Relative influence of prey mercury concentration, prey energy density and predator sex on sport fish mercury concentrations

► Sexual size dimorphism is common in sport fish, including walleye (Sander vitreus). ► Mercury (Hg) concentrations have been found to vary by sex in walleye. ► Prey Hg concentration was the most influential factor on walleye contamination. ► Knowing sport fish diet and sex could help anglers assess mercury exposure risk.