The threat is made worse by several factors, including the giant manta ray's slow reproductive cycle and by China's strong economy (more people are now able to afford these pricey body parts).
And it's not just manta rays; many other animals face similar threats around the world. In Africa, several species of rhinos have been driven to near-extinction because of demand for their horns, which are ground up and used in traditional Chinese medicine, claimed to do anything from act as an aphrodisiac to cure cancer. Tigers have also been slaughtered by the thousands, their bones and claws used in dubious alternative medical treatments.
The real tragedy is that these animals are being killed for myths and lies. If manta ray gill rakers, white rhino horns, tiger bones, bear claws and other body parts could actually cure cancer and other diseases, scientists would be studying them to isolate the active ingredients - without further endangering wild animals.
But they don't work; these animals, and many others, are being driven toward extinction not because of some special, magical properties of their bodies, but because of human ignorance and superstition.