A diver glides over an expanse of bone-white coral branches, recording the fish that dart between the ghostly arms extending from the sea floor off the Thai island of Koh Tao. Nannalin ...

One inch of the coral’s light brown tips was bumpy with living polyps, while the rest was dull white, resembling a dead tree ...

Alex Mustard (UK) shows the biodiversity of a healthy coral reef as ghost gobies swim within the branches of a sea fan. Alex is particularly fond of gobies. These little fish are normally skittish, ...