Overview
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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Somalia
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Anon. (1996). FishBase 96 [CD-ROM]. ICLARM: Los Baños, Philippines. 1 cd-rom pp.
http://www.marinespecies.org/aphia.php?p=sourcedetails&id=5909
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Anon. (2000). FishBase 2000 [CD-ROM]. ICLARM: Los Baños, Laguna, Philippines. 4 cd-roms pp.
http://www.marinespecies.org/aphia.php?p=sourcedetails&id=6542
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Compagno, L.J.V. (1984). FAO Species Catalogue No. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 1. Hexanchiformes to Lamniformes. FAO Fish. Synop. (125) Vol 4, Part 1. 246 pp. FAO, Rome.
http://www.marinespecies.org/aphia.php?p=sourcedetails&id=5947
© WoRMS for SMEBD
Source:
World Register of Marine Species
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Western Indian Ocean: Somalia and Gulf of Aden.
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Physical Description
Size
Diagnostic Description
Description
Found on the continental and insular shelves. Development uncertain. Not utilized at present.
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Anon. (1996). FishBase 96 [CD-ROM]. ICLARM: Los Baños, Philippines. 1 cd-rom pp.
http://www.marinespecies.org/aphia.php?p=sourcedetails&id=5909
© WoRMS for SMEBD
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World Register of Marine Species
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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
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.
© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
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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
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.
© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
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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
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.
© Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
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Ecology
Habitat
Habitat and Ecology
Habitat and Ecology
Systems
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.
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).
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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Trends
Population
Population
Population Trend
No information available.
Population Trend
Unknown
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IUCN
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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.
This species may also be affected by habitat degradation on the continental shelf, as a result of agriculture, coastal development and pollution.
© International Union for Conservation of Nature and Natural Resources
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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
 | This article needs additional citations for verification. (October 2011) |
The speckled catshark, Halaelurus boesemani, is a cat shark of the family Scyliorhinidae, found in the Gulf of Aden and off Somalia, also known around Viet Nam, 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
References
- ^ 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. http://www.iucnredlist.org/apps/redlist/details/161488. Retrieved February 9, 2010.
- Froese, Rainer, and Daniel Pauly, eds. (2006). "Halaelurus boesemani" in FishBase. July 2006 version.
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