Long-nosed velvet thorn shark
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Long-nosed velvet thorn shark ( Centroscymnus crepidater ) |
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| ( Barbosa du Bocage & de Brito Capello , 1864) |
The long-nosed velvet thorn shark ( Centroscymnus crepidater , Syn . : Centroselachus crepidater ) is a species of shark from the sleeping shark family .
features
The black or dark brown to gold-colored long-nosed velvet thorn shark reaches a length of 90 to 105 cm, Fishbase states the maximum total length ( TL ) is 130 cm. It is a very slim species, the body shape of which does not suddenly and sharply taper from the chest region. The tip of its long snout, which is narrowed at the nostrils, is rounded, the spray hole is located slightly above the eye. The upper teeth are lanceolate, the lower blade-like with moderately high, fairly broad roots and moderately long, sloping tips. The first four gill slits are about the same length, the fifth is significantly longer.
The two dorsal fins (dorsals) are roughly similar in shape and size. The spines are very small, but their tips protrude beyond the dorsal fins. The pectoral fins (pectorals) are twice as long as they are wide, there is no pronounced inner corner. The pelvic fins (ventral) begin below the beginning of the second dorsal fin and do not extend beyond the tip of the second dorsal fin. The caudal fin is wide and cut off at the tip, the lower fin lobe is moderately developed. There is no anal fin (anal).
distribution and habitat
The distribution area of the long-nosed velvet thorn shark extends over the eastern Atlantic from Iceland to Namibia . There are also occurrences in the western Pacific ( New South Wales , Australia and New Zealand ), in the southeastern Pacific (northern Chile ), as well as in the Indian Ocean ( Aldabra and Malabar coast ).
Long-nosed velvet thorn sharks live on continental and island slopes, at or near the bottom, at a depth of 230 to 1500 meters. Off Australia, the species is most common at depths of 780 to 1,100 meters.
Way of life
The sexual maturity reach male Long-nosed Samtdornhaie with 64 to 68 cm, with 82 cm female. The reproduction rate of the 15 (males) and 22 (females) year old animals seems low. This ovoviviparous species has 4–8 young per litter , they are 28 to 35 cm tall. Long-nosed velvet thorn sharks feed primarily on fish such as lanternfish and cephalopods . Long-nosed velvet thorn sharks can live around 60 years.
use
The species is caught in bottom trawls in the eastern Atlantic, where it is used for fish meal. Its meat and oil ( squalene ) are used as bycatch in net and line fishing. However, the meat is heavily contaminated with mercury .
Individual evidence
- ↑ a b c d Longnose velvet dogfish ( Centroscymmus crepidater ) at Marine Species Identification Portal.
- ↑ a b c d e IUCN
- ↑ a b c d e f g Leonard JV Compagno : FAO Species Catalog. Vol. 4. Sharks of the world. An annotated and illustrated catalog of shark species known to date. Part 1 - Hexanchiformes to Lamniformes. 1984 ( FAO Corporate Document Repository , Article Online ( 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. , P. 56)
- ↑ a b c d e f Fishbase
Web links
- Long-nosed velvet thorn on Fishbase.org (English)
- Centroselachus crepidater inthe IUCN 2013 Red List of Threatened Species . Posted by: Stevens, J. (SSG Australia & Oceania Regional Workshop, March 2003), 2003. Retrieved January 15, 2014.
- Centroscymnus crepidater ( Barbosa du Bocage & de Brito Capello , 1864) at World Register of Marine Species (WoRMS)