Mercury concentrations and isotopic data in hake (Merluccius merluccius), red mullet (Mullus surmuletus) and common sole (solea solea)

This dataset gather isotopic ratios (carbon and nitrogen) and concentrations of mercury species (methyl and inorganic mercury) measured in several tissues (muscle, liver and gonad) for three commonly consumed fish species from the south Bay of Biscay (France) in 2017 and 2018.