An extensive study of 16,000 shark fin samples taken from Hong Kong retail markets has found that 6.5 per cent of them were from globally protected species, surpassing the figure officially declared by local authorities under an international agreement. The study, published in Science Advances on Monday, also revealed a disparity: the volume of critically endangered oceanic whitetip shark fins sold in the city was 70 times higher than what officials reported under the Convention on International...