This dataset contains information on infaunal abundance & biomass from sediment grabs in Belfast Lough as part of a larger & ongoing habitat mapping project. The sediment & infaunal survey was carried out in January 2018 by AFBI and this dataset was integrated into the larger mapping project since 2012. The project is joint with the British Geological Society and Belfast Harbour with the aim of mapping the seabed floor and updating it from more historical information.