- Gray reef shark
name = Gray reef shark
status = LR/nt | status_system = IUCN2.3
trend = unknown
image_width = 250px
phylum = Chordata
genus = "
species = "C. amblyrhynchos"
binomial = "Carcharhinus amblyrhynchos"
binomial_authority = (Bleeker,
range_map_width = 250px
range_map_caption = Range of gray reef shark
The gray reef shark, "Carcharhinus amblyrhynchos", is one of the most common
sharks in Indo-Pacificwaters, from the Red Seato Easter Island. It is found at depths down to about 250 m in lagoons and close to islands and coral reefs.
As its name suggests, the shark is grey overall, with a white underside. The tips of most fins, except the first
dorsal fin, are darker, and the trailing edge of the caudal finhas a prominent black margin. Some individuals have a white pattern on the leading edge of the dorsal fin. It has been recorded at up to 2.55 m. The blacktip reef sharklooks similar, and is also common, but it is distinguished by a black tip on the first dorsal fin.
They are active during the day, but more so at night, feeding on reef fishes,
squids, octopus, and various crustaceans such as crabs and shrimp.
This species is social, aggregating in favored areas, often near dropoffs at the edge of a reef, or in atoll passes where there is a strong current. They are often curious, will investigate scuba divers, and have been implicated in attacks, although there is some debate as to whether the sharks are fundamentally aggressive or have simply reacted badly to perceived threats by divers. When threatened they exhibit a distinctive threat behaviour, adopting a hunched posture with the body bent into an "S" shape.
viviparous, with 1 to 6 pups in a litter.
The numbers of grey reef sharks have declined in recent years.
* Database entry includes justification for why this species is near threatened
*Community monitoring of reef sharks in the Coral Sea and Great Barrier Reef, Australia (2008) [http://www.auf-spearfishing.com.au/Documentation/Coral%20Sea%20Shark%20Report%202008-7.pdf Australian Underwater Federation]
* [http://www.elasmo-research.org/education/topics/b_agonism.htm Elasmo Research page on agonistic behavior]
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