Overview

Distribution

Range Description

Western Indian Ocean: recorded from the Gulf of Masira, central Oman (Baldwin 2005).
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Oman.
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Western Indian Ocean: Central Oman.
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Physical Description

Morphology

Vertebrae: 98
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Size

Max. size

56.0 cm TL (male/unsexed; (Ref. 54826)); 61 cm TL (female)
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Diagnostic Description

Diagnosis: Four dark saddles, more or less equally distributed along the head and body. Relatively small, dark pigmented dorsal fins, each with a white distal streak. Large pectoral fins. Unique egg case, with 2 long tendrils extending from its base and flanges with 2 turns. This species differs from H. japonicus in having 4 dark saddles (vs. 11-14); a smaller first-dorsal fin (9.3-10.9% TL vs. 11-21% TL); an egg case of 2 turns (vs. 3), bearing extremely long tendrils (vs. short) (Ref. 54826).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is found on the continental shelf, recorded at 72 m depth. Attains a maximum size of 61 cm total length (TL) (female) (Baldwin 2005).

Systems
  • Marine
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Environment

demersal; marine; depth range ? - 72 m (Ref. 54826)
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Depth range based on 1 specimen in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 72 - 72
  Temperature range (°C): 22.018 - 22.018
  Nitrate (umol/L): 18.637 - 18.637
  Salinity (PPS): 36.042 - 36.042
  Oxygen (ml/l): 1.602 - 1.602
  Phosphate (umol/l): 1.662 - 1.662
  Silicate (umol/l): 10.760 - 10.760
 
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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
Valenti, S.V.

Reviewer/s
Fowler, S.L. & Gibson, C.G. (Shark Red List Authority)

Contributor/s

Justification
The Oman Bullhead Shark (Heterodontus omanensis) is known only from central Oman. It was relatively recently described from three specimens collected at 72 m depth. It is a potential bycatch of demersal fisheries operating within its range, although no specific information is currently available. Insufficient information is available to make an assessment beyond Data Deficient at present and information is required on its biology, abundance and full range, capture in fisheries and population trends.
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Population

Population
Unknown.

Population Trend
Unknown
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Threats

Major Threats
Potential bycatch of demersal trawl fisheries, although no specific information is currently available on catches (Bonfil and Abdallah 2004).
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
None in place. Research is required on this species’ biology, abundance and full range, capture in fisheries and population trends.
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Wikipedia

Oman bullhead shark

The Oman bullhead shark, Heterodontus omanensis, is a bullhead shark of the family Heterodontidae, found in the tropical western Indian Ocean around central Oman from the surface to 72 m on the continental shelf. This shark can reach a maximum length of 61 cm, but on average reaches 56 cm. It is highly possible that the Oman bullhead shark is accidentally caught as by-catch, putting the species at risk. More research is needed to report on the biology and conservation status of this shark.

References[edit source | edit]

  1. ^ S. V. Valenti (2008). "Heterodontus omanensis". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved February 6, 2010. 
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