The ‘Understanding Mediterranean multitaxa bycatch of vulnerable species and testing mitigation – a collaborative approach’ project ran from end 2017 to 2022 with the aim to improve the monitoring and mitigate the incidental capture of vulnerable species in fisheries (also known generically as bycatch), which represents a key conservation and sustainability issue in the Mediterranean for a number of taxonomic groups, namely sea turtles, marine mammals, seabirds, elasmobranchs and macrobenthic invertebrates. The project had a regional scope while implementing field activities in focus countries in the Mediterranean (Morocco, Tunisia, Türkiye, as well as Croatia and Italy from 2020).