As part of the European Commission's "Data Collection Framework", the MEDITS campaign is the Mediterranean component of the Sea surveys project. The geographical coverage of the program includes all trawl facades from 12 countries contributing to this campaign in the Mediterranean (Spain, Italy, France, Greece, Cyprus, Malta, Slovenia, Croatia, Montenegro and Albania) and since 2009 in the Black Sea (Romania and Bulgaria). For the French part, the trawl areas are East Corsica and the Gulf of Lion. The sampling strategy is common to all countries and immutable since the beginning of the program (1994). The standardization of the observation methods allows the reproduction of bottom trawling under similar conditions and thus the comparison of abundance indices of different species between different areas from year to year. These protocols focus mainly on the campaign period, the location of the sampling stations, the characteristics and methods of use of the capture gear, the biological observations (weighing, counting, measurements, maturity analysis, sampling of otoliths ...), computer file formats. They have been defined in common and are applied by all teams participating in the program. States must therefore ensure the collection of data and the management of these direct assessment campaigns. The data from each cruise is used to provide several indicators required by fisheries managers for international expertise (GFCM (General Fisheries Commission for the Mediterranean) and STECF (Scientific, Technical and Economic Committee for Fisheries)) and national stock assessments (responses to MFAD (Maritime Fisheries and Aquaculture Directorate) referrals, communications to the profession, ...) but also for the Ecosystem Approach to Fisheries, MSFD (Marine Strategy Framework Directive) (hydrology, gelatinous, marine litters, trophic chain, ...) and for research purposes (GALION projects currently underway). The data are processed in particular from the Halieutic System of Information of IFREMER allowing the annual edition of indices of population and stands that can be used by national and community administrations, but also within the international scientific community MEDITS.