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, Gulf of Lion -GoL) and in the NE Atlantic (Bay of Biscay -BoB): sizes (in cm), stable isotope ratios (? 13 C and ? 15 N values in?) and muscle total Hg (T-Hg) concentrations (in mg g -1 dm) for the individuals analysed for the three parameters (N = 134); sizes (in cm), methyl-Hg (Me-Hg) concentrations, Table 1. Characteristics of fish and crustaceans considered in the NWMediterranean

/. Mehg and . Ratio, %) for the subsample of individuals analysed for Me-Hg concentrations, vol.75

, either derived from dedicated individual measures (for five of the seven Atlantic species) or from the general literature (US EPA, 2011; in brackets) is also indicated, for further conversion of Hg concentrations in wet mass if needed (i.e. for comparison with seafood Hg standards). (nd) = not determined. a Total length for fish, The water content (WC) of the muscle tissue (in %)

, Selected correspondence (closest) species in US EPA (2011): S. canicula and G. melastomus = "Sharks, mixed species

H. , Rockfish

L. , Flatfish, Flounder, and Sole

P. Cod, Atlantic

M. Whiting,