The International Seafood Sustainability Foundation (ISSF) has released its 2024 update on the large-scale tropical tuna purse seine fishing fleets, revealing a minor decrease in the number of vessels and a slight increase in fishing capacity. The report highlights the importance of accurate estimates of active vessels for regional and global management of tuna fishing. It calls for tuna RFMOs to maintain lists of authorized vessels operating in entire Convention Areas and to improve the quality of data in RFMO records. The updated report can be accessed online.