Average metal concentrations in all whales biopsied in the Northern Gulf of Mexico in 2010, 2011, and 2012. We measured 26 metals in the whale tissues. The average concentrations of Ba, Sn, Co, Mo, Ti, Mn, Cu, Ni, Cr, Sb, Al, Fe and Mg decreased from 2010 to 2012. Meanwhile, Pb and Zn increased. Sample sizes were 41, 57, and 58 for 2010, 2011, and 2012 respectively. Data represented as mean ± standard deviation in units of μg/g tissue. (A) Metals with mean skin concentrations less than 1 μg/g; (B) Metals with mean skin concentrations between 1 and 25 μg/g and selenium; (C) Metals with mean skin concentrations greater than 50 μg/g.