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- A investigação realizada no IPMA de suporte ao aconselhamento científico para a gestão de espécies de raiasPublication . Serra-Pereira, Bárbara; Maia, Catarina; Lagarto, Neide; Figueiredo, Ivone; Instituto Português do Mar e da AtmosferaIPMA is responsible for the study and scientific advice on the state of exploitation of some skate species with commercial interest. About 80% of skate and ray species’ landings are by-catch from the Portuguese polyvalent fleet, consisting of vessels holding licenses for various fishing gears (e.g. trammel nets, gillnets, longlines) and operating on the Portuguese continental shelf. The five species with more commercial interest are: thornback ray, Raja clavate; blonde ray, R. brachyura; spotted ray, R. montagui; cuckoo ray, Leucoraja naevus; and undulate ray, R. undulata. The Common Fisheries Policy of the European Union is responsible for the management of each skate stock. The management tool used is the establishment of Total Allowable Catch (TACs). In Portugal, additional technical management measures (e.g. seasonal closure, minimum catch size) were also legislated. The quality of scientific advice on exploitation state of the different stocks of skates, which for ICES Division 27.9a (including Portugal and Spain) is done every two years since 2014, is strongly dependent on the quality of available information, particularly on the biology and dynamics of these species and on their fisheries. The economic and social importance of these fisheries for fishing communities makes the research carried out at IPMA fundamental to increase the knowledge on skate and ray species and provide scientific advice for the management of the different stocks occurring in mainland Portugal. This report gives an overview of the research studies carried out at IPMA/IPIMAR since 2003.