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Blue-eye Trevalla

Hyperoglyphe antarctica

  • Lee Georgeson (Australian Bureau of Agricultural and Resource Economics and Sciences)
  • Anthony Roelofs (Department of Agriculture and Fisheries, Queensland)
  • Corey Wakefield (Department of Fisheries, Western Australia)
  • Jeremy Lyle (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Rowan Chick (Department of Primary Industries, New South Wales)

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Stock Status Overview

Stock status determination
Jurisdiction Stock Fisheries Stock status Indicators
Western Australia Western Australia JASDGDLMF, WCDSIMF, WL (SC) Sustainable Catch, fishing mortality
JASDGDLMF
Joint Authority Southern Demersal Gillnet and Demersal Longline Managed Fishery (Zone 1 & Zone 2) (WA)
WCDSIMF
West Coast Demersal Scalefish (Interim) Managed Fishery (WA)
WL (SC)
Open Access in the South Coast (WA)
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Stock Structure

A single biological stock of Blue-eye Trevalla (incorporating the continental shelf, seamounts and the Cascade Plateau) is assumed for eastern Australian waters, separate from the New Zealand stock(s)1. The connectivity between south-western and south-eastern Australia is unknown; considering their relative isolation by distance, it is assumed that south-western Australia represents a single biological stock, separate to an eastern Australian stock.

Genetic studies have found no evidence of Blue-eye Trevalla population structuring between different regions in the area of the Southern and Eastern Scalefish and Shark Fishery (SESSF)2. However, otolith microchemistry (elemental and stable isotope analysis) has suggested some stock structuring, principally between the East Coast Deepwater Trawl Sector offshore seamount fishery and the New Zealand region (which appear to form one group) and the rest of Australia’s SESSF3. Sampling of ages and lengths of individuals recruited to the fishery also suggests heterogeneity in size and age composition between different areas of the SESSF3. The Commonwealth Scientific and Industrial Research Organisation is using otolith chemistry to investigate Blue-eye Trevalla subpopulation structure, to clarify connectivity between the SESSF, the East Coast Deepwater Zone and on seamounts and the Lord Howe Rise outside Australia’s exclusive economic zone. The project is also using ocean circulation models to infer patterns of dispersal and recruitment.

Here, assessment of stock status is presented at the biological stock level—Eastern Australian and Western Australian.

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Stock Status

Western Australia

Stock assessment for Blue-eye Trevalla in the Western Australian biological stock is based on assessment of fishing mortality derived from catch curve analysis of representative samples of the age structure in the state-managed demersal fisheries (West Coast Demersal Scalefish Interim Managed Fishery, Joint Authority Southern Demersal Gillnet and Demersal Longline Managed Fishery and Wet Line Fishery [South Coast] [Western Australia]). These fishing mortality based assessments use reference levels based on ratios of fishing mortality (F) and natural mortality (M) for each species: Ftarget = 2/3M, Fthreshold = M and Flimit = 3/2M. Recent fishing mortality based assessments indicated that the estimated fishing mortality rate on Blue-eye Trevalla in this biological stock was stable at close to the threshold level in 2011 and 2014. This indicates that current fishing pressure is not having an unacceptable impact on the age structure of the population. The above evidence indicates that the biomass of this stock is unlikely to be recruitment overfished.

Blue-eye Trevalla catches from the state-managed demersal fisheries (Western Australian biological stock) from 1999–2015 ranged between 1.4 and 19.0 t, with catches in recent years (2008–15) averaging 4.6 t per year. The above evidence indicates that the current level of fishing pressure is unlikely to cause the stock to become recruitment overfished.

On the basis of the evidence provided above, the Western Australian biological stock is classified as a sustainable stock.

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Biology

Blue-eye Trevalla biology12,13

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Blue-eye Trevalla Eastern Australia: 42 years; 1 400 mm TL Western Australia: 65 years; 1 300 mm TL Males 620 mm TL, females 720 mm TL Males 8–9 years, females 11–12 years
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Distributions

Distribution of reported commercial catch of Blue-eye Trevalla

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Tables

Fishing methods
Western Australia
Commercial
Various
Recreational
Hand Line, Hand Reel or Powered Reels
Management methods
Method Western Australia
Commercial
Gear restrictions
Limited entry
Spatial closures
Spatial zoning
Total allowable effort
Vessel restrictions
Recreational
Bag limits
Licence
Limited entry
Passenger restrictions
Spatial closures
Spatial zoning
Active vessels
Western Australia
21 in JASDGDLMF, 37 in WCDSCMF, 69 in WL (SC)
JASDGDLMF
Joint Authority Southern Demersal Gillnet and Demersal Longline Managed Fishery (Zone 1 & Zone 2) (WA)
WCDSCMF
West Coast Deep Sea Crustacean Managed Fishery (WA)
WL (SC)
Open Access in the South Coast (WA)
Catch
Western Australia
Commercial 208.73kg in JASDGDLMF, 736.00kg in WCDSIMF, 3.18t in WL (SC)
Indigenous Unknown
Recreational Negligible
JASDGDLMF
Joint Authority Southern Demersal Gillnet and Demersal Longline Managed Fishery (Zone 1 & Zone 2) (WA)
WCDSIMF
West Coast Demersal Scalefish (Interim) Managed Fishery (WA)
WL (SC)
Open Access in the South Coast (WA)

a New South Wales – Commercial Dropline cannot be automated in New South Wales.
b Commonwealth – Recreational The Australian Government does not manage recreational fishing in Commonwealth waters. Recreational fishing in Commonwealth waters is managed by the state or territory immediately adjacent to those waters, under its management regulations.
c Commonwealth – Indigenous The Australian Government does not manage non-commercial Indigenous fishing in Commonwealth waters, with the exception of the Torres Strait. In general, non-commercial Indigenous fishing in Commonwealth waters is managed by the state or territory immediately adjacent to those waters.
d New South Wales – Indigenous (management methods) Aboriginal Cultural Fishing Interim Access Arrangement - allows an Indigenous fisher in New South Wales to take in excess of a recreational bag limit in certain circumstances, for example, if they are doing so to provide fish to other community members who cannot harvest themselves.
e New South Wales – Indigenous (fishing methods) Aboriginal cultural fishing authority - the authority that Indigenous persons can apply to take catches outside the recreational limits under the Fisheries Management Act 1994 (NSW), Section 37 (1)(c1), Aboriginal cultural fishing authority.
f Queensland – Indigenous (management methods) In Queensland, under the Fisheries Act 1994 (Qld), Indigenous fishers are able to use prescribed traditional and non-commercial fishing apparatus in waters open to fishing. Size and possession limits, and seasonal closures do not apply to Indigenous fishers. Further exemptions to fishery regulations may be applied for through permits.
g Tasmania –  Recreational (management methods) In Tasmania, a recreational licence is required for fishers using dropline or longline gear, along with nets, such as gillnet or beach seine.
h Tasmania – Charter (management methods) In New South Wales there are four charter boat endorsement categories (Estuarine Fishing; Nearshore Bottom Fishing and Sportfishing; Gamefishing; and Deep Sea Bottom Fishing). The different categories have limitations on the species of fish they can access.
i Tasmania – Indigenous (management methods) In Tasmania, aborigines engaged in aboriginal fishing activities in marine waters are exempt from holding recreational fishing licences, but must comply with all other fisheries rules as if they were licensed. Additionally, recreational bag and possession limits also apply. If using pots, rings, set lines or gillnets, Aborigines must obtain a unique identifying code (UIC). The policy document Recognition of Aboriginal Fishing Activities for issuing a Unique Identifying Code (UIC) to a person for Aboriginal Fishing activity explains the steps to take in making an application for a UIC.

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Catch Chart

Commercial catch of Blue-eye Trevalla

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Effects of fishing on the marine environment

  • Interactions can occur with animals protected under the Environment Protection and Biodiversity Conservation Act 1999, including marine mammals, seabirds, some shark species and seahorses and pipefish (syngnathids). These interactions are reported quarterly by the Australian Fisheries Management Authority15 and on-board observer programs are used to validate the reporting in commercial logbooks.
  • Most of the catch of Blue-eye Trevalla is taken using bottom longline or dropline methods, some of which are automated. These methods may result in interactions with seabirds, marine mammals and marine reptiles. The Threat Abatement Plan 2014 for the incidental catch (or bycatch) of seabirds during longline fishing operations16 aims to achieve zero bycatch of seabirds from longline fishing in Commonwealth fisheries.
  • From 1 May 2017, all vessels in the Southern and Eastern Scalefish and Shark Fishery (Commonwealth Trawl Sector) and Southern and Eastern Scalefish and Shark Fishery (Great Australia Bight Trawl Sector) (Commonwealth) fisheries must use one of the following mitigation devices: sprayers, bird bafflers or pinkies, with zero discharge of fish waste17.
  • The Australian Government is currently developing a National Plan of Action for seabirds, which is intended to specify seabird interaction mitigation requirements for all Commonwealth and jointly-managed fisheries using all fishing methods.
  • The Blue-eye Trevalla fishery is known to interact with Orcas (Orcinus orca), which can cause fish losses through predation. There are no reported Orca mortalities as a result of Blue-eye Trevalla longline/dropline fishing.
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Environmental effects on Blue-eye Trevalla

  • Blue-eye Trevalla is a deepwater species that spends most of its life in close association with the seabed at depths of between 200 and 600 m. Juveniles have been found at the surface, mostly in association with floating kelp and other debris, and can also occur at mid-depths. Larvae and juveniles may be partly dependent on ocean currents for dispersion (unpublished data, Commonwealth Scientific and Industrial Research Organisation).
  • Climate change may cause major changes in species distribution, community composition and ecosystem function for south-east Australian demersal fisheries18.
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References

  1. 1 Morison, AK, Knuckey, IA, Simpfendorfer, CA and Buckworth, RC 2013, South East Scalefish and Shark Fishery: draft 2012 stock assessment summaries for species assessed by GABRAG, ShelfRAG and Slope/DeepRAG, report for AFMA, Canberra.
  2. 2 Robinson, N, Skinner, A, Sethuraman, L, McPartlan, H, Murray, ND, Knuckey, I, Smith, D, Hindell, J and Talman, S 2008, 'Genetic stock structure of blue-eye trevalla (Hyperoglyphe antarctica) and warehous (Seriolella brama and Seriolella punctata) in south-eastern Australian waters', Marine and Freshwater Research, vol. 59, no. 6, pp. 502–14.
  3. 3 Hindell, J, Hamer, P, McPartlan, H and Robertson, S 2006, Preliminary assessment of the utility of otolith microchemistry, otolith shape analysis and mitochondrial DNA analyses in stock discrimination of blue eye trevalla (Hyperoglyphe Antarctica) from Australian shelf waters and offshore seamounts and New Zealand, final report, FRDC project 2003/045, Marine and Freshwater Systems, Primary Industries Research Victoria, Queenscliff.
  4. 4 Webley, J, McInnes, K, Teixeira, D, Lawson, A, and Quinn, R 2015, Statewide Recreational Fishing Survey 2013-14, Queensland Department of Agriculture and Fisheries, Brisbane.
  5. 5 SlopeRAG 2014, 'Southern and Eastern Scalefish and Shark Fishery Slope Resource Assessment Group (SlopeRAG), minutes, 24–26 September 2014, Hobart', SlopeRAG, AFMA, Canberra.
  6. 6 SlopeRAG 2014, 'SESSF Fishery Slope Resource Assessment Group (SlopeRAG), minutes, 30 October 2014, Hobart', SlopeRAG, AFMA, Canberra.
  7. 7 Haddon, M 2013, Blue eye fishery characterization, CSIRO Marine and Atmospheric Research, Hobart.
  8. 8 Haddon, M 2015, Tier 4 Analyses of Selected Species in the SESSF. Data from 1986 – 2014 draft version, CSIRO Oceans and Atmosphere, Hobart.
  9. 9 SlopeRAG 2015, 'SESS Fishery Slope Resource Assessment Group (SlopeRAG) Meeting #1 September 2015 Meeting Minutes, 23-25 September 2015, Hobart', Australian Fisheries Management Authority, Canberra.
  10. 10 SlopeRAG 2015, 'SESS Fishery Slope Resource Assessment Group (SlopeRAG) Meeting #2 October 2015 Meeting Minutes, 28-30 October 2015, Hobart', Australian Fisheries Management Authority, Canberra.
  11. 11 AFMA 2016, CatchWatch - Southern and Eastern Scalefish and Shark Fishery 2015.
  12. 12 Stobutzki, I, Patterson, H, Ward, P, Sampaklis, A, Sahlqvist, P, Moore, A and Viera, S 2009, Commonwealth Trawl and Scalefish Hook Sectors, in Wilson, D, Curtotti, R and Begg, G (eds) 2009, Fishery status reports 2009: status of fish stocks and fisheries managed by the Australian Government, Australian Bureau of Agricultural and Resource Economics – Bureau of Rural Sciences, Canberra.
  13. 13 Baelde, P 1995, Blue-eye trevalla 1994, compiled by Pascale Baelde for the South East Fishery Assessment Group, Australian Fisheries Management Authority, Canberra.
  14. 14 Tracey, SR, Lyle, JM, Ewing, G, Hartmann, K and Mapleston, A 2013, Offshore recreational fishing in Tasmania 2011/12, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart.
  15. 15 Australian Fisheries Management Authority, Protected species interaction reports, AFMA, Canberra.
  16. 16 Commonwealth of Australia 2014, Threat Abatement Plan 2014 for the incidental catch (or bycatch) of seabirds during oceanic longline fishing operations, Australian Antarctic Division, Australian Government Department of the Environment, Canberra.
  17. 17 AFMA 2016, AFMA moves to strengthen seabird safety, AFMA media release 15 July 2016.
  18. 18 Hobday, A, Poloczanska, E and Matear, R (eds) 2008, Implications of climate change for Australian fisheries and aquaculture: a preliminary assessment, report to the Australian Government Department of Climate Change, Canberra.