The CetAMBICion project seeks to respond to the need to reduce cetacean bycatch in EU fisheries, in particular in the Bay of Biscay and on the Iberian Coast, one of the threats to the survival of these protected species. This objective is aligned with the objectives of the Marine Strategy Framework Directive, the Habitats Directive, and the Common Fisheries Policy. CetAMBICion will address mortality rates, abundance, demographic characteristics, pattern distribution and range and habitat of cetaceans with the aim of improving monitoring, especially in relation to bycatch mortality, and investigating the effectiveness of different mitigation measures in the Bay of Biscay and on the Iberian coast. This will ultimately contribute to achieving Good Environmental Status (GES).