Overview

Comprehensive Description

Biology

Ovoviviparous (Ref. 205).
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Distribution

Range Description

Currently known only from the central Coral Sea, off the Saumarez and Queensland Plateaus (northeastern Australia).
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Central Coral Sea off the Saumarez and Queensland Plateaus. southwestern Pacific.
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Western Pacific: central Coral Sea, off Saumarez and Queensland Plateau, Australia.
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Physical Description

Size

Max. size

44.8 cm TL (male/unsexed; (Ref. 45056)); 40.3 cm TL (female)
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Diagnostic Description

Body extremely slender. Dorsal and ventral coloration sharply contrasted; fine dark horizontal lines forming series of fine dots and dashes on upper half of body; a dark ventral saddle near middle of caudal peduncle. Head relatively short (usually < 21% TL). Caudal peduncle very elongate (usually > 23% TL). Eyes rather narrow; upper eyelid with pale naked patch. Denticles extremely dense, bristle-like, not arranged in defined rows. Flank-marking base forward of second dorsal-fin spine; its posterior branch longer than anterior branch and extending beyond free rear tip of second dorsal fin; central caudal marking absent. Monospondylous centra 41-45 (Ref. 45056).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Found on or near the bottom of the continental slope in depths of 590 to 700 m. Maximum size at least 45 cm total length (TL). Smallest observed mature male 33.5 cm TL; male adolescent at 33 cm TL. Nothing else known of its biology.

Systems
  • Marine
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Environment

bathypelagic; marine; depth range 590 - 800 m (Ref. 45056)
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Depth range based on 2 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 598 - 797
  Temperature range (°C): 8.650 - 8.650
  Nitrate (umol/L): 23.874 - 23.874
  Salinity (PPS): 34.636 - 34.636
  Oxygen (ml/l): 4.414 - 4.414
  Phosphate (umol/l): 1.581 - 1.581
  Silicate (umol/l): 13.116 - 13.116

Graphical representation

Depth range (m): 598 - 797
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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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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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Etmopterus dislineatus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 3
Species With Barcodes: 1
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Barcode data: Etmopterus dislineatus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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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
This deepwater lantern shark is currently recorded only from the central Coral Sea off Australia on the continental slope. Although the species is known only from a small area and a narrow bathymetric range, further exploratory trawls may indicate a wider distribution. There are presently no major fishing activities in the known area of occurrence, and if captured it is likely discarded due to its small size and lack of commercial value. Survival rates after discarding, however, are not known. Given the global expansion of deepwater trawl fisheries future pressure may be placed on this small species and any increase in fishing activities within its range should monitor the catch of this and other etmopterid species closely. At present, however, there is no reason to suspect a decline in range, habitat quality or number of mature individuals.
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Population

Population
No available information on populations.

Population Trend
Unknown
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Threats

Major Threats
Presently no major fishing activity in its area of occurrence. The species is not targeted in any commercial fisheries. It is unlikely to be captured frequently on any longline gear due to its small size. If captured, it is likely discarded survival rates are unknown (but are likely to be moderate from longline capture and low from trawl capture). However given the global expansion of deepwater trawl fisheries pressure may be placed upon small and medium-sized etmopterid species in the future and this situation should be monitored closely.
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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

Etmopterus dislineatus

Etmopterus dislineatus is a shark of the family Etmopteridae found in the central Coral Sea at depths of between 590 and 800 m. Its length is up to 45 cm.

Reproduction is ovoviviparous.

References[edit]

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