A third of shark species face extinction. Here’s what one man is doing to help. Today Cardeñosa is fighting the illegal trade of endangered sharks as a Distinguished Postdoctoral scholar at Florida International University in Miami. The marine biologist is using molecular and forensic tools to combat smuggling that stretches from Hong Kong to Latin America. One of the biggest challenges for law enforcement at ports around the world is determining whether shipments of shark fins and meat are violating CITES - The Convention on International Trade in Endangered Species of Wild Fauna and Flora. “A lot of the fins look the same,” explained Cardeñosa. “How can you tell whether a shark fin that is coming into the country is legal or illegal, is from a species that is regulated or not regulated?”