|Scientific Name:||Irolita westraliensis Last & Gledhill, 2008|
|Red List Category & Criteria:||Data Deficient ver 3.1|
|Assessor(s):||Awruch, C.A. & White, W.T.|
|Reviewer(s):||Walls, R.H.L. & Kyne, P.M.|
|Facilitator/Compiler(s):||Kyne, P.M. & Walls, R.H.L.|
The Western Round Skate (Irolita westraliensis) is a poorly-known skate, endemic to a narrow area off Western Australia. Recent taxonomic revision has split the Western Round Skate from the southern form, the Southern Round Skate (I. waitii), and as such it has a restricted range on the outer continental shelf and upper slope at depths of 140–210 m. Its range overlaps with some trawling activities, but there is no information available on bycatch. Spatial closures would provide the species with some refuge from fishing. However, there is insufficient information available to assess the species beyond Data Deficient and details on bycatch and spatial occurrence are required to make an informed assessment.
|Previously published Red List assessments:|
The Western Round Skate is endemic to Western Australia with a restricted range, known only from the outer continental shelf between Exmouth Gulf (21°33′S, 114°05′E) and Imperieuse Reef (18°24′S, 118°29′E) (Last and Gledhill 2008, Last and Stevens 2009).
Native:Australia (Western Australia)
|FAO Marine Fishing Areas:|
Indian Ocean – eastern
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||There are no details of population size, structure or trends.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:|
This skate occurs on the outer continental shelf at depths of 140–210 m (Last and Stevens 2009). It reaches at least 43 cm total length (TL) and adult males mature at about 34–35 cm TL (Last and Gledhill 2008, Last and Stevens 2009).
|Use and Trade:||This skate is not utilized or traded.|
The range of this species overlaps with the Pilbara Fish Trawl Fishery, although bycatch levels are unknown.
|Conservation Actions:||No species-specific conservation actions are currently in place. All sharks and rays are commercially protected under Western Australian law. This regulation essentially restricts the retention of all shark and ray products by commercial fishing vessels other than those operating in the State's managed shark fishery. Research is required to better define its full range, estimate abundance, and examine life history traits. Considerable areas of Western Australia's North Coast Bioregion are permanently closed to all trawling through spatial management arrangements, and there have been reductions in effort quota in the Pilbara Fish Trawl Fishery since 2009 (Fletcher and Santoro 2014).|
Fletcher, W.J. and Santoro, K. 2014. Status Reports of the Fisheries and Aquatic Resources of Western Australia 2013/14: The State of the Fisheries. Department of Fisheries, Western Australia.
IUCN. 2015. The IUCN Red List of Threatened Species. Version 2015-4. Available at: www.iucnredlist.org. (Accessed: 19 November 2015).
IUCN SSC Shark Specialist Group. Specialist Group website. Available at: http://www.iucnssg.org/.
Last, P.R. and Gledhill, D.C. 2008. A new species of round skate, Irolita westraliensis sp. nov. (Rajoidei: Arhynchobatidae), from northern Western Australia. CSIRO Marine and Atmospheric Research Paper 21: 173-181.
Last, P.R. and Stevens, J.D. 2009. Sharks and Rays of Australia. Second Edition. CSIRO Publishing, Collingwood, Australia.
Sainsbury, K.J., Kailola, P.J. and Leyland, G.G. 1985. Continental shelf fishes of northern and north-western Australia. An illustrated Guide. CSIRO Division of Fisheries Research, Canberra, Australia.
|Citation:||Awruch, C.A. & White, W.T. 2015. Irolita westraliensis. The IUCN Red List of Threatened Species 2015: e.T195457A68631044.Downloaded on 24 October 2017.|
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