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Last December, scientists announced that dolphins in Louisiana were experiencing lung diseases and low birthrates in the wake of the Deepwater Horizon oil spill that released more than 636 million liters of crude oil into the Gulf of Mexico in 2010. Now, researchers have also found evidence of potentially lethal heart defects in two species of tuna and one species of amberjack — all economically important species for commercial fisheries. This news, published in the Proceedings of the National Academy of Sciences today, comes less than a week after the announcement that BP will once again be allowed to explore the Gulf of Mexico for oil. To study the effects of the BP oil disaster, scientists recreated the oceanic environment that yellowfin amberjack, yellowfin tuna and bluefin tuna larvae would have encountered in 2010 in the lab. They did so by introducing the larvae to Deepwater Horizon oil samples at environmental conditions that matched those of the spill.