Etmopterus sentosus Bass, D'Aubrey and Kistnasamy, 1976 — Details

Thorny Lanternshark learn more about names for this taxon

Overview

Distribution

Range Description

Endemic to southwestern Indian Ocean: east coast of Natal, Mozambique, Madagascar, Kenya and Tanzania. It has been reported as relatively common off Mozambique.
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Western Indian Ocean.
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Physical Description

Size

Maximum size: 270 mm TL
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Diagnostic Description

Description

Length recorded is from an immature specimen; size of adults unknown.
  • Anon. (1996). FishBase 96 [CD-ROM]. ICLARM: Los Baños, Philippines. 1 cd-rom pp.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Inhabits upper continental slope in depths of 200 to 500 m, on or near bottom. Little life history information currently available. Maximum length unknown. Size at birth unknown but a near term fetus reported 5.7 cm. Immature males recorded at 22 to 27 cm and adults at 22 to 27 cm. Immature females recorded at 22 to 26 cm and adult at 25 to 27 cm.

Life history parameters
Age at maturity (years): Unknown.
Size at maturity (total length): Female: 25 to 27 cm; Male: 22 to 27 cm.
Longevity (years): Unknown.
Maximum size (total length): 27 cm or longer.
Size at birth: >5.7 cm.
Average reproductive age (years): Unknown.
Gestation time (months): Unknown.
Reproductive periodicity: Unknown.
Average annual fecundity or litter size: Unknown.
Annual rate of population increase: Unknown.
Natural mortality: Unknown.

Systems
  • Marine
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Depth range based on 8 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 400 - 500
  Temperature range (°C): 9.280 - 11.948
  Nitrate (umol/L): 15.221 - 28.011
  Salinity (PPS): 34.872 - 35.067
  Oxygen (ml/l): 3.100 - 4.372
  Phosphate (umol/l): 1.172 - 2.197
  Silicate (umol/l): 9.148 - 32.596

Graphical representation

Depth range (m): 400 - 500

Temperature range (°C): 9.280 - 11.948

Nitrate (umol/L): 15.221 - 28.011

Salinity (PPS): 34.872 - 35.067

Oxygen (ml/l): 3.100 - 4.372

Phosphate (umol/l): 1.172 - 2.197

Silicate (umol/l): 9.148 - 32.596
 
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Depth: 200 - 500m.
From 200 to 500 meters.

Habitat: bathydemersal. Length recorded is from an immature specimen; size of adults unknown.
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2006

Assessor/s
Burgess, G.H.

Reviewer/s
Cavanagh, R.D., Human, B., Heupel, M.R. & Simpfendorfer, C.A. (Shark Red List Authority)

Contributor/s

Justification
Etmopterus sentosus is a small (27 cm total length), deepwater (200 to 500 m) species endemic to the southwestern Indian Ocean (off the east coast of South Africa, Mozambique, Madagascar, Kenya and Tanzania). Biology is essentially unknown. This species is subject to limited bycatch fishing mortality off South Africa and the situation is assumed to be similar throughout the rest of its range. Thus it is assumed to be of Least Concern at the present time, although like many deepwater chondrichthyan species, more information on biology, ecology and importance in fisheries are required. Any expanding deepwater fisheries in the region need to be carefully monitored and managed.
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Population

Population
No knowledge of population size or structure; limited range suggests single population (no subpopulations).

Population Trend
Unknown
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Threats

Major Threats
Of no importance for fisheries because of its small size. No apparent threats, some deepwater fishing mortality from bycatch but this is known to be limited off South Africa and the situation is assumed to be similar throughout the rest of its range although further study is required.

Utilisation
None known, probably discarded (probably too small to be utilised).
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Management

Conservation Actions

Conservation Actions
None in place. Like many deepwater chondrichthyan species more information on biology, ecology and importance in fisheries are required. Any expanding deepwater fisheries in the region (which could impact its habitat and population) need to be carefully monitored and managed.
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Wikipedia

Thorny lanternshark

The thorny lanternshark, Etmopterus sentosus, is a shark of the family Etmopteridae found in the western Indian Ocean between latitudes and 31°S, at depths between 200 and 500 m. Its length is up to 27 cm.

Reproduction is ovoviviparous.

References

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