Grey reef shark

Photo: Luis P. B. · CC BY-NC

One of the Indo-Pacific's most abundant reef sharks and a defining presence on healthy coral reefs. Grey reef sharks are mid-water patrollers, typically seen in small groups or alone along reef edges and drop-offs. They are curious rather than aggressive, often circling divers at a consistent distance. A distinctive threat display — arched back, depressed pectoral fins, exaggerated swimming — signals discomfort if divers approach too closely. Near threatened; their numbers have declined sharply in areas with intensive fishing.