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Sharks have played a vital role in maintaining healthy oceans for hundreds of millions of years as a top predator. More than 450 species of sharks cruise the world’s oceans, ranging in size from 8 inches to a whopping 40 feet long. But today, nearly one in four sharks and their relatives are threatened with extinction. A major cause is the demand for shark fins. Every year, fins from as many as 73 million sharks end up in the global fin trade.

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Sea turtles have been around since the time of the dinosaurs, but all seven species in the world face potential extinction. Oceana runs proven campaigns to protect sea turtles from death as bycatch, habitat degradation and other issues.

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Cephalopods, Crustaceans, & Other Shellfish

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Cephalopods, Crustaceans, & Other Shellfish

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Cephalopods, crustaceans and other shellfish play important roles in maintaining healthy ocean systems. Cephalopods like the southern blue-ringed octopus and the vampire squid look other-worldly, while Atlantic blue crab and American lobster are the focus of major fishing industries.

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Oceans are home to a diverse assortment of corals, starfish, jellyfish, sea slugs, kelp and more. Corals are living creatures that often live in compact colonies and build up coral reefs, the biggest of which is the Great Barrier Reef off the coast of Queensland, Australia. Corals and other invertebrates face major threats from climate change and destructive fishing like dynamite fishing, bottom trawling and more.

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Dolphins, whales, sea otters and other marine mammals capture the imagination and demand the affections of people around the world. Many of these marine animals adhere to complex social systems and exhibit remarkable intelligence.

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Some estimates report the world’s oceans are home to 20,000 species of fish. Ocean fishes come in all shapes, sizes, colors and live in drastically different depths and temperatures.