The United States, facing sanctions for discriminating against Mexican tuna imports, is instead expanding tougher rules for labeling tuna “dolphin-safe” on the rest of the world.

Last fall, the World Trade Organization ruled that the U.S. was unfairly using stricter tracking and verification standards on tuna fishing in the waters from San Diego to Peru, where Mexican fleets operate, than it was imposing elsewhere. In retaliation, Mexico has been preparing to slap $472 million in tariffs against high fructose corn syrup from the U.S.

The U.S. decided against loosening the rules on Mexico, choosing instead a plan that “elevates requirements for tuna product from every other region of the world,” U.S. Trade Rep. Michael Froman said in a statement.

The dolphin-safe labels are supposed to ensure that canned, dried and frozen tuna has been caught without endangering dolphins. Schools of tuna tend to gather and swim with some species of dolphins.

The new rules will require tuna boats worldwide to keep more paperwork and sometimes carry government observers.

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