A Pacific bluefin tuna. (Randy Wilder / Monterey Bay Aquarium)
An Atlantic bluefin tuna. (Gilbert Van Ryckevorsel / TAG A Giant)
The scene in the Gulf of Mexico shortly after the BP oil spill caused by the Deepwater Horizon rig explosion in 2010. (National Oceanic and Atmospheric Assn. )
An oil slick from the BP spill in the Gulf of Mexico is evident about 12 miles east of Pass-a-Loutre, La., on May 25, 2010.