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Overview

Comprehensive Description

Biology

Found on the continental slope. Probably feeds on small bottom invertebrates and fishes. Ovoviviparous.
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Distribution

Range Description

Northeast Atlantic: along the Atlantic Slope from Scotland (including the northern North Sea), to Ireland, southern England, France, Spain, Portugal, Madeira, the Canary Islands, the Azores (Compagno in prep, Azevedo, Sousa and Brum 2003). Also recently reported from the Mid-Atlantic ridge (Hareide and Garnes 2001).

Eastern Central Atlantic: Morocco, Mauritania, Sahara, Senegal, and possibly southwards to the Gulf of Guinea. Not recorded in the Mediterranean (Compagno in prep).

Based on the presence of this species in the Azores and Mid-Atlantic Ridge, a bathybenthic habitat has been suggested, with spring reproductive migrations to the continental shelf. This represents a significant westward extension of its previously known geographic distribution. It is possible that O. paradoxus is continuously distributed along the north-eastern Atlantic floor, deeper than presently known. Alternatively, separate slope and ridge populations may exist (Azavedo et al. 2003).
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Eastern Atlantic: Atlantic slope from Scotland to Senegal.
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Eastern North Atlantic: Scotland and northwestern North Sea south to Senegal.
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Physical Description

Size

Maximum size: 1180 mm TL
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Max. size

120 cm TL (male/unsexed; (Ref. 35388))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
An uncommon deepwater bottom shark found on the continental slope at depths from 265–720 m. Its maximum size is about 118 cm total length (TL), while size at birth about 25 cm TL. Reproduction is ovoviviparous.

Systems
  • Marine
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Environment

bathydemersal; marine; depth range 265 - 720 m (Ref. 35388)
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Depth range based on 5 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 91 - 637
  Temperature range (°C): 8.139 - 10.187
  Nitrate (umol/L): 8.645 - 13.217
  Salinity (PPS): 35.260 - 35.453
  Oxygen (ml/l): 5.836 - 6.096
  Phosphate (umol/l): 0.722 - 0.887
  Silicate (umol/l): 3.062 - 6.414

Graphical representation

Depth range (m): 91 - 637

Temperature range (°C): 8.139 - 10.187

Nitrate (umol/L): 8.645 - 13.217

Salinity (PPS): 35.260 - 35.453

Oxygen (ml/l): 5.836 - 6.096

Phosphate (umol/l): 0.722 - 0.887

Silicate (umol/l): 3.062 - 6.414
 
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Depth: 265 - 720m.
From 265 to 720 meters.

Habitat: bathydemersal. Found on the continental slope. Probably feeds on small bottom invertebrates and fishes. Ovoviviparous.
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Trophic Strategy

Probably feeds on small bottom invertebrates and fishes.
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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

Barcode data: Oxynotus paradoxus

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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Statistics of barcoding coverage: Oxynotus paradoxus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 4
Species With Barcodes: 1
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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
Soldo, A. & Freitas, M.

Reviewer/s
Dudley, S., Valenti, S.V. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
The Sailfin Roughshark (Oxynotus paradoxus) is an uncommon deepwater bottom shark found at depths from 265–720 m. The species reaches a maximum reported size of up to 118 cm total length. Moderately abundant in deeper offshore waters off the British Isles. The species is probably taken as bycatch of offshore trawling fleets but no information is available on frequency. The species’ known depth range is entirely within the range of deepwater fisheries operating in the Northeast Atlantic, although the Mid-Atlantic ridge and southern part of its range probably offer some refuge from fishing pressure. Furthermore, it is possible that the Sailfin Roughshark is continuously distributed along the northeast and eastern central Atlantic floor, deeper than presently known. Alternatively, separate slope and ridge populations may exist. Given the paucity of information available on this species it is assessed as Data Deficient. Research is needed to better define the distribution, population structure and the impact of fisheries on the species.
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Population

Population
Moderately abundant off the British Isles. Catches in the waters of the British Isles indicate that O. paradoxus is rare in inshore waters (three individuals were reported from Irish inshore waters by Quigley and Flannery 1994), but numerous others have been caught in deeper offshore waters (Ni Mhurachu and O’Connor 1987, Henderson 1996, Quigley and Flannery 1996).

Population Trend
Unknown
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Threats

Major Threats
This species is an uncommon bycatch of offshore trawling fleets (Compagno 1984). There is a continuing trend for deepwater fisheries in the northeast Atlantic, with overall concern for the status of deepwater species. Trawl and gillnet fisheries operate throughout the species’ known depth range in areas of the northeast Atlantic (see ICES 2006, 2007 for further information on the fisheries), but no information is available on the bycatch of this species.

The Mid-Atlantic ridge and southern part of the species’ range, off the western Africa coast, may offer some refuge from fishing pressure, particularly if the species’ is continuously distributed along the northeast and Eastern Central Atlantic floor, deeper than presently known.
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Data deficient (DD)
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Management

Conservation Actions

Conservation Actions
No measures are in place. Further research is required to determine the true extent of the range of the species. Like many poorly known deepwater species, research is also required into life history characteristics.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: minor commercial; price category: unknown; price reliability:
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