NORMAL Yellowfin tuna larva, freshly hatched EXPOSEDDuring development, this yellowfin tuna larva was exposed to crude oil from the Deepwater Horizon spill. Percent of larvae with edema (laboratory setting) Poorly formed eye Malformed fins Yolksac Eye Anus Spinal cord Heart defects; irregularheartbeat Edema (buildup of fluids in tissue due to poor circulation) 100 80 60 40 20 0 0.1 0.01 1 10 Concentration of toxic polycyclic aromatic hydrocarbons, in micrograms per liter Bluefin tuna Yellowfin tuna Amberjack Typical concentrations at the surface during the spill Typical concentrations at the surface during the spill

SOURCE: Proceedings of the National Academy of Sciences.