Overview

Comprehensive Description

Halaelurus boesemani ZBK :

USNM 205136 ( holotype ), adult male 430 mm TL, off Somalia , 11°37' N , 51°27' E .

  • William T. White, Peter R. Last, John D. Stevens (2007): Halaelurus maculosus n. sp. and H. sellus n. sp., two new species of catshark (Carcharhiniformes: Scyliorhinidae) from the Indo-West Pacific. Zootaxa 1639, 1-21: 2-2, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:84152FF4-E49B-4049-A9FC-E558F585D210
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Distribution

Range Description

Western Indian Ocean: Horn of Africa, Gulf of Aden, Somalia (Compagno 1984). Its restricted known distribution suggests extent of occurrence is less than 20,000 km², although the area is relatively poorly sampled.
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Western Indian Ocean: Somalia and Gulf of Aden.
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Physical Description

Size

Maximum size: 480 mm TL
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Diagnostic Description

Description

Found on the continental and insular shelves. Development uncertain. Not utilized at present.
  • Anon. (1996). FishBase 96 [CD-ROM]. ICLARM: Los Baños, Philippines. 1 cd-rom pp.
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USNM 205136 ( holotype ), adult male 430 mm TL, off Somalia , 11°37' N , 51°27' E .

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Type Information

Paratype for Halaelurus boesemani Springer & D'Aubrey
Catalog Number: USNM 221424
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): S. Applegate
Year Collected: 1964
Locality: Off Somali Coast, Somalia, Indian
Depth (m): 60 to 70
Vessel: Anton Bruun
  • Paratype: Springer, S. & D'Aubrey, J. D. 1972. Oceanographic Research Institution Investigation Report, Durban. No. 29: 11, figs. 1d, 2; tables 1-3.
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Holotype for Halaelurus boesemani Springer & D'Aubrey
Catalog Number: USNM 205136
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1964
Locality: Somalia, Indian
Depth (m): 67 to 72
Vessel: Anton Bruun
  • Holotype: Springer, S. & D'Aubrey, J. D. 1972. Oceanographic Research Institution Investigation Report, Durban. No. 29: 11, figs. 1d, 2; tables 1-3.
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Paratype for Halaelurus boesemani Springer & D'Aubrey
Catalog Number: USNM 201763
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1964
Locality: Somalia, Indian
Depth (m): 67 to 72
Vessel: Anton Bruun
  • Paratype: Springer, S. & D'Aubrey, J. D. 1972. Oceanographic Research Institution Investigation Report, Durban. No. 29: 11, figs. 1d, 2; tables 1-3.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
A largely unknown catshark, living on continental and insular shelves at depths of 37?91 m (Compagno 1984). This species is born at greater than 7 cm, and reaches a maximum size of 48 cm total length (TL), with male adults ranging from 42?48 cm TL and female adults ranging from 43?47 cm TL (Compagno 1984). The biology of this species remains largely unknown.

Systems
  • Marine
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Depth range based on 29 specimens in 1 taxon.
Water temperature and chemistry ranges based on 19 samples.

Environmental ranges
  Depth range (m): 29 - 217.5
  Temperature range (°C): 15.348 - 27.572
  Nitrate (umol/L): 1.728 - 21.401
  Salinity (PPS): 34.580 - 35.456
  Oxygen (ml/l): 2.157 - 4.021
  Phosphate (umol/l): 0.300 - 1.621
  Silicate (umol/l): 5.705 - 28.637

Graphical representation

Depth range (m): 29 - 217.5

Temperature range (°C): 15.348 - 27.572

Nitrate (umol/L): 1.728 - 21.401

Salinity (PPS): 34.580 - 35.456

Oxygen (ml/l): 2.157 - 4.021

Phosphate (umol/l): 0.300 - 1.621

Silicate (umol/l): 5.705 - 28.637
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth: 37 - 250m.
From 37 to 250 meters.

Habitat: demersal. Found on the continental and insular shelves. Development uncertain. Males mature at about 35 cm (Ref. 6871).
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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
White, W.T., Compagno, L.J.V. & Henderson, A.

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

Contributor/s

Justification
The Speckled Catshark (Halaelurus boesemani) is a relatively small, poorly known catshark. Previously considered to be much wider ranging, but two new Halaelurus species recently described from Indonesia/Philippines and northwest Australia have reduced its distribution. This species is now known only from nine specimens collected in three localities, relatively close to each other, on the Horn of Africa, Somalia, although the area is relatively poorly sampled. It occurs on continental and insular shelves at depths of 37?91 m, and reaches 48 cm in length. Its restricted known distribution suggests extent of occurrence is less than 20,000 km², although the area is relatively poorly sampled. Very little specific information is currently available on the fisheries operating within its range, but it may be a bycatch of ?catch all? opportunistic fisheries and demersal trawls. Habitat destruction and pollution may also be a threat to this species? inshore range. At present it is not possible to assess this species beyond Data Deficient due to a lack of information on the fisheries operating within its range and catches.
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Population

Population
No information available.

Population Trend
Unknown
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Threats

Major Threats
This species is small and would be vulnerable to capture in demersal trawl fisheries and some net fisheries. Sharks are reported to play an important role in both the artisanal and traditional Somali fisheries, although no information is available on the catch species composition and other demersal species are reportedly lightly exploited (FAO 2007). This species is very small and is probably not targeted, although it may be subject to bycatch. Although little specific information is available on artisanal fisheries in Somali waters, small-scale fisheries in nearby countries (such as Oman) tend to be opportunistic, using a variety of net-types to catch as much as possible, and similar practices may be used in Somalia (A. Henderson pers. comm. 2007). Fisheries in Somalia are largely unregulated, with numerous reports of widespread illegal foreign fishing in Somali waters (Young et al. 2006, Somali Fisheries Society 2004). The potential for fisheries to expand and increase in effort is also high; Somalia reportedly intends to accelerate fisheries development (Young et al. 2006).

This species may also be affected by habitat degradation on the continental shelf, as a result of agriculture, coastal development and pollution.
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Management

Conservation Actions

Conservation Actions
None in place. Research is required on life-history, the impact of threats and potential and actual levels of bycatch. Surveys are needed to further define this species? distribution and abundance.
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Wikipedia

Speckled catshark

The speckled catshark, Halaelurus boesemani, is a catshark of the family Scyliorhinidae. It is found in the Gulf of Aden and off the coast of Somalia. It can also be found in the waters around Vietnam, the Philippines, Indonesia, and Western Australia, between latitudes 21° N and 26° S, at depths of between 40 and 250 m. Its length is up to 48 cm.

See also[edit]

References[edit]

  1. ^ W. T. White, L. J. V. Compagno & A. Henderson (2007). "Halaelurus boesemani". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved February 9, 2010. 
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