Bornean Shark
| Bornean Shark | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Carcharhinus borneensis | ||||||||||||
| ( Bleeker , 1858) |
The Borneo Shark ( Carcharhinus borneensis ) is a species of the genus Carcharhinus within the Requiem Sharks (Carcharhinidae). The species is found in the waters of Southeast Asia south of China , around Borneo and probably also around the Philippines and Java . After this shark was only known to five individuals caught between 1858 and 1937, a research team from Universiti Malaysia Sabah succeeded in rediscovering it in 2007.
Appearance and characteristics
The Bornean Shark is a small and fairly slender shark with a likely maximum length of about 100 centimeters. The longest scientifically recorded specimen to date was only 70 centimeters long. His back is brown and his belly is white. The fin tips of the first dorsal fin and the caudal fin are dark, while the pectoral and pelvic fins and the anal fins have a white border.
It has an anal fin and two dorsal fins . The first dorsal fin is large and rounded, it begins above or slightly behind the posterior base of the pectoral fins. The second dorsal fin is relatively low. There is no interdorsal ridge . The pectoral fins are relatively small and sickle-shaped. The snout is elongated and pointed, and around the corners of the mouth there are noticeably large pore openings. Like all species of the genus, the animals have five gill slits and no injection hole .
Way of life
The lifestyle of the Borneo Shark is largely unknown. It is believed that it occurs mainly near the coast. Nutrition and reproduction have not been studied either, but both are likely to occur as with other Carcharhinus species.
distribution
The Borneo shark is common in the marine areas of the Indo-Pacific Southeast Asia south of China , around Borneo and probably also around the Philippines and Java .
Danger
The Bornean Shark is harmless to humans. It is listed in the IUCN Red List as “Endangered”. Before 2007 the species was only occupied by five individuals, four of which come from the Borneo area and one from the coastal region of China. After no specimens of this shark had been caught since 1937, Dr. Saleem Mustafa from Universiti Malaysia Sabah in 2007 that the species still exists. Investigations in fish markets in Borneo and in collections in various countries in Southeast Asia led the IUCN to suspect in 2000 that this shark was threatened with extinction or was already extinct.
supporting documents
- ↑ UMS team finds rare shark ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ Bornean Shark on Fishbase.org (English)
- ↑ Carcharhinus borneensis in the Red List of Threatened Species of the IUCN 2007. Posted by: Compagno, Hunting Association, 2000. Retrieved on 16 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
- Bornean Shark on Fishbase.org (English)