Species- and size-specific variability of mercury concentrations in four commercially important finfish and their prey from the northwest Atlantic

► Hg concentrations were analyzed as a function of size, season, and diet in four marine finfish. ► Mean Hg concentrations and bioaccumulation rates varied significantly among fish species. ► Prey burdens and predator foraging habits are discussed as factors influencing Hg accumulation. ► Species- and size-specific information may be used to inform decisions on which fish to consume.