The geodatabase on first sales of fish in the EU was created in 2016 by Cogea for the European Marine Observation and Data Network (EMODnet). It originates from the data on monthly first sales of fish made available by the European Market for Fisheries and Aquaculture products (EUMOFA). EUMOFA data have been related to the fish ports locations made available in DG MARE's Master Data Register, revised when necessary according to the United Nations Code for Trade and Transport Locations database (UN/LOCODE) and according to the EUROSTAT/GISCO dataset on main ports locations. Fish species have been grouped into EUMOFA's aggregations such as Commodity Groups (CG) and Main Commercial Species (MCS). For each fish species in each place of sale, volume (net weight in kg), value (Euro) and price (Euro/kg) are provided on a monthly basis by year of reference, CG, MCS and country. The 2017 update of the dataset also includes information on fish presentation (e.g. whole, headed, gutted, etc.) and preservation state (e.g. fresh, frozen, etc.). Information on presentation and preservations state are also retrieved from EUMOFA. The geographical coverage of data is: Belgium, Germany, Denmark, Estonia, France, Ireland, Italy, Latvia, Lithuania, the Netherlands, Norway, Poland, Portugal, Spain, Sweden and the UK. The dataset is updated twice a year. It covers a time series from 2007 to 2017 (not complete). The EUMOFA is a fully-fledged observatory, but is also a work in progress: its coverage may be extended in the future.