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TUNA
Some tuna can swim nearly 50 mph, but that’s still not fast enough to out-swim mercury contamination, which seeps into its habitat from industrial pollution. Some of the larger species of these ocean-dwelling fish, such as the blue fin, have the ability to raise their blood temperature, allowing them to maintain that high speed in colder water. Blue fin are an unfortunately popular fish, so popular that many experts now believe they could now be endangered with extinction.
"I spend almost as much time in the oceans as I do in the pool. I've noticed a lot of scary things out there - fewer fish and more pollution. Instead of just accepting this new ocean reality, I decided to get involved and try to make things better. After a bit of research, I discovered Oceana - a group that was already working to protect the things I care about. I told them I'd like to get involved in ocean protection." -- Aaron Peirsol, Olympic swimmer