Grey Reef Shark

Photo: Mark Rosenstein · CC BY-NC

Grey reef sharks congregate at Naingoro Pass in schools of 10-30 individuals, using the tidal channel as a feeding highway where prey fish concentrate in the current. These sharks are strongly associated with reef passes throughout the Indo-Pacific and exhibit bold threat displays — arching the back and lowering the pectoral fins — when approached too closely, requiring divers to maintain respectful distances. Population studies in Fijian waters suggest resident shark schools form stable social groups with recognisable dominance hierarchies.