Carcharhinus amblyrhynchos (Bleeker, 1856)
Blacktail reef shark
Carcharhinus amblyrhynchos
photo by Randall, J.E.

Family:  Carcharhinidae (Requiem sharks)
Max. size:  255 cm TL (male/unsexed); 172 cm TL (female); max.weight: 34 kg; max. reported age: 25 years
Environment:  reef-associated; marine; depth range 0 - 1000 m, oceanodromous
Distribution:  Indo-West Pacific to Central Pacific: Madagascar and the Mauritius-Seychelles area to Tuamoto Archipelago; north to southern China; south to northern Australia.
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 0-0; Anal spines: 0-0; Anal soft rays: 0-0. Dark grey or bronze-grey above, white below; caudal fin with a conspicuous wide black posterior margin; undersides of pectoral and pelvic fins with black tips and posterior margins, but fins otherwise not conspicuously black or white-tipped except for white-tipped first dorsal in some individuals (Ref. 9997).
Biology:  Occurs on continental and insular shelves and oceanic waters adjacent to them (Ref. 244). Common on coral reefs, often in deeper areas near drop-offs to the open sea, in atoll passes, and in shallow lagoons adjacent to areas of strong currents (Ref. 244). Coastal-pelagic near the bottom, near drop-offs at 1-275 m (Ref. 58302). Forms daytime schools or aggregations in favored areas (Ref. 244). Although active during the day, it is more active nocturnally (Ref. 244). Viviparous, with 1-6 pups (Ref. 37816). Feeds on reef fishes, squids, octopi, crabs, lobsters and shrimps (Ref. 244, 5578). Tends to be aggressive under baited conditions (Ref. 6871) and readily enters into a frenzy feeding pattern, at which time it may become quite dangerous. Repeatedly incriminated in human attacks. Utilized for human consumption, fishmeal, and other shark products. Minimum depth from Ref. 6871. Maximum length of female taken from Ref. 5213.
IUCN Red List Status: Endangered (EN); Date assessed: 03 July 2020 (A2bcd) Ref. (126983)
Threat to humans:  traumatogenic
Country info:  Probably reported (in part) as Carcharias menisorrah from Manila Bay (Ref. 288) and Cebu (Ref. 280). Collected from Luzon Point (USNM 151232, female, 62.1 cm TL and male, 67 cm TL) (Ref. 288). Observed during dives at Tubbataha Reef, central Sulu Sea in April 2000 (Ref. 47737). Recorded from Lanuza Bay, Surigao del Sur (Ref. 104756) and Sulu-Celebes Sea (Ref. 244). Also Ref. 9997, 6871, 26842, 53416, 121724. Occurrence: Manila Bay; Cebu; Lanuza Bay, Surigao del Sur; Tubbataha Reef, central Sulu Sea.

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