Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 50449). Diet poorly known, but stomachs examined contained fishes and cephalopods. Caught by demersal fisheries operating in deepwater areas. Utilized for its meat, fins (low value) and liver oil (very high value)(Ref.58048).
  • Compagno, L.J.V. and V.H. Niem 1998 Squalidae. Dogfish sharks. p. 1213-1232. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 31367)
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Distribution

Range Description

Known from the Indian Ocean (Maldive Islands, possibly Sri Lanka), South China Sea and Western Central Pacific Ocean (Philippines).
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Western North Pacific.
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Northwest Pacific: Xisha (Paracel) Islands and off the Zujiang River mouth, Hong Kong. A similar and perhaps identical species occurs off Maldives, Sri Lanka, and the Philippines.
  • Compagno, L.J.V. and V.H. Niem 1998 Squalidae. Dogfish sharks. p. 1213-1232. In K.E. Carpenter and V.H. Niem (eds.) FAO Identification Guide for Fishery Purposes. The Living Marine Resources of the Western Central Pacific. FAO, Rome. (Ref. 31367)
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Physical Description

Size

Max. size

108 cm TL (male/unsexed; (Ref. 58048))
  • White, W.T., P.R. Last, J.D. Stevens, G.K. Yearsley, Fahmi and Dharmadi 2006 Economically important sharks and rays of Indonesia. [Hiu dan pari yang bernilai ekonomis penting di Indonesia]. Australian Centre for International Agricultural Research, Canberra, Australia. (Ref. 58048)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Inhabits upper continental and insular slopes, recorded depths: 760 to 770 m (Compagno in preparation a). Centrophorus spp. usually occur on or near the bottom over the continental slope from about 200 to 2,300 m depth.

Reported size ranges from 35.2 to 93 cm total length (TL). Size and age at maturity is unknown. Smallest reported adult male is 75 cm TL; smallest reported adult female is 78 cm TL (Compagno in preparation a). All other aspects of biology unknown.

Reproduction in Centrophorus is ovoviviparous, and fecundity is low. C. uyato and C. moluccensis (which superficially resemble C. isodon) only have 1 to 2 embryos per litter, compared to 5 to 7 per litter in C. squamosus and C. lusitanicus respectively.

Diet includes a wide range of teleosts, other dogfishes, cephalopods, shrimps and occasionally salps.

Systems
  • Marine
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Environment

bathydemersal; marine; depth range 760 - 770 m (Ref. 47737)
  • Compagno, L.J.V., P.R. Last, J.D. Stevens and M.N.R. Alava 2005 Checklist of Philippine Chondrichthyes. CSIRO Marine Laboratories, Rept. 243. 101 pp. (Ref. 47737)
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Life History and Behavior

Life Cycle

Ovoviviparous, embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace (Ref. 205). Gives birth to litters of 2 pups after an unknown gestation period; no apparent reproductive synchronicity. Largest embryo recorded was 32 cm TL (Ref.58048).
  • Dulvy, N.K. and J.D. Reynolds 1997 Evolutionary transitions among egg-laying, live-bearing and maternal inputs in sharks and rays. Proc. R. Soc. Lond., Ser. B: Biol. Sci. 264:1309-1315. (Ref. 50449)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Centrophorus isodon

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 3
Species With Barcodes: 1
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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
2004

Assessor/s
Duffy, C. (Deepsea Chondrichthyan Workshop, November 2003)

Reviewer/s
Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
A rare, little-known deepwater dogfish with sporadic records in the Indian and Pacific Oceans. May be more wide-ranging than the records suggest. Inhabits upper continental and insular slopes and has been recorded at depths of 760 to 770 m. Maximum reported size 93 cm total length (TL). Nothing known of its biology, but related species generally have very low fecundity. Other members of the genus exhibit little resilience to fishing pressure and have been rapidly depleted by directed commercial fisheries, and as bycatch. Further research and monitoring of deepsea fisheries as they expand globally is necessary. Insufficient information is available to assess this species beyond Data Deficient at this time.
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Population

Population
Population unknown.

Population Trend
Unknown
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Threats

Major Threats
Probably taken as bycatch in deepwater trawl and line fisheries. Other members of the genus exhibit little resilience to fishing pressure and have been rapidly depleted by directed commercial fisheries, and as bycatch (Cavanagh et al. 2003). Further research and monitoring of deepsea fisheries as they expand globally is necessary.

Utilisation unknown. Probably utilized for liver oil and possibly fish meal.
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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
No conservation measures are in place for this species.
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Wikipedia

Blackfin gulper shark

The blackfin gulper shark, Centrophorus isodon, is a dogfish of the family Centrophoridae in the Northwest Pacific.[1]

References[edit]

  1. ^ Froese, Rainer and Pauly, Daniel, eds. (2006). "Centrophorus isodon" in FishBase. May 2006 version.
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