deepwater horizon oil spill
One of the reports also sheds light on the effect on herring of a 1989 spill in Alaska.
The 2010 explosion of the Deepwater Horizon rig dumped millions of barrels of crude into the Gulf of Mexico and killed 11 workers.
The study findings come amid the seventh anniversary of the largest maritime oil spill.
Two supervisors in charge of safety during the Deepwater Horizon explosion were charged with 11 counts of manslaughter.
