Gia Lộc BÌNH THUẬN — During a dive on a small island off the coast of Bình Thuận Province, Nguyễn Văn Giởi and other tour guides were able to see hundreds of poisonous crown-of-thorns starfish, which are coral predators. “When diving to look at coral reefs on Hòn Tranh isle, we saw crown-of-thorns starfish seriously devastate the coral reefs,” said Giởi, a tour guide on Phú Quý Island in the south-central coastal province. He and other tour guides on the larger island of Phú Quý decided to set up a team "to catch these poisonous crown-of-thorns starfish to save coral."