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Asymbolus occiduus 

Scope: Global
Language: English
Status_ne_offStatus_dd_offStatus_lc_onStatus_nt_offStatus_vu_offStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Chondrichthyes Carcharhiniformes Scyliorhinidae

Scientific Name: Asymbolus occiduus Last, Gomon & Gledhill, 1999
Common Name(s):
English Western Spotted Catshark
Taxonomic Source(s): Eschmeyer, W.N., Fricke, R. and Van der Laan, R. (eds). 2016. Catalog of Fishes: genera, species, references. Updated 2 May 2016. Available at: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp. (Accessed: 2 May 2016).
Taxonomic Notes: Synonym = Halaelurus analis Scott et al., 1980 (misidentification).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2016
Date Assessed: 2015-05-07
Assessor(s): Simpfendorfer, C. & Heupel, M.R.
Reviewer(s): Walls, R.H.L., Bigman, J.S. & Kyne, P.M.
Contributor(s): Smyth, W. & Kyne, P.M.
Facilitator/Compiler(s): Kyne, P.M., Walls, R.H.L., Simpfendorfer, C. & Chin, A.
Justification:
The Western Spotted Catshark (Asymbolus occiduus) is a little known temperate catshark, endemic to southern Australia. It occurs on the outer continental shelf and upper slope at depths of 98–400 m depth. It is a very small component of trawl bycatch, but fishing effort is low over most of its range. Due to its small size (to 60 cm total length) and limited fishing effort, this species is unlikely to be negatively affected by commercial fisheries. It is therefore assessed as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The Western Spotted Catshark is distributed off the southwestern coast of Australia from Fowlers Bay in South Australia to Perth in Western Australia (Last and Stevens 2009).
Countries occurrence:
Native:
Australia (South Australia, Western Australia)
FAO Marine Fishing Areas:
Native:
Indian Ocean – eastern
Additional data:
Lower depth limit (metres):400
Upper depth limit (metres):98
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Nothing is known about the population size or trend of this species, although it is reportedly common off Western Australia (Last and Stevens 2009).
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This catshark is found at depths of 98–400 m and is most abundant on the outer continental shelf (Last and Stevens 2009). It reaches at least 60 cm total length (TL) with males mature at 58 cm TL (Last and Stevens 2009). The biology of this species is almost entirely unknown.
Systems:Marine

Use and Trade [top]

Use and Trade: This species is not likely to be utilized due to its small size and habitat; it is discarded when caught in the Great Australian Bight Trawl Sector of the Southern and Eastern Scalefish and Shark Fishery (Walker and Gason 2007).

Threats [top]

Major Threat(s): This species is caught incidentally and very infrequently in the Great Australian Bight Trawl Sector of the Southern and Eastern Scalefish and Shark Fishery, with an estimated 69 kg of the species caught and discarded annually from 2000–2006 (Walker and Gason 2007). The fishery has decreased in fishing effort and number of operating vessels in recent years (Georgeson et al. 2015, Moore and Curtotti 2015). This species may also be a bycatch of the Western Deepwater Trawl Fishery, however, effort is currently very low in that fishery (Chambers and Bath 2015).

Conservation Actions [top]

Conservation Actions: Currently no conservation measures are in place for this species. Potentially it occurs in the South-west Commonwealth Marine Reserves Network, however, the management plans for the network have not yet been implemented (as of February 2016).

Classifications [top]

9. Marine Neritic -> 9.6. Marine Neritic - Subtidal Muddy
suitability:Suitable season:resident 
11. Marine Deep Benthic -> 11.1. Marine Deep Benthic - Continental Slope/Bathyl Zone (200-4,000m) -> 11.1.1. Hard Substrate
suitability:Suitable season:resident 
11. Marine Deep Benthic -> 11.1. Marine Deep Benthic - Continental Slope/Bathyl Zone (200-4,000m) -> 11.1.2. Soft Substrate
suitability:Suitable season:resident 

In-Place Research, Monitoring and Planning
  Action Recovery plan:No
  Systematic monitoring scheme:No
In-Place Land/Water Protection and Management
  Conservation sites identified:No
  Occur in at least one PA:Yes
  Area based regional management plan:No
  Invasive species control or prevention:Not Applicable
In-Place Species Management
  Harvest management plan:No
  Successfully reintroduced or introduced beningly:No
  Subject to ex-situ conservation:No
In-Place Education
  Subject to recent education and awareness programmes:No
  Included in international legislation:No
  Subject to any international management/trade controls:No
5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.4. Unintentional effects: (large scale) [harvest]
♦ timing:Ongoing ♦ scope:Minority (<50%) ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Chambers, M. and Bath, A. 2015. Western Deepwater Trawl Fishery. In: Patterson, H., Georgeson, L., Stobutzki, I. and Curtotti, R. (eds), Fishery Status Reports 2015, Australian Bureau of Agricultural and Resource Economics and Sciences, Canberra.

Georgeson, L., Ward, P. and Curtotti, R. 2015. Southern and Eastern Scalefish and Shark Fishery. In: Patterson, H., Georgeson, L., Stobutzki, I. and Curtotti, R. (eds), Fishery Status Reports 2015, pp. 111-127. Australian Bureau of Agricultural and Resource Economics and Sciences, Canberra.

IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-1. Available at: www.iucnredlist.org. (Accessed: 30 June 2016).

IUCN SSC Shark Specialist Group. Specialist Group website. Available at: http://www.iucnssg.org/.

Last, P.R. and Stevens, J.D. 2009. Sharks and Rays of Australia. Second Edition. CSIRO Publishing, Collingwood, Australia.

Moore, A. and Curtotti, R. 2015. Great Australian Bight Trawl Sector. In: Patterson, H., Georgeson, L., Stobutzki, I. and Curtotti, R. (eds), Fishery Status Reports 2015, pp. 226-243. Australian Bureau of Agricultural and Resource Economics and Sciences, Canberra.

Walker, T.I. and Gason, A.S. 2007. Shark and other chondrichthyan byproduct and bycatch estimation in the Southern and Eastern Scalefish and Shark Fishery. Final report to Fisheries Research and Development Corporation Project No. 2001/007. (July 2007.) . pp. 182 + vi. Primary Industries Research Victoria: Queenscliff, Victoria, Australia, Victoria.


Citation: Simpfendorfer, C. & Heupel, M.R. 2016. Asymbolus occiduus. The IUCN Red List of Threatened Species 2016: e.T41722A68609519. . Downloaded on 26 September 2017.
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