Grey Reef Shark
Carcharhinus amblyrhynchos
Sighting evidence at Blue Hole, Guam, Mariana Islands (Guam & Saipan)
Photo: Luis P. B. · CC BY-NC
Grey reef sharks patrol the wall face outside the Blue Hole arch in groups of 3 to 10, taking advantage of the upwelling that the steep drop-off creates to ambush fish swept off the reef edge by current. Their frequency of appearance immediately on exiting the arch has made the Blue Hole a reliable shark encounter site even for divers who find open-ocean blue-water dives daunting.
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.