Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 205).
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Distribution

Range Description

Recorded from localised records off northwestern Western Australia and from the Arafura Sea, Indonesia.
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Arafua Sea, Timor Sea and off western Australia.
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Eastern Indian Ocean: Western Australia and Arafura Sea.
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Physical Description

Morphology

Vertebrae: 76 - 82
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Size

Max. size

26.2 cm TL (male/unsexed; (Ref. 45056)); 29.7 cm TL (female)
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Diagnostic Description

Body slender. Dorsal and ventral coloration strongly contrasted; dots and dashes absent on upper half; dark ventral saddle on posterior third of caudal peduncle; prominent dark bands at the tip and through mid caudal fin. Eyes rather narrow; upper eyelid with pale naked patch. Caudal peduncle elongate (18.9-21.8% TL). Denticles extremely dense, very thin, delicate, arranged in poorly defined longitudinal rows. Flank marking base under or slightly forward of second dorsal spine; its posterior branch barely reaching free rear tip of second dorsal fin; central caudal marking absent; finger of caudal base marking very long, more than 7% TL. Monospondylous centra 37-38 (Ref. 45056).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Recorded from the continental slope in 430 to 550 m. Maximum size at least 30 cm total length (TL). A male of 26.2 cm TL was mature. Nothing else known of its biology.

Systems
  • Marine
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Environment

bathypelagic; marine; depth range 430 - 550 m (Ref. 45056)
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Depth range based on 3 specimens in 1 taxon.
Water temperature and chemistry ranges based on 3 samples.

Environmental ranges
  Depth range (m): 545 - 550.5
  Temperature range (°C): 7.316 - 8.353
  Nitrate (umol/L): 21.837 - 32.717
  Salinity (PPS): 34.587 - 34.666
  Oxygen (ml/l): 2.199 - 2.818
  Phosphate (umol/l): 1.891 - 2.494
  Silicate (umol/l): 47.785 - 73.996

Graphical representation

Depth range (m): 545 - 550.5

Temperature range (°C): 7.316 - 8.353

Nitrate (umol/L): 21.837 - 32.717

Salinity (PPS): 34.587 - 34.666

Oxygen (ml/l): 2.199 - 2.818

Phosphate (umol/l): 1.891 - 2.494

Silicate (umol/l): 47.785 - 73.996
 
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Trophic Strategy

Found on the continental slope (Ref. 75154).
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Life History and Behavior

Life Cycle

Distinct pairing with embrace (Ref. 205).
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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
2003

Assessor/s
Kyne, P.M. & Cavanagh, R.D. (SSG Australia & Oceania Regional Workshop, March 2003)

Reviewer/s
Seret, B. & Fowler, S. (Shark Red List Authority)

Contributor/s

Justification
A small deepwater lantern shark currently recorded from off northwestern Western Australia and the Arafura Sea (Indonesia) on the continental slope. Although the species is known only from a few small localities and has a narrow bathymetrical range, further exploratory trawls may indicate a wider distribution. Deepwater trawl fisheries are expanding globally, including in Indonesian waters. These activities may place future pressure on this small species. At present Etmopterus evansi is unlikely to be captured frequently as most of the trawl activity is not within its known depth range, and if captured it is likely discarded due to its small size and low commercial value. However, survival rates from trawl discards are likely to be low. There is currently no evidence of a decline in range, habitat quality or number of mature individuals; although any expansion of fishing throughout its range, especially in Indonesian waters should be closely monitored.
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Population

Population
No available information on populations.

Population Trend
Unknown
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Threats

Major Threats
Presently only minor fishing activity in area of occurrence off Western Australia (Commonwealth managed North West Slope Trawl Fishery). The Arafura Sea and Indonesian waters may be subject to some trawling effort by Indonesian vessels (although at present this is mostly in less than 200 m depth). Given the global expansion of deepwater trawl fisheries pressure may be placed upon this species in the future, especially if Indonesian fleets expand into deeper water. Survival rates when discarded from trawl catches will be low.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
There are currently no conservation measures in place for this species.
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Wikipedia

Blackmouth lanternshark

The blackmouth lanternshark, Etmopterus evansi, is a shark of the family Etmopteridae found off Western Australia and the Arafura Sea, at depths between 430 and 550 m. Its length is up to 26 cm.

Reproduction is ovoviviparous.

References[edit]

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