Graceful shark
| Graceful shark | ||||||||||||
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Graceful shark ( Carcharhinus amblyrhynchoides ) |
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| Scientific name | ||||||||||||
| Carcharhinus amblyrhynchoides | ||||||||||||
| ( Whitley , 1934) |
The graceful shark ( Carcharhinus amblyrhynchoides ) is a species of the genus Carcharhinus within the Requiem sharks (Carcharhinidae). The distribution area of this species extends from the Gulf of Aden and the coasts of India to the island areas of Southeast Asia around Vietnam, the Philippines and Indonesia as well as the north coast of Australia.
Appearance and characteristics
The graceful shark is a medium-sized shark with a maximum length of around 170 centimeters, with an average length of around 130 to 150 centimeters. He has a bronze colored back and a white belly. The tips of the pectoral fins, the two dorsal fins and the upper caudal lobe are black, the latter is also outlined in black. There is a distinct white band on the sides of the body that can fade with age. It can be confused with the blacktip reef shark ( C. melanopterus ) and the gray reef shark ( C. amblyrhynchos ), the former being significantly slimmer and the latter having a black border around the caudal fin. Both species also have a gray and not bronze colored back.
It has an anal fin and two dorsal fins . The first dorsal fin begins at about the same level as the pectoral fins and is triangular. The second dorsal fin is also relatively well developed. There is no interdorsal ridge . The pectoral fins are large and sickle-shaped with rounded or pointed fin ends. The muzzle is short and wide, and the eyes and gills are comparatively large. Like all species of the genus, the animals have five gill slits and no injection hole . The gill slits are very long compared to other species of the genus. The graceful shark is named after the almost uniform teeth in the lower and upper jaw ( isodon = "same tooth "). These are slender and upright.
Way of life
The graceful shark lives close to the coast above the continental shelf , but can also be found in areas remote from the coast to depths of 50 meters. It has a predatory diet , with small bony fish , more rarely octopus and other marine invertebrates belonging to its range of foods. It is harmless to humans.
Like other species of the genus, it is viviparous and forms a yolk sac placenta ( placental viviparous ). The female gives birth to an average of 3 young sharks, they are around 50 to 60 centimeters in size. The sharks reach sexual maturity with a length of 110 to 115 centimeters.
distribution
The range of the graceful shark is limited to the Indian Ocean and the Indo-Pacific . It can be found from the Gulf of Aden and the coasts of India to the island areas of Southeast Asia around Vietnam, the Philippines and Indonesia and the north coast of Australia.
Danger
The graceful shark is classified in the IUCN Red List as a species with a low endangerment risk ("Low Risk"), as it has a fairly large range and is estimated to be comparatively reproductive . Pressure from local fishing is low, although sharks of this species are caught regularly.
supporting documents
- ↑ Carcharhinus amblyrhynchoides in the endangered Red List species the IUCN 2007. Posted by: Simpfendorfer, C., 2000. Retrieved on 25 August, 2008.
Web links
- Species portrait on hai.ch
- Delicate shark on Fishbase.org (English)