Overview

Distribution

Range Description

The Black Ghostsharkoccurs off the southern coast of Australia from Portland, Victoria (~3853'S, 14156'E) to Ulladulla, New South Wales (~3521'S, 15028'E), including the waters surrounding Tasmania and its southern seamounts (Didier 2008, Last and Stevens 2009). This species is also known from deepwater commercial fishing areas off New Zealand and is most likely widespread throughout the deeper waters of New Zealand (Didier 2008).
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Southeastern Australia and off New Zealand.
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Southern Ocean: Australia and New Zealand.
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Physical Description

Size

Max. size

109 cm TL (male/unsexed; (Ref. 76967))
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Diagnostic Description

This chimaeroid fish has a ventral caudal fin that that is not indented at its origin to form a separate anal fin, it is distinguished from its congeners by the following characters: color of the body an even dark black or blackish-brown; its dorsal fin spine is longer than height of first dorsal fin; pelvic fins is distinctly round in shape; males with pelvic claspers that are dark at the base with pale tips, divided for the distal 1/3 of their length (Ref. 76967).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology

This ghostshark is found along the continental slope and seamounts at depths of 8701,450 m off southern Australia and 5001,400 m off New Zealand (Didier 2008, Walker et al. 2008, Last and Stevens 2009). It reaches a maximum size of at least 108 cm total length and 66 cm body length (BDL), with males maturing at about 55 cm BDL and females around 60 cm BDL (Didier 2008). Like other members of this family, itis oviparous (unpublished data reported in Walker et al. 2008).


Systems
  • Marine
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Environment

bathydemersal; marine; depth range 866 - 1447 m (Ref. 76967)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Hydrolagus homonycteris

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 16
Species With Barcodes: 1
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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
2015

Assessor/s
Theiss, S.M., Huveneers, C. & Ebert, D.A.

Reviewer/s
Walls, R.H.L. & Kyne, P.M.

Contributor/s
Kyne, P.M.

Justification
The Black Ghostshark (Hydrolagus homonycteris) occurs along continental slopes and seamountsat depths of8701,450 m off southern Australia andat 5001,400 m offNew Zealand. Due to an overlap in habitat, depth and range, it has been a bycatch of benthic deepwater commercial trawl fisheries. This ghostshark was once commonly caught in fisheries targeting Orange Roughy(Hoplostethus atlanticus)off Tasmania, but this fishery has since been closed. As its depth range falls outside the reach of existing deepwater fisheries overlapping with its geographic range, it can be assumed that catch levels are very low or nonexistent. This species is therefore assessed as Least Concern.

History
  • 2011
    Data Deficient (DD)
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Population

Population
This species is apparently common, however there are no details on population size, structure or trends.

Population Trend
Unknown
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Threats

Major Threats

This ghostshark is an infrequent bycatch of benthic deepwater trawl fisheries. Within Australian waters the threat from fisheries is likely to be very low or nonexistent following the closure of the South Tasman Rise Fishery (STRF) in 2007 (Patterson and Mazur 2014). If this fishery were to re-open, it could pose a risk to the Australian part of the population. It has also been reported as rare bycatch from the Southern and Eastern Scalefish and Shark Fishery (SESSF) (Walkeret al.2008), although most of the area of this fishery below 700 m depth is closed to fishing (Georgeson et al. 2014).

The Black Ghostshark is a bycatch of New Zealand deepwater trawl and longline fisheries; the bycatch trend increased slightly in the ling longline fishery between 1990-91 and 2010-11 (MFI 2103).

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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions

No species-specific conservation measures are currently in place and information regarding its biology is required. There are Commonwealth marine reserves within its Australian range, and the closure of the STRF and depth limit on the SESSF should serve to protect this species from capture in these waters as well. Monitoring is recommended with regard to these fisheries re-opening or expanding in future.

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