This page was last edited on 17 April 2021, at 12:20. (2006). One of the most common sharks found on Indo-Pacific coral reefs, the whitetip reef shark occurs as far west as South Africa and as far east as Central America. On the other hand, if the female is willing, the pair settles side-by-side with their heads pressed against the bottom and their bodies at an upward angle. The IUCN has assessed the whitetip reef shark as Vulnerable, noting its numbers are dwindling due to increasing levels of unregulated fishing activity across its range. [2], The first dorsal fin is positioned well back on the body, closer to the pelvic than the pectoral fins. Between 13 and 15 teeth are on either side of the symphysis. The maximum length this species attains is often given as 2.1 m (6.9 ft), though this was originally based on visual observations and may be dubious. The Blue Shark is one of the most beautiful of all sharks. Whitetips commonly compete for food with silky sharks, making up for its comparatively leisurely swimming style with aggressive displays. [2] His choice of the specific epithet obesus was curious, given that this shark is actually quite slender. Robbins, W.D. Their instinct is to follow baitfish migrations that accompany ocean-going ships. Habitat: At depths of about 25-130 ft near coral reefs; seen resting in caves, sometimes for extended periods : To … They reach up … [23], Unlike its Oceanic cousin, the white tip reef shark is more harmless and is seldom aggressive unless provoked. To resume swimming they’ll propel themselves forward with their tail. [3] Recent studies show steeply declining populations because its large fins are highly valued as the chief ingredient of shark fin soup, and as with other shark species, the whitetip faces mounting fishing pressure throughout its range. [6], The rules of the International Commission on Zoological Nomenclature are that in general the first-published description has priority; therefore, the valid scientific name for the oceanic whitetip shark should be Carcharhinus maou. However, Lesson's name remained forgotten for so long that Carcharhinus longimanus remains widely accepted. Froese, Rainer and Pauly, Daniel, eds. Alternatively, it is rather clumsy when attempting to take food suspended in open water. According to longline capture data, increasing distance from land correlates to a greater population of sharks. Megalodon died out 1.6 million years ago. [2] On occasion, they may enter water less than 1 m deep, and there is an exceptional record of a whitetip reef shark being captured from a depth of 330 m (1,080 ft) in the Ryukyu Islands. [8] Despite their nocturnal habits, whitetip reef sharks will hunt opportunistically in daytime. The broad, triangular pectoral fins originate at or slightly before the level of the fifth gill slit. The whitetip reef shark (Triaenodon obesus) is a species of requiem shark, in the family Carcharhinidae, and the only member of its genus.A small shark that does not usually exceed 1.6 m (5.2 ft) in length, this species is easily recognizable by its slender body and short but broad head, as well as tubular skin flaps beside the nostrils, oval eyes with vertical pupils, and white … [8], The shark spends most of its time in the upper layer of the ocean—to a depth of 150 m (490 ft)[2]—and prefers off-shore, deep-ocean areas. [5] Off Borneo, this species gathers around reef drop-offs to feed on food brought up by the rising current. Whitetip reef sharks are rarely aggressive towards humans, though they may investigate swimmers closely. [4] The whitetip reef shark has a slim body and a short, broad head. If a bull, tiger or white shark is captured, where possible and safe to do so the contractor will tag the shark with an acoustic tag and/or dart tag and release it. [12], The oceanic whitetip is usually solitary and slow-moving, and tends to cruise near the top of the water column, covering vast stretches of empty water scanning for possible food sources. [2][5] The International Union for Conservation of Nature (IUCN) has assessed this species as Vulnerable, as its numbers have dropped in recent decades due to increasing, and thus far unregulated, fishing pressure in the tropics. [24], In 1969, Lineaweaver and Backus wrote of the oceanic whitetip: "[it is] extraordinarily abundant, perhaps the most abundant large animal, large being over 100 pounds [45 kg], on the face of the earth". The number of offspring is not correlated with female size; each female produces an estimated average of 12 pups over her entire lifetime. One hundred and ninety-two people survived; many deaths were attributed to the whitetip. [2], Associated almost exclusively with coral reef habitats, whitetip reef sharks are most often encountered around coral heads and ledges with high vertical relief, and additionally over sandy flats, in lagoons, and near drop-offs to deeper water. Unfortunately, it’s also one of the most over fished sharks in the world. [1] [9] As of 2008, the International Shark Attack File lists two provoked and three unprovoked attacks to this species. Furthermore, populations in no-take zones, where boats are allowed but fishing prohibited, exhibit levels of depletion comparable to fishing zones due to poaching. [17], Mating is initiated when up to five males follow closely behind a female and bite at her fins and body, possibly cued by pheromones indicating the female's readiness. Reproduction. [3] Later in 1837, Johannes Müller and Friedrich Henle moved this species into its own genus Triaenodon, from the Greek triaena meaning "trident", and odon meaning "tooth". [24] Whitetip reef sharks are well-suited to ecotourism diving, and with conditioning they can be hand-fed by divers. Individuals may stay within a particular area of the reef for months or years, frequently returning to the same shelter. The second dorsal and anal fins are large, about half to three-quarters as high as the first dorsal fin. [6] Its swimming style is slow, with widely spread pectoral fins. Males attain sexual maturity at 1.7 to 1.9 m (5.6 to 6.2 ft) and females about 1.8 to 2.0 m (5.9 to 6.6 ft). The oceanic whitetip shark (Carcharhinus longimanus), also known as Brown Milbert's sand bar shark, brown shark, lesser white shark, nigano shark, oceanic white-tipped whaler, and silvertip shark, is a large pelagic requiem shark inhabiting tropical and warm temperate seas. Image of a Tiger shark in the Bahamas by David Snyder. (2013). [5] Morphological and molecular phylogenetic analyses suggest the whitetip reef shark is grouped with the lemon sharks (Negaprion) and the sliteye shark (Loxodon) in occupying an intermediate position on the carcharhinid evolutionary tree, between most basal genera (Galeocerdo, Rhizoprionodon, and Scoliodon) and the most derived (Carcharhinus and Sphyrna). [31], On 30 January 2018, NOAA Fisheries published a final rule to list the oceanic whitetip shark as a threatened species under the United States Endangered Species Act (ESA) (83 FR 4153). At night, whitetip reef sharks emerge to hunt bony fishes, crustaceans, and octopus in groups, their elongate bodies allowing them to force their way into crevices and holes to extract hidden prey. Sharks are found in all seas. Also known as the Prionace Glauca, they are easy to identify because of their special slim, torpedo shaped figures. Another study focusing on the Gulf of Mexico, using a mix of data from US pelagic longline surveys from the mid-1950s and observations from the late 1990s, estimated a decline in numbers in this location of 99.3% over this period. as an excuse for smacking your little brother? They are slow moving but very aggressive and large enough to … Demographic models indicate that these depleted populations will continue to decline by 6.6–8.3% per year without additional conservation measures. The daytime home range of a whitetip reef shark is limited to approximately 0.05 km2 (0.019 sq mi); at night this range increases to 1 km2 (0.39 sq mi). A saddle-like marking may be apparent between first and second dorsal fins. [16] Despite the greater notoriety of the great white shark and other sharks habitually found nearer the shore, the oceanic whitetip is suspected to be responsible for many fatal shark bites on humans, as a result of predation on survivors of shipwrecks or downed aircraft. Carcharias obesus Rüppell, 1837 Its gestation period is one year. [6], The whitetip reef shark is distributed widely across the entire Indo-Pacific region. Whitetip sharks are just about the last animal you want to meet in open waters after a boat or plane wreck. [8][13][14] It is especially sensitive to natural and artificial low-frequency sounds in the 25–100 Hz range, which evoke struggling fish. The eyes are small and oval with vertical pupils and prominent ridges above, and are often followed by a small notch. Whitetip reef shark (Hawaiian: mano lalakea) Triaenodon obesus. [7] In the Indian Ocean, it occurs from northern KwaZulu-Natal, South Africa to the Red Sea and the Indian subcontinent, including Madagascar, Mauritius, the Comoros, the Aldabra Group, the Seychelles, Sri Lanka, and the Chagos Archipelago. Along with white tips, the fins may be mottled, and young specimens can have black marks. Many sharks, including the whitetip reef shark are cooperative feeders and hunt in packs to herd and capture elusive prey. The average length is 1.6 to 2.5 meters (about 5 to 8 feet) and weighs approximately 15 to 20 kilograms (about 33 to 44 pounds). Range and habitat. After dusk, groups of sharks methodically scour the reef, often breaking off pieces of coral in their vigorous pursuit of prey. [6] In 1988, Jeremy Stafford-Deitsch reported seeing an individual accompanied by a shortfin pilot whale. ONR Technical Report 2, No. [5], Like other members of its family, the whitetip reef shark is viviparous; once the developing embryos exhaust their supply of yolk, the yolk sac is converted into a placental connection through which the mother delivers nourishment for the remainder of gestation. [6] The denticles lie flat and typically have between five and seven ridges. As a result of these findings, its status on the IUCN Red List was moved to "Critically Endangered" globally. [7] The oceanic whitetip shark is a medium-sized requiem shark. The oceanic whitetip, porbeagle and three hammerhead species are some of the shark species of concern for WWF, where the impact of trade is contributing to declines in populations. A very strange, but almost harmless hunter of the night, the Whitetip Reef Shark is professionally called the Triaenodon Obesus. Triaenodon apicalis Whitley, 1939. Provoked vs. Unprovoked Attacks. The oceanic whitetip was included in the study. [6] The oceanic whitetip shark has many common names in English: Brown Milbert's sand bar shark, brown shark, nigano shark, oceanic white-tipped whaler, and whitetip shark. The fins are significantly larger than most other shark species, and are conspicuously rounded. [7] The shark is viviparous—embryos develop in utero and are fed by a placental sac. Have you ever used "he hit me first!" International Commission on Zoological Nomenclature, "Shifting baselines and the decline of pelagic sharks in the Gulf of Mexico", "Consideration of Proposals for Amendment of Appendices I and II (CoP15 Prop. [2] In September 2004, a 2.3 m (7.5 ft) vagrant oceanic whitetip shark was seen in the brackish waters of Gullmarsfjorden in Sweden; it died shortly after. [1], The oceanic whitetip is a commercially important species for its fins, meat, and oil. [9], Whitetip reef sharks generally remain within a highly localized area; only rarely do they undertake long movements, wandering for a while before settling down somewhere new. [20] However, according to survivor accounts published in several books about sharks and shark attacks, potentially hundreds of the Indianapolis crew were killed by sharks before a plane spotted them on the 5th day after the sinking. When whaling took place in warm waters, oceanic whitetips were often responsible for much of the damage to floating carcasses. An individual shark may rest inside the same cave for months to years. [5] In some places, local whitetip reef sharks have learned to associate the sound of a speargun discharge or a boat dropping anchor with food and respond within seconds. Whitetip Reef Shark . Nonetheless, the white, tiger and bull sharks are the “Big Three” in the shark attack world because they are large species that are capable of inflicting serious injuries to a victim, are commonly found in areas where humans enter the water, and have teeth designed to shear rather than hold. [6] A whitetip reef shark can survive for six weeks without food. Unusually, there is also a report of seven whitetip reef sharks adopting a cleaning posture (mouth agape and gills flared) in the midst of a swarm of non-cleaning hyperiid amphipods; the mechanical stimulation from the moving amphipods are thought to have evoked this behavior through their similarity to actual cleaner organisms. In the 1990s, the sharks of the species from the same area averaged only 56.1 kg (124 lb). The largest specimen ever caught measured 4 m (13 ft), an exceptionally large size considering few specimens are known to exceed a length of 3 m (9.8 ft). Once engaged, the sharks sink to the bottom, whereupon the male (or males) rotates one of his claspers forward, inflates the associated siphon sac (a subcutaneous abdominal organ that takes in seawater that is used to flush sperm into the female), and attempts to make contact with the female's vent. [5] The name Pterolamiops longimanus has also been used. [1] On the Great Barrier Reef, populations of whitetip reef sharks in fishing zones have been reduced by 80% relative to no-entry zones. The female is typically larger than the male by 10 cm (3.9 in). On the next page, meet the blue shark. The snout is flattened and blunt, with large flaps of skin in front of the nares that are furled into tubes. Under the 1995 UN Agreement on the Conservation and Management of Straddling Fish Stocks and Highly Migratory Fish Stocks, coastal and fishing states are specifically required to adopt measures to conserve listed species, but little progress is visible on the oceanic whitetip. [5] Sexual maturity is reached at a length of around 1.1 m (3.6 ft) and an age of 8–9 years, though mature males as small as 95 cm (37 in) long have been recorded from the Maldives, suggesting regional variation in maturation size. [5], The whitetip reef shark is one of the three most common sharks inhabiting the reefs of the Indo-Pacific, the other two being the blacktip reef shark (Carcharhinus melanopterus) and the grey reef shark (Carcharhinus amblyrhynchos). The whitetip isn't the only deep-water shark known to take an interest in whoever's bobbing in its feeding area, though. Each shark hunts for itself and in competition with the others in its group. The whitetip reef shark (Triaenodon obesus) is a species of requiem shark, in the family Carcharhinidae, and the only member of its genus. The male has a limited time in which to achieve copulation, as while he is holding the female's pectoral fin in his mouth he is being deprived of oxygen. The habitat preferences of this species overlap those of the other two, though it does not tend to frequent very shallow water like the blacktip reef shark, nor the outer reef like the grey reef shark. [5] Known parasites of the whitetip reef shark include the copepod Paralebion elongatus and the praniza (parasitic) larvae of the isopod Gnathia grandilaris. It was once thought to have formerly existed in the Atlantic Ocean, based on fossil teeth found in North Carolina dating to the Miocene epoch. [17] Parturition occurs from May to August (autumn and winter) in French Polynesia, in July (summer) off Enewetak Atoll, and in October (summer) off Australia. 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