NMFS hereby revises vessel identification requirements for fishing vessels with west coast highly migratory species (HMS) permits that are required under the Fishery Management Plan for U.S. West Coast Fisheries for Highly Migratory Species and for U.S. vessels fishing under the U.S.-Canada Albacore Treaty. The new measures allow these vessels to be marked in accordance with international standards that were implemented in early 2010 by NMFS for vessels fishing on the high seas in the area of application of the Convention on the Conservation and Management of Highly Migratory Fish Stocks in the Western and Central Pacific Ocean (Convention Area). Currently, the marking requirements for fishing vessels with west coast HMS permits or under the U.S.-Canada Albacore Treaty do not comport with these international standards. These new measures require vessels that fish in the Convention Area to display at all times their International Radio Call Sign (IRCS), or if an IRCS has not been assigned to the vessel, the vessel is required to display its official number, preceded by the characters "USA-." The intent of this action is to bring the existing vessel identification requirements for U.S. vessels with west coast HMS permits or under the U.S.-Canada Albacore Treaty into conformity with the binding vessel identification requirements adopted by the Western and Central Pacific Fisheries Commission (WCPFC).