NMFS issues a final rule implementing measures adopted by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) to facilitate conservation and management of AMLR. This final rule requires the use of the Centralized satellite-linked vessel monitoring system (VMS) by all U.S. vessels harvesting AMLR and makes use of VMS by the harvesting vessel a condition of import for all U.S. dealers seeking to import shipments of toothfish (Dissostichus) into the United States. This final rule also exempts all shipments of fresh toothfish from the NMFS preapproval process and allows importers of frozen toothfish to submit the U.S. Customs 7501 entry number subsequent to their initial application for preapproval. This final rule requires the use of Electronic Catch Documents for all U.S. dealers seeking to import shipments of toothfish into the United States. Paper-based catch documents for toothfish will no longer be accepted. This final rule also requires the use of a seal excluder device on krill vessels using trawl gear in the Area of the Convention for the Conservation of Antarctic Marine Living Resources (Convention Area). This final rule adds or amends definitions of "Antarctic marine living resources", "export", "import", "international observer", "land or landing", "mobile transceiver unit", "national observer", "Office for Law Enforcement (OLE)", "Port State", "re- export", "seal excluder device", "transship or transshipment", and "vessel monitoring system (VMS)". This final rule also expands the list of requirements and prohibitions regarding scientific observers and clarifies the duties and responsibilities of the observers on the vessels and of the vessel owners hosting the observers. This final rule identifies new information on all vessels licensed by CCAMLR Members to harvest AMLR in the area identified in the Convention on the Conservation of Antarctic Marine Living Resources (Convention). The intent of this rule is to incorporate new co