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Insentiraja subtilispinosa

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA CHONDRICHTHYES RAJIFORMES ARHYNCHOBATIDAE

Scientific Name: Insentiraja subtilispinosa
Species Authority: (Stehmann, 1989)
Common Name(s):
English Velvet Skate
Synonym(s):
Notoraja subtilispinosa Stehmann, 1989
Taxonomic Notes: Shape differences are evident between populations across its range and need further investigation (Last and Compagno 1998). There is a need to ascertain if this species is conspecific with the population in the type locality (i.e., the Philippines).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2009
Date Assessed: 2004-04-07
Assessor(s): Huveneers, C., Stehmann, M. & Last, P.R.
Reviewer(s): Notarbartolo di Sciara, G., Haywood, M. & Valenti, S.V. (Shark Red List Authority)
Justification:
A small, moderately common, deepwater skate found in depths from 600-1,200 m occurring on mid continental slope of the eastern Indian Ocean and Western Central Pacific, off northwestern Australia, Indonesia and Philippines. The species is common in some areas but its distribution is probably patchy. Possibly the most abundant skate in depths of 900-1,100 m throughout its known range, its biology is virtually unknown. It is taken as bycatch by scampi deep trawlers and could be of minor commercial value but is currently discarded. As the species is abundant in deepwater and there is no indication of population decline it is currently assessed as Least Concern. Monitoring of deepwater fisheries and catches is required, and if the level of fishing pressure increases the assessment may need to be revisited.

Geographic Range [top]

Range Description: Occurs in the eastern Indian Ocean and western central Pacific inhabiting soft substrates. Its range is not well defined, but it is known to occur off northwestern Australia, Indonesia and the northern area of the Philippines. It is likely to be more widely distributed through the Indo-Malay Archipelago (Last and Compagno 1998).
Countries:
Native:
Australia (Western Australia); Indonesia; Philippines
FAO Marine Fishing Areas:
Native:
Indian Ocean – eastern; Pacific – western central
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Common in some areas but its distribution is probably patchy. Possibly the most abundant skate in depths of 900-1,100 m throughout its known range (Last and Compagno 1998).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: A small, moderately common, deepwater skate found in the mid continental slope in depths from 600-1,200 m and attains at least 54 cm total length (TL) (Last and Compagno 1998, Last and Stevens 1994). Abundant at depths of 900-1,100 m (Last and Compagno 1998). Males and females mature at about 40-45 cm TL (Stehmann and Last pers. obs.). Its biology is little known. Like other skates this species is oviparous.
Systems: Marine

Threats [top]

Major Threat(s): This species is taken as bycatch by scampi deep trawlers and could be of minor commercial value but is currently discarded (Last and Compagno 1998).

Conservation Actions [top]

Conservation Actions: Careful monitoring of fishing effort in the area of its occurrence is needed.

Citation: Huveneers, C., Stehmann, M. & Last, P.R. 2009. Insentiraja subtilispinosa. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 23 September 2014.
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