how to produce goods destined for export. Despite these rulings, they were never formally adopted, and the two countries ultimately settled the case outside the formal dispute resolution process.

The Tuna-Dolphin Case I of 1991 concerned the primary embargo on Mexican tuna exports. The first GATT Panel ruled against the United States on the grounds that it was attempting to protect resources lying outside its own jurisdiction. The Tuna-Dolphin Case II of 1994 addressed the intermediary nation embargo — that is, the ban on tuna from countries that purchased from nations not using dolphin-safe methods. The second panel rejected U.S. arguments on the grounds that a country could only impose trade restrictions based on dissatisfaction with a product itself, not with the process by which it was produced. A country's internal regulations cannot be applied extraterritorially.

Analysis of the Tuna-Dolphin Case

Decades after the initial dispute, the struggle between the two countries continues. The United States still refuses to allow Mexican dolphin-safe labeled tuna on its store shelves, even though every can of tuna imported from Mexico carries a certification that no dolphins were harmed or killed during harvesting. The World Trade Organization (WTO) sided with Mexico, yet this ruling has had little practical effect on U.S. policy. The ban on Mexican tuna imports has significantly hurt the livelihoods of Mexican fishermen. One fisherman, Gutiérrez, noted that while approximately 100,000 dolphins died annually in the past, fishermen have since adopted methods allowing dolphins to escape the nets (Kahn).

In earlier decades, commercial interests drove the exploitation of natural resources with little regard for consequences. Today, having witnessed the environmental costs of unchecked development, communities worldwide are far more concerned about ecological balance. The international community has grown increasingly aware of the impacts of human activity on the natural environment and now widely recognizes environmental protection as a global concern. Governments have accordingly made the enactment and enforcement of environmental laws a priority. The U.S. Marine Mammal Protection Act is one such example, as are laws governing pollution and toxic waste management in countries such as China. Environmental governance has thus expanded well beyond traditional affairs of state.

At the same time, nations seek to protect and grow their economies, and modern economies are deeply dependent on trade. Natural resources are not evenly distributed across the globe: some countries are rich in natural resources, others in human capital, and others in financial resources. Pakistan, for example, possesses abundant natural resources but lacks the entrepreneurial capacity and capital to exploit them fully. The Middle East holds significant financial resources but is limited in fertile land and freshwater. It is trade and the exchange of resources that allows economies to operate at their optimal level.

Trade promotes employment, increases production efficiency, and expands consumer choice. However, it also brings negative consequences: increased manufacturing has polluted waterways, rising vehicle use has depleted fossil fuels and degraded air quality, and expanding furniture production has contributed to deforestation. No single concern can be addressed in isolation. A balance must be sought.

"The question, therefore, is not whether trade or environment prevails. The question is, how can our societies effectively achieve both environmental and trade goals? Part of the answer is that measures for environmental protection that affect trade must be designed in light of trade concerns. Equally important, measures for liberalizing trade that affect environment or environmental policy must be designed and implemented consistent with environmental goals." (Downes and Van Dyke)

The global fish market has expanded enormously. From the late 1950s to the 1980s, total fishery harvests multiplied fivefold, and fishery products now constitute one of the most valuable exports for developing countries (Stone 519–520). Unlike poultry, fish cannot be produced artificially to meet rising demand. Some marine fisheries have already collapsed. Overfishing disrupts ecosystems — large fish lose their food sources and face extinction. Pollution and coastal development compound these threats. Government subsidies to the fishing industry have accelerated this overexploitation by expanding storage capacity and providing modern equipment, enabling fishermen to harvest beyond sustainable levels. If natural resources are not managed wisely, future generations will inherit a depleted planet.

Eco-labeling — the placement of environmental information on product packaging — serves as a form of communication between environmentally conscious producers and consumers. However, the WTO has little expertise in fisheries conservation and almost no institutional commitment to it (Downes and Van Dyke). This means that resource conservation issues must be addressed through dialogue with environmental experts, not simply through trade law. Moreover, labeling tuna cans does not by itself prevent dolphin deaths. Ultimately, the consumer is the market's decisive actor, and not all consumers are willing to pay a premium for dolphin-safe tuna (Mitchell). As long as demand for cheaper tuna exists, it will be supplied regardless of labeling requirements.

In response to the MMPA and international efforts to protect dolphins, many fishermen shifted their operations to the western Pacific, where dolphins and tuna do not swim together and purse seine fishing is therefore less of a concern. However, contrary to popular belief, purse seine fishing is not the only threat to dolphins. Mexico argues that its purse seine method is far safer for dolphins than alternatives such as Fish Aggregating Devices (FADs) (Disputes Roundup). FADs are commonly used outside the eastern Pacific and produce significantly higher levels of by-catch, yet the dolphin-safe label does not account for this difference — meaning it does not accurately represent the actual risk to dolphins posed by various fishing methods.

The Agreement on the International Dolphin Conservation Program (AIDCP), which entered into force in February 1999, set out three primary objectives:

1. To reduce dolphin mortality in the purse seine fishery.

2. To seek means of capturing tuna without causing harm to dolphins.

3. To ensure the sustainability of tuna stocks and other marine resources associated with this fishery.

Mexico invested heavily in its tuna fleet to comply with AIDCP standards. Since 1990, dolphin mortality in Mexican tuna fisheries has decreased by 99%. The bilateral tuna trade is worth billions of dollars and is critically important to Mexico's developing economy. Mexico also exports tuna to Italy, Japan, and France. Under the MMPA, the United States is required to ban not only direct Mexican tuna imports but also tuna from any country that purchases from Mexico. This puts Mexico's entire export market at risk. Mexico maintains that U.S. labeling laws constitute an illegal import barrier. In 2012, the WTO ruled that U.S. measures were unfair because they addressed only the dolphin risks associated with purse seine fishing while ignoring equivalent risks posed by alternative methods. Mexico is the United States' third largest trading partner, and the United States is Mexico's largest. Additionally, the United States is the largest source of Foreign Direct Investment (FDI) in Mexico.

Conclusion

The tuna-dolphin dispute illustrates the inherent tension between a nation's right to enforce environmental standards and the principles of free and fair international trade. Decades of litigation have produced rulings but not resolution. Both GATT panels found against the United States, and the WTO ruled in Mexico's favor in 2012, yet the practical situation on the ground has changed little. What is clear is that neither unilateral trade embargoes nor narrow labeling regimes adequately address the complex realities of global fisheries. A sustainable path forward requires genuine bilateral cooperation, the elimination of perverse subsidies, and the development of shared conservation frameworks grounded in science rather than domestic politics. Only through such collaborative approaches can the two countries protect both their economic interests and the marine ecosystems on which those interests ultimately depend.