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Decade of Data Shows Rapid Decline in Pelagic Fish, Invertebrates in Deep Gulf

Wire Brief
  • A decade-long study by the Southeast Fisheries Science Center found pelagic nekton in the deep Gulf of America declined 60 to 85 percent since 2010.
  • Pelagic nekton includes small fish, crustaceans, and cephalopods that form the base of the deep-sea food web.
  • The study tracked these populations in deep Gulf waters following the Deepwater Horizon oil spill.
  • NOAA Fisheries published the findings as a feature story on October 21, 2026.
  • No bag limits, regulatory changes, or management actions were announced alongside the study.
A long-term study found that pelagic nekton—small fish, crustaceans, and cephalopods—in the deep Gulf of America have declined by 60–85 percent since 2010.

Following the Deepwater Horizon oil spill, scientists across the region jumped into action to monitor its impacts. One particular effort focused on pelagic nekton—the small critters like fish, shrimp, and cephalopods that swim freely in the ocean and serve as the base of pelagic food webs. The Deep-Pelagic Nekton Dynamics of the Gulf (DEEPEND) Consortium led this project to quantify long-term trends in the offshore fauna of the Gulf. While observed declines in these critical prey groups can’t be tied directly to the spill, scientists have not identified another likely explanation. 

Continue reading at fisheries.noaa.gov.

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