Overview

Comprehensive Description

Biology

Caught by trammel nets (Ref. 76802).
  • Baranes, A. 2003 Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65. (Ref. 76802)
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Distribution

Range Description

Western Indian Ocean: known only from the holotype and paratype collected off Alphonse Island, Republic of Seychelles (Baranes 2003).
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Seychelles.
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Western Indian Ocean: Seychelles.
  • Baranes, A. 2003 Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65. (Ref. 76802)
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Physical Description

Size

Max. size

79.7 cm TL (male/unsexed; (Ref. 76802)); 65.2 cm TL (female)
  • Baranes, A. 2003 Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65. (Ref. 76802)
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Diagnostic Description

This species is distinguished by having large tip of snout to first dorsal distance of 34% TL; first dorsal fin high (7 % TL); second dorsal fin base long (9.8% TL); long snout (12.2% TL); uniformly grey with tip and the trailing edge of dorsal fins blackish (Ref. 76802).
  • Baranes, A. 2003 Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65. (Ref. 76802)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The holotype (female; 65.2 cm TL) and paratype (male; 79.7 cm TL) were collected by trammel net at 1,000 m depth off Alphonse Island (Baranes 2003). Appears to display sexual dimorphism in snout length and shape of the upper jaw teeth (Baranes 2003). Little else is known of the biology of the species.

Systems
  • Marine
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Environment

bathydemersal; marine; depth range ? - 1000 m (Ref. 76802)
  • Baranes, A. 2003 Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65. (Ref. 76802)
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
McCormack, C.

Reviewer/s
Baranes, A., Valenti, S.V., Gibson, C. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
The Seychelles Gulper Shark (Centrophorus seychellorum) is a recently described deep water shark known only from the holotype (female; 65.2 cm TL) and paratype (male; 79.7 cm TL) collected during a research cruise by trammel net at 1,000 m off Alphonse Island, Republic of Seychelles in the western Indian Ocean. The full depth distribution of the species is unknown but it is possible that the Seychelles Gulper Shark has already been caught by Seychellois fishermen. Given the species’ apparently narrow range, the limited life history characteristics and vulnerability of Centrophorus species to rapid population depletion in fisheries, any bycatch may be of concern. However, insufficient information is available to assess this species beyond Data Deficient at this time. Further information is required on the species' biology, distribution and importance to fisheries and reassessment should be undertaken as soon as this becomes available.
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Population

Population
This species is known only from the holotype and paratype. May be endemic to the region but population size is unknown.

Population Trend
Unknown
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Threats

Major Threats
The depth distribution of the species is little known and it is highly probable that C. seychellorum has been caught by Seychellois fishermen without their knowledge that it was a new species (Anon 2005). Given the species’ apparently narrow range, the limited life history characteristics of Centrophorus species and the vulnerability of other Centrophorus species to rapid population depletion in fisheries, any bycatch is of concern. (For example, intensive trawl fishing on the slope off New South Wales, Australia, rapidly depleted stocks of similar species there (Graham et al. 2001)). Although some trial deepsea fishing has been conducted in the Seychelles to date, there are apparently no commercial fisheries targeting resources below 600 m at present (M. Isidore pers. comm. 2007).
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Data deficient (DD)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
None in place. Like many deeper water species more information on biology, ecology and importance in fisheries are required to further assess status and any future conservation needs. Where taken, catches require monitoring, particularly as deepwater fisheries expand worldwide. A new shark monitoring log-sheet was introduced by the Seychelles Fishing Authority in August 2004 aimed at assessing the stocks of sharks fished locally and identifying the various species caught (Anon 2005).

The development and implementation of management plans (national and/or regional e.g., under the FAO International Plan of Action for the Conservation and Management of Sharks: IPOA-Sharks) are required to facilitate the conservation and management of all chondrichthyan species in the region.
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Wikipedia

Seychelles gulper shark

Centrophorus seychellorum or Seychelles gulper shark is a species of fish in the Centrophoridae family[1] found in Alphonse island in Seychelles. This species is distinguished by having large tip of snout to first dorsal distance of 34% TL; first dorsal fin high (7 % TL); second dorsal fin base long (9.8% TL); long snout (12.2% TL); uniformly grey with tip and the trailing edge of dorsal fins blackish. [2]

See also[edit]

List of sharks

References[edit]

  1. ^ "Centrophorus seychellorum". IUCN. Retrieved 11 May 2014. 
  2. ^ Baranes, A., 2003. Sharks from the Amirantes Islands, Seychelles, with a description of two new species of squaloids from the deep sea. Israel J. Zool. 49:33-65.


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