Overview

Comprehensive Description

Biology

An little-known inshore tropical shark found in coastal waters (Ref. 13563). Ovoviviparous (Ref. 50449).
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Distribution

Range Description

This species occurs ion the Northwest Pacific: Philippine Islands (Dumaguete, Negros, also Bagac Bay, Bataan Prov., Luzon). It is found inshore down to 48 m.
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Western Central Pacific: known only from the Philippines.
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Philippines.
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0
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Size

Max. size

96 cm TL (female)
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Diagnostic Description

No dusky bar on underside of snout; young with dark bars on caudal fin but not elsewhere (Ref. 13563).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Most details of ecology and life history parameters are unknown, for this species is only known from two free-swimming individuals reported. The only gravid female reported was 96 cm total length (TL) and had 12 foetuses. Size at birth at least 20?22 cm (term foetuses).

Systems
  • Marine
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Environment

demersal; marine; depth range ? - 48 m (Ref. 244)
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Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 374 - 374
 
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Depth: 0 - 48m.
Recorded at 48 meters.

Habitat: demersal. An inshore tropical shark. Live-bearing, with 12 young in a litter. However, it is not known if a yolk-placenta is formed. Size at birth at least 20 to 22 cm (term fetuses).
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Life History and Behavior

Life Cycle

Ovoviviparous, embryos feed solely on yolk (Ref. 50449). 12 young in a litter and size at birth at least 20 to 22 cm (Ref. 244).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Hemitriakis leucoperiptera

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

Conservation Status

IUCN Red List Assessment


Red List Category
EN
Endangered

Red List Criteria
B1ab(iii,v); C2a(ii)

Version
3.1

Year Assessed
2006

Assessor/s
Compagno, L.J.V.

Reviewer/s
Musick, J.A. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
This assessment is based on the information published in the 2005 shark status survey (Fowler et al. 2005).

The Whitefin Topeshark (Hemitriakis leucoperiptera) is a little-known inshore tropical shark found only in heavily fished and environmentally degraded Philippine coastal waters. Only two free-living specimens are known from an extremely restricted range. There are no confirmed records over the last 50 or more years, although a small number of Hemitriakis specimens have recently been collected under the auspices of the WWF Philippines chondrichthyan biodiversity programme. Their taxonomic status is currently being investigated.

History
  • 2000
    Endangered
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Population

Population Trend
Unknown
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Threats

Major Threats
The species is probably taken as utilized bycatch by local fisheries in the Philippines. The holotype was taken in a fish trap. No statistics are available for fisheries catches ? there have been no confirmed records of this species for over 50 years. However, past and continuing population reduction is probable, due to the heavy inshore fishing occurring throughout its limited area of distribution. It may also be suffering from habitat loss and deterioration, for dynamite and cyanide fishing have affected much of the reef habitat in its area. A further complication is that there are apparently two Philippine Hemitriakis that have been confused under this species, but they differ in vertebral counts, colouration and possibly morphometrics (Compagno 1970, 1984b, 1988, in prep. b).
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Endangered (EN) (B1ab(iii,v); C2a(ii))
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Management

Conservation Actions

Conservation Actions
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: subsistence fisheries
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Wikipedia

Whitefin topeshark

The whitefin topeshark, Hemitriakis leucoperiptera, is a houndshark of the family Triakidae, found only in the tropical waters of the Philippines between latitudes 20° N and 5° N. They inhabit the coastal areas. They can grow up to a length of 96 cm. Adolescent specimens have dark areas on the caudal fin. The reproduction of this shark is ovoviviparous.

References[edit]

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