This legislation aims to significantly strengthen efforts to combat illegal, unreported, and unregulated (IUU) fishing globally, including its connections to forced labor and other maritime security threats. It mandates the creation and public maintenance of an IUU vessel list by the Secretary of Commerce, in coordination with other agencies, identifying foreign vessels, fleets, and their beneficial owners engaged in IUU fishing or supporting activities. Vessels can be included on this list if they are already on an international fishery management organization's list, undermine conservation measures, are identified by U.S. authorities for IUU fishing without foreign country action, or provide services to listed vessels. The bill outlines procedures for nominations, notification to beneficial owners, review of evidence, and potential removal, while requiring annual publication of the list and its procedures. Furthermore, the Act imposes visa sanctions on foreign persons identified as beneficial owners of vessels on the IUU list, making them inadmissible to the United States and revoking any existing visas. Exceptions are provided for national interest waivers, authorized intelligence activities, international agreement compliance, and provisions for vessel and crew safety. The legislation encourages the President to consider IUU fishing and forced labor impacts in international agreements and urges the Federal Government to promote ratification of relevant treaties and pursue bilateral and multilateral initiatives. It also directs the Coast Guard to increase observation and boarding of suspected IUU fishing vessels on the high seas and coordinate with regional fisheries management organizations on corrective measures taken by countries. To enhance management, the Interagency Working Group on IUU Fishing is tasked with developing strategies to leverage enforcement capacity against IUU fishing and associated abuses like forced labor. The bill also requires strategies to optimize data collection, sharing, and analysis to prevent IUU seafood from negatively affecting U.S. commerce, including recommendations for joint enforcement protocols and risk-targeting. It encourages increased support for programs providing technical assistance and investment to nations' fisheries sectors for sustainable management and combating IUU fishing. A strategy must be developed to identify seafood harvested on foreign vessels using forced labor, with information published on a public website. The Act mandates several studies, including one on the impact of new technologies on IUU fishing and associated crimes, and another on the influence of Russian and Chinese fishing industries. A comprehensive study by the National Academies will quantify the extent and costs of IUU fishing and forced labor, and assess the effectiveness of response strategies. Importantly, the Act explicitly states that its authorities do not include imposing sanctions on the importation of goods.