Dr. Demian Chapman - a study of Stone Brook University in New York City, USA - and colleagues have conducted a thorough survey to calculate the exact number of sharks killed, BBC reported . They found that the difference between the amount previously reported huge. For example, in 2012, from 63 to 273 million sharks were killed. "If, on average, the number of sharks are killed each year up to 100 million. This figure is a best estimate that we had " , "Many sharks are caught sharks need more than 10 years to reach reproductive age. Thus, their reproduction rate will fall behind the rate at which humans remove them out of the ocean, "Chapman it
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