The Speartooth River Shark is the largest of these species, as it can reach 2.6 m (8.5 ft). Author: (Müller and Henle, 1839) Field Marks:A fairly stocky requiem shark with a broadly rounded short snout, preoral snout much shorter than mouth width but with a rather long preorbital snout, minute eyes, first dorsal origin over rear ends of pectoral bases, second dorsal rather large, about 1/2 height of first dorsal, upper teeth with high, broad, serrated triangular cusps, lower anterior teeth with long, hooked, protruding cusps having unserrated cutting edges not confined to spearlike tips and crown feet with low cusplets, no interdorsal ridge, upper precaudal pit longitudinal, no conspicuous markings.Diagnostic Features:First few anterior teeth in lower jaw with cutting edges along entire cusp, giving the cusps a clawlike shape, and low cusplets; second dorsal lower, about half the height of first dorsal.Geographical Distribution:Indo-West Pacific: Definitely known from the Hooghly River, Ganges system, West Bengal, India, and likely from the vicinity of Karachi, Pakistan (see remarks below).Habitat and Biology:A poorly known freshwater riverine and possibly inshore marine and estuarine shark. Though they are protected under India's 1972 Wildlife Protection Act, Ganges sharks are still fished for meat and international trade. 5. Pondicherry Shark (Carcharhinus hemiodon) Habitat: Indo-Pacific; coastal waters and possibly the … Reaching up to 178 cm in length, the Ganges shark is typically characterised by a uniform grey or brown color and has no distinguishing markings of any kind. The Ganges shark, Glyphis gangeticus, is listed as a critically endangered species on the IUCN red list. It is just one of… READ MORE Wetlands are the favorite habitats of the fishing cat. Given the species’ relatively conventional appearance, it is often mistaken for the more common bull shark. The name also refers to their pugnacious nature and a tendency to head-butt their prey as a … Adults grow to about 178 cm in length and give birth to live ones. 3. Its population has been steadily decreasing due to over fishing, habitat degradation, increasing river utilisation, and building of dams. G. gangeticusis a little-known species that is yet to be adequately described. The Ganges shark is potentially dangerous because of its size and large teeth, but at present its relation to humans is a mystery, along with almost all other aspects of its biology. First, the species is an apex predator and as such, is characterised by generally low population sizes, as well as long gestation periods, delayed maturity, and small litter sizes. Although sharks are currently caught in the Ganges system (P.K. Although Garrick (1982) had not examined specimens of leucas from the Indian subcontinent, the writer found leucas material from Cochin and Bombay as well as the Hooghly specimen.Thus there are two species of sharks in the Hooghly River, and, with the well-known affinities of C. leucas for fresh water, probably two Ganges River sharks as well. The species is also thought to travel by as much as 100 km in either direction of its place of birth. The Ganges Shark, Glyphis gangeticus, is a freshwater riverine, and possibly also inshore marine/estuarine, shark that is very poorly understood. Average Size and Length: The Ganges shark is estimated 5.83 feet at maturity, with a maximum length of about 6.67 feet. They may grow to a mature length of 200 cm (78.74 inches). 13. The Ganges shark is one of the few river sharks. All river sharks appear to be able to tolerate low to reduced salinity environments. comm. The teeth of the Ganges shark appear more suitable for fish-impaling and less useful for dismembering tough mammalian prey than the very stout teeth of the bull shark. The shark is protected under Schedule 1 of the Wildlife (Protection) Act, 1972 and capture, killing or sale of it is punishable by law. Talwar, pers. Like many apex predators, Ganges sharks are thought to help regulate the size of prey populations and provide a level of ecological stability within the river’s larger ecosystem. Read more: India’s sharks and rays: An ancient species on the brink of extinction. The genus Carcharhinus (Carcharhinidae). The Ganges shark is a requiem shark species that is found in Indian rivers Ganga and Brahmaputra. D'Aubrey and N. Kistnasamy, 1973. Because this species is part of the Carcharhinidae family of sharks, they are “requiem species” characterised as migratory, live-bearing sharks that live in warm waters, much like the more common tiger shark and grey reef shark. Lineaweaver and Backus (1970) and Ellis (1975, 1983) even considered the Ganges shark a synonym of Carcharhinus leucas, although Garrick (1982) recognized it as distinct.During a trip to India in 1982 the writer discovered an additional specimen of G. gangeticus in the fish collection of the Zoological Survey of India in Calcutta (ZSI 8067, 61 cm newborn female, misidentified as Carcharhinus temmincki), collected by Dr J. Anderson from the Hooghly River on 4 April 1867. One female specimen was recorded at Sassoon Docks in Mumbai, India in February 2016, measuring 266 cm total length. The Ganges shark is potentially dangerous because of its size and large teeth, but at present its relation to humans is a mystery, along with almost all other aspects of its biology. The Ganges shark is a river shark believed to inhabit the Ganges and Hooghly rivers of West Bengal, India. The Ganges shark remains under-researched and with challenges that prevent deeper study about it. Captiva Fishing Guide Report: Wednesday, December 2: Bull Shark, Catch & Release, Captain Joe’s Charters – the weather is great, no red tide and a lot of good fish have moved back into the gulf, bay, and passes: redfish, snook, seatrout, and sharks are currently present. The size at birth or maturity is unknown for any other Glyphis species. Notes on the fishes of western New Guinea. The specimen found in Mumbai … However, this migration is generally not considered to be for breeding purposes, since newborn individuals have been found in the Hooghly River, suggesting that female sharks actually give birth in freshwater. But with the lack of research, it is uncertain whether the protection of the Ganges shark under the Act has actually had any really impact on the species’ overall population size. Accessed 2020. It is also one of the most heavily polluted water systems in the world and is regularly inundated with raw sewage, litter and industrial waste. Some teeth, due to predation activity, are chipped but this jaws is very good with Large Teeth. Gilbert, J.A.F. Carcharhinus leucas (Müller and Henle, 1839) or Zambezi shark, not to be confused with the bull shark (Carcharias taurus) because the "bull shark nomenclature" Boeseman (1964) noted that "most of the recorded C. gyngeticus from outside the Indo-Pakistan Peninsula (excepting those from Japan and possibly, from Viti-Levu, Fiji Islands), are identical with C. leucas Müller and Henle. Garrick, J.A.F., 1982. Mysterious Species of Ganges Shark Is Seen for First the in a Decade. 3, no. NOAA Tech.Rep.NMFS Circ., (445):194 p. Budker, P. and P. Whitehead, 1971. Although their feeding habits are largely unknown, it is presumed, from their backward tilted eyes and slender teeth, that the species trawls for small marine fish and stingrays along the bottom of the river. Additionally, the relatively narrow habitat range of the species makes it even more susceptible. Although sharks are currently caught in the Ganges system (P.K. You can continue searching for Glyphis gangeticus on one of these Web sites: Fauna Europaea (animals) | IOPI (plants) | NCBI (genetic). The only true river shark in the world, this species is Critically Endangered (IUCN Red List) and largely known from museum specimens collected during the 19th century from the lower reaches of the Ganges … They are a critically endangered species. It is often confused with the bull shark, which is known to attack humans. Fossil shark teeth are often fairly common in the fossil record because sharks constantly replace their work teeth during their lifetime and they preserve well. Invest.Rep.Oceanogr.Res.Inst., Durban, (33):168 p. G. gangeticus2 (habitus drawing)G. gangeticus3 (drawing of head)G. gangeticus4 (drawing of teeth)G. gangeticus6 (distribution map). The eyes are also exceptionally small and tilted, with nictitating eyelids that may be indicative of a physiological adaptation to living in largely turbid rivers with poor visibility. It is also quite uncertain how well the Ganges shark is adapted to fresh water, or for that matter, how well it can live in sea water.
Garrick, J.A.F., 1982. But recently … It is also possible that a reduction in apex predator numbers could lead to an explosion in mesopredator populations, resulting in the possible extinction of local prey species. Talwar, pers. The size of an adult ranges from 57-78 cm and weighs between 5-16 kg. The minute eyes of the Ganges shark, along with other Glyphis sharks, suggests that the entire group may be adapted to turbid water with poor visibility, as in large tropical rivers and muddy estuaries.Type material:Syntypes: A stuffed adult or late adolescent male about 1780 mm long in the Zoologisches Museum, Humboldt Universitat, Berlin apparently lost, and an alcohol-preserved specimen in the Museum National d'Histoire Naturelle, MNHN 1144, 564 mm long. Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species. Sharks of the genus Carcharhinus. It inhabits the River Hooghly in West Bengal, as well as the rivers Ganges, Brahmaputra, and the Mahanadi.It is amongst the 20 most threatened shark species and is listed as a Critically Endangered species in the IUCN Redlist. Most sharks in this family have pointed noses – in fact Carcharhinus means sharp nosed. Read more: Bathing in Ganga during Kumbh may wash away sins, but what about diseases? This species is a stocky shark with a snout that is broadly rounded and much shorter than the width of its mouth. The Bull Shark is similar in size at 2.4 m (7.9 ft). The fishes of the groups Elasmobranchii, Holocephali, Isospondyli, and Ostariophysi obtained by US Bureau of Fishing Steamer ALBATROSS. A guide to the kinds of potentially dangerous sharks. It has a whole series of different names that all refer to its geographical location such as the Zambezi, Nicaragua or Ganges River Shark. The Bull Shark is everywhere you wouldn’t expect it! This is also incredibly unlikely given the species low population numbers. Reaching up to 178 cm in length, the Ganges shark is typically characterised by a uniform grey or brown color and has no distinguishing markings of any kind. A 178-cm specimen of Ganges Shark was apparently mature and late fetuses or newborn specimens are 56 to 61 cm long. The blacktip sharkgets its name from its distinctive black markings on the tips of its fins.
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