On August 28, 2018, the National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), Commerce published in the Federal Register a notification advising that the Secretary of Commerce, in cooperation with the Secretaries of Treasury and Homeland Security, is, under the authority of the Marine Mammal Protection Act (MMPA), giving notice of import restrictions on fish and fish products from Mexico caught with gillnets deployed in the range of the vaquita, an endangered porpoise. Importation into the United States from Mexico of fish and fish products harvested by gillnets in the upper Gulf of California (UGC) within the vaquita’s geographic range is now prohibited. These import restrictions are being implemented as required by a court order. These trade restrictions remain in effect until further court action amends the preliminary injunction. Harmonized Tariff Schedule (HTS) codes associated with the prohibited fish and fish products are identified in the notification (and in CSMS #18-000484 issued by CBP on August 15). NMFS is also requiring that all other fish and fish products not within the scope of the import restrictions but imported under the same published HTS codes be accompanied by a Certification of Admissibility. Compliance with the import restrictions and Certification of Admissibility described in this document is required beginning August 24, 2018, and will remain in effect until further notice is published in the Federal Register indicating otherwise.