Oceanic Whitetip Sharks, Carcharhinus longimanus
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Description & Behavior
Oceanic whitetip sharks, Carcharhinus longimanus (Poey, 1861), aka white-tipped shark, whitetip oceanic shark and whitetip shark, are large stocky sharks with a huge, rounded first dorsal fins and long, wide-tipped pectoral fins. Their snouts are blunt and rounded; their upper teeth are triangular and they have an interdorsal ridge. Their dorsal side (upper) is usually dark gray with a bronze tinge, sometimes brown or blue; and their ventral (lower) side is white, sometimes with a yellow tinge and the tips of their first dorsal, pectorals, and lower lobe of their caudal (tail) fins are often white or have white spots. Their ventral surface of their pelvic fins, apices (tips) of anal and second dorsal fins, and ventral lobe of the caudal fin often have black spots and black or dusky saddle-marks are found in front of their second dorsal fin and along the upper margin of their caudal fin. They grow up to 4 m in total length with a maximum weight of 168 kg and age of 22 years.
Oceanic whitetip sharks are an oceanic deep-water species which sometimes comes close to shore. They are found from the surface to depths of at least 150 m. They are frequently accompanied by remora, Coryphaena, pilot fishes, and sea turtles.
One of the more interesting facets of the oceanic whitetip's behavior is its association with the shortfin pilot whale, Globicephala macrorhynchus, off Hawaii, as described by Jeremy Stafford-Deitsch (1988). Oceanic whitetips are often found swimming with big pods of pilot whales, and often follow the whales when they dive down into the depths. The reason whitetips hang around pilot whales is not known, but it is presumed that the sharks follow the whales to feed on squid found at depth by the whales. This behavior likely occurs in Hawaiian waters, and other areas where pilot whales and whitetips share habitat.
World Range & Habitat
Western Atlantic: Maine, USA to Argentina; also in Gulf of Mexico and Caribbean; Eastern Atlantic: Portugal to Gulf of Guinea; possibly occurring in the Mediterranean; Indo-Pacific: Red Sea and East Africa to the Hawaiian, Samoan, Tahiti and Tuamoto islands; Eastern Pacific: southern California, USA to Peru, including the Galapagos. Oceanic whitetip sharks are a highly migratory species.
Feeding Behavior (Ecology)
Oceanic whitetip sharks feed on oceanic bony fishes, including tuna and mahi-mahi (dolphinfish, Coryphaena hippurus), threadfins, stingrays, sea turtles, sea birds, gastropods (snails), squid, crustaceans, mammal carrion and sometimes even garbage.
Conservation Status & Comments
This is an active, almost fearless shark also associated with human attacks. MarineBio considers this shark the most potentially dangerous after great whites, tiger, and bull sharks, especially for open-ocean divers. This species is likely responsible for open-ocean attacks following air or sea disasters. Oceanic whitetips can be very aggressive and unpredictable in the presence of potential prey. Sold commercially fresh, frozen, smoked, and dried-salted for human consumption; hides for leather, fins for shark fin soup, liver oil for vitamins, and processed into fishmeal.
This species is a widespread and common large pelagic shark of warm oceanic waters. It presumably has a low reproductive capacity, but is extremely abundant and wide-ranging and is subject to fishery pressure as a common bycatch species with tuna and other pelagic species. This bycatch is reportedly either inadequately reported or unrecorded. The fins are highly prized in trade although the carcass is often discarded. Fishery pressure is likely to persist, if not increase in future, and the impact of this fishing pressure is presently unknown.
The oceanic whitetip shark, Carcharhinus longimanus, is listed as Vulnerable (VU A2ad+3d+4ad) on the IUCN Red List of Threatened Species:
A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable (see Section V), and it is therefore considered to be facing a high risk of extinction in the wild.
References & Further Research
Research Carcharhinus longimanus » Barcode of Life ~ BioOne ~ Biodiversity Heritage Library ~ CITES ~ Cornell Macaulay Library [audio / video] ~ Encyclopedia of Life (EOL) ~ ESA Online Journals ~ FishBase ~ Florida Museum of Natural History Ichthyology Department ~ GBIF ~ Google Scholar ~ ITIS ~ IUCN RedList (Threatened Status) ~ Marine Species Identification Portal ~ NCBI (PubMed, GenBank, etc.) ~ Ocean Biogeographic Information System ~ PLOS ~ SIRIS ~ Tree of Life Web Project ~ UNEP-WCMC Species Database ~ WoRMS
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