Barnacle shark
| Barnacle shark | ||||||||||||
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Barnacle shark ( Carcharhinus dussumieri ) |
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| Carcharhinus dussumieri | ||||||||||||
| ( Müller & Henle , 1839) |
The barnacle shark ( Carcharhinus dussumieri ) is a species of the genus Carcharhinus within the Requiem sharks (Carcharhinidae). The species occurs in the Asian coastal waters from the Persian Gulf over India to China , Japan and probably to the Philippines .
Appearance and characteristics
The barnacle shark is a small and fairly slender shark with a maximum length of about 100 centimeters and an average body length between 70 and 90 centimeters. He has a gray to brown back color and a white belly. The fin tips of the second dorsal fin are black or at least very dark, and there may be a light stripe along the sides of the body.
It has an anal fin and two dorsal fins . The first dorsal fin is small and triangular, it begins above the rear half of the free ends of the pectoral fins. The second dorsal fin is relatively large and well developed at around 2.5 to 4.0% of the body length; it begins at about the same height as the anal fin. An interdorsal ridge is present. The pectoral fins are relatively small and sickle-shaped. The snout is elongated and rounded, the eyes are comparatively large and horizontally oval. Like all species of the genus, the animals have five gill slits and no injection hole .
There is a particular risk of confusion with the black spot shark ( C. sealei ); features of the teeth or other diagnostic differences must be used for a clear identification.
Way of life
The barnacle shark is a shallow water species that occurs primarily in the area of the continental shelf to depths of 170 meters. He often stays close to the ground and rarely in open water. It predatory feeds mainly on small bony fish , crustaceans and octopus .
The sharks are viviparous and form a yolk sac placenta ( placental viviparous ). The birth length of the young is about 38 cm. The young sharks reach sexual maturity with a body length of about 65 to 70 (males) or 70 to 75 centimeters (females).
distribution
The barnacle shark is common in the Asian coastal waters from the Persian Gulf via India to China , Japan and probably the Philippines .
Danger
The barnacle shark is harmless to humans. It is listed in the IUCN Red List as a type of early warning list ("Near Threatened"). Here, however, its distribution area is mainly extended to the north coast of Australia, a summary is to be assumed with the black-spotted shark ( C. sealei ), which is regarded as a separate species and which has its distribution focus here.
supporting documents
- ↑ Carcharhinus dussumieri in the endangered Red List species the IUCN 2007. Posted by: Bennett, MB & Kyne, PM (SSG Australia & Oceania Regional Workshop, March 2003), 2003. Accessed on 17 August, 2008.
literature
- Kuno Sch. Steuben : The sharks of the seven seas: species, way of life and sporting catch. Parey, Berlin 1989; Pages 85 and 98. ISBN 3-490-44314-4
Web links
- Species portrait on hai.ch
- Barnacle shark on Fishbase.org (English)