A waitress serving shark fin soup in a restaurant in Guangzhou, in southern China's Guangdong province. Environmental and animal rights groups have campaigned for decades against consumption of shark fin, arguing that demand for the delicacy has decimated the world's shark population and that the methods used to obtain it are inhumane.
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These dead sharks were discovered aboard a Chinese-flagged vessel found off Ecuador earlier this month with some 300 tons of marine species, several of which are in danger of extinction.
Galapagos National Park via AP
The long lifespan of the Greenland shark, shown here in the cold, deep waters of the Uummannaq Fjord, may only be surpassed by that of the ocean quahog, a clam known to live as long as 507 years.
Marine ecologist Neil Hammerschlag says he can sometimes identify sharks like Emma (pictured) by the way they move. "It's pretty cool to be able to jump in the water and say, 'Hey look, there's Emma the tiger shark!' "
A frilled shark swims in a tank after being found by a fisherman off Japan's coast in 2007. One of the rare creatures was recently caught in Australia, shocking fishermen.
Awashima Marine Park/Getty Images