Grey Reef Shark
Carcharhinus amblyrhynchos
Sighting evidence at Planet Rock, Madang
Photo: Luis P. B. · CC BY-NC
Grey reef sharks aggregate around Planet Rock's summit in numbers that reflect Madang's relatively pristine shark populations, circling the current-swept pinnacle in a behavior that combines social interaction with opportunistic hunting. Their threat display — back arching, pectoral fins dropped, exaggerated side-to-side swimming — is the most studied agonistic behavior in any shark species, and understanding its triggers has been fundamental to safe shark-diving practices worldwide.
Evidence at this site
No confirmed records on file at this site
Grey Reef Shark is listed as a curated species here based on historical reports.