Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays. However, the term "shark"... MORE
Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus. Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Since then, sharks have diversified into over 470 species. They range in size from the small dwarf lanternshark, a deep sea species of only 17 centimetres in length, to the whale shark, the largest fish in the world, which reaches approximately 12 metres in length. Sharks are found in all seas and are common to depths of 2,000 metres. They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can survive and be found in both seawater and freshwater. They breathe through five to seven gill slits. LESS
A diver sedates a shark by flipping it upside down to remove a hook protruding from its mouth. Friends Cameron Nimmo and Randy Jordan have made it their mission to help sharks that have been pierced with fishing hooks and remove them from their mouths, noses, and bodies. The hooks are often left in the sharks after being caught and released by fishermen. The pair, who go by the name Shark Addicts, came across a 6ft Silky shark while swimming off the coast of Jupiter in Florida, USA earlier this month. During the encounter Randy gently turns the shark upside down while Cameron removes the hook. Randy, who also runs Emerald Charter boat tours, says on average about 75 percent of the ten to twenty sharks they encounter have hooks in them. The pair hope their videos will raise awareness about sharks' precarious position in the ecosystem and show that humans pose more of a threat to them than they do to us. Videographer / Director: Candid Producer: Samantha Grillo Editor: Joshua Douglas
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