According to a 2013 study , a single manta ray might fetch five to six million rupiah (US$350-420) at market, while a living animal could make up to 12 billion rupiah for the tourism industry over its lifetime.
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The short answer is no; manta rays don't pose much of a threat to humans in terms of physical harm. Unlike other species such as sharks or stingrays, which may attack if provoked or startled, manta rays are typically passive and docile animals who do not display aggressive behavior towards people.
Researchers found that black mantas were common in some locations, making up 40% of some populations. Strangely, they were completely absent in others.
The natural predators of manta rays are a few types of sharks, killer whales and false killer whales. Occasionally you may see a manta with the characteristic 'half-moon' shark bite on it's wing. But the real danger to these sea creatures is, as always, humans and their activities.
While swimming in chest-deep water, Steve Irwin approached a short-tail stingray, with an approximate span of two metres (6 ft 7 in), from the rear, in order to film it swimming away. He initially believed he had only a punctured lung; however, the stingray's barb pierced his heart, causing him to bleed to death.