Assertion: bluefin tuna's stock | /r/CapableOf | spawn in the gulf of mexico
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text: The Fisheries Service is relying on international management, which has failed for the past 40 years, to save the species — despite the fact that the United States is primarily responsible for the decline of the western Atlantic bluefin tuna, a critically endangered stock that spawns in the Gulf of Mexico and is fished mostly by U.S. fishermen.