Echinorhinus cookei
| Echinorhinus cookei | ||||||||||||
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Drawing of a barbed shark |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Echinorhinus cookei | ||||||||||||
| Pietschmann , 1928 |
Echinorhinus cookei , in German as Stachelhai called, is one of two species from the family of Echinorhinidae .
features
Echinorhinus cookei is a large shark (average size approx. Three meters, maximum size approx. Four meters) with two dorsal fins offset towards the tail and without a fin spine. The barbed shark got its name because of the flat, thorn-like skin denticles found on the body and fins. The second dorsal fin begins slightly before the end of the pelvic fins, the anal fin is missing. The head is flattened with small suction holes . The fifth cleft gill is significantly larger than the other four. The body has a predominantly brown color.
The teeth arranged in rows (20–24 in the upper jaw and 18–22 in the lower jaw ) can have up to three secondary peaks.
Way of life
Relatively little is known about the way of life of this shark, as it has only been caught relatively rarely and has never been observed for longer.
Echinorhinus cookei probably lives on the bottom or in the deep open water ( mesopelagial ) of the deep sea ( bathyal ), usually at a depth of around 420 meters. Occasionally, however, it has also been caught near the surface of the water. As far as is known, its diet consists mainly of deep-sea bony fish , other small sharks (e.g. dogfish ) and octopus .
Like most cartilaginous fish , the species is ovoviviparous , so the embryos develop in the womb and are then born alive. The number of young animals per litter is 15 to 20.
The birth size is around 45 centimeters. The sexual maturity is reached at females with about 250 centimeters body length over the maturity of the males are not yet known before.
distribution
The species is known from the Pacific ( Taiwan , New Zealand , Palau , Hawaii , California and Peru ).
Individual evidence
- ^ Pietschmann, V. 1928: New fish species from the Pacific Ocean. Anzeiger der Akademie der Wissenschaften in Wien 65 (27): 297–298
- ↑ GARRICK, JAF (1960): Studies on New Zealand Elasmobranchii. Part X. The genus Echinorhinus, with an account of a Second species, E. cookie Pietschmann, 1928, from the New Zealand waters. Transactions of the Royal Society of New Zealand, 88 (1): 105-117
literature
- COMPAGNO, LJV (1984): FAO Species Catalog. Vol 4: Sharks of the world, Part 1 - Hexanchiformes to Lamniformes. FAO Fisheries Synopsis No. 125, 4 (1): 1-250
- GARRICK, JAF (1960): Studies on New Zealand Elasmobranchii. Part X. The genus Echinorhinus, with an account of a Second species, E. cookie Pietschmann, 1928, from the New Zealand waters. Transactions of the Royal Society of New Zealand, 88 (1): 105-117.
- PFEIL, Friedrich H. (1983): Dental morphological investigations on recent and fossil sharks of the orders Chlamydoselachiformes and Echinorhiniformes. 315 pages, 146 illustrations, ISBN 978-3-923871-00-1
Web links
- Echinorhinus cookei on Fishbase.org (English)
- Portrait of the Shark Foundation
- www.shark-references.com: References to Echinorhinus cookei
- Echinorhinus cookei onthe IUCN 2013 Red List of Threatened Species . Posted by: Paul, L. (SSG Australia & Oceania Regional Workshop, March 2003), 2003. Retrieved December 5, 2013.