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Blue Warehou (2018)

Seriolella brama

  • Klaas Hartmann (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Bradley Moore (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Paul Rogers (South Australian Research and Development Institute)
  • Rowan Chick (Department of Primary Industries, New South Wales)
  • Nastaran Mazloumi (Australian Bureau of Agricultural and Resource Economics and Sciences)
  • Corey Green (Victorian Fisheries Authority)

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Summary

The highly mobile Blue Warehou can be found east and west of Bass Strait. All stocks are classified as depleted and a rebuilding strategy has been in place since 2008 to prevent targeted fishing.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Fisheries Stock status Indicators
New South Wales Eastern OTF, OTLF Depleted Biomass, fishing mortality, catch
OTF
Ocean Trawl Fishery (NSW)
OTLF
Ocean Trap and Line Fishery (NSW)
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Stock Structure

Blue Warehou is highly mobile with patchy distribution and wide range of spawning areas [Knuckey and Sivakumaran 2001]. Genetic studies have indicated that there are two separate stocks east and west of Bass Strait [Punt 2006, Talman et al. 2004]. The Eastern stock extends offshore from southern New South Wales to southern Tasmania and the Western stock extends offshore from western Tasmania northward to western Victoria. Eastern and Eastern stocks are assessed separately.

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

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Stock Status

Eastern

The Australian Bureau of Agricultural and Resources Economics and Sciences has classified Blue Warehou in Commonwealth waters as overfished since 1999 and the species is currently subject to a stock rebuilding strategy [AFMA 2014]. In February 2015, the species was listed as conservation dependent under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act, Department of the Environment 2015). A single incidental 118 tonnes (t) total allowable catch (TAC) is applied across both the Western and Eastern stocks [Helidoniotis et al. 2017].

Blue Warehou landings in the Southern and Eastern Scalefish and Shark Fishery (SESSF) peaked in 1991 at nearly 2 500 t. Catches then declined rapidly to below 500 t through the early 2000s. Standardised catch per unit effort (CPUE) for both the Eastern and Western Blue Warehou stocks has been below the limit reference point since 1998, with the exception of the Western stock in 1998 and 2005 [Haddon 2013]. The CPUE data since 2012 is relatively meaningless due to the rebuilding strategy and low catch limits changing fishing practices to active avoidance of Blue Warehou. A stock rebuilding strategy was introduced in 2008 and updated in 2014. In the context of Blue Warehou fishing mortality, this aims to prevent targeted fishing by setting TACs that permit only incidental bycatch. A single incidental 118 t TAC applies across both stocks [Helidoniotis et al. 2017]. Landings have been well below this in recent years, there is some discrepancy between logbooks and landings with the 2015–16 catch reported between 2 t and 6.5 t and the 2016–17 catch at 16 t. Additionally, discards between 2012 and 2015 are estimated at 8.7 t [Thomson and Upston 2016]

In New South Wales, commercial fishery data, including catch of Blue Warehou is available from 1997–98, although in many years the data are classified as confidential. In 1998–99 and 1999–00, Blue Warehou catches of 21.7 t and 10.2 t were reported across all New South Wales commercial fisheries, respectively. From 2000–01 to 2016–17 the total reported commercial catch of Blue Warehou has been < 2.5 t per year, with < 1 t being reported in 13 of those 17 years. Recreational and Indigenous catches of Warehou spp. in New South Wales are unknown. Surveys of recreational and Indigenous catches have either not specified catches of Warehou spp. [West et al. 2015] or reported them into a broader ‘finfish - other’ category [Henry and Lyle 2003].

In Victorian waters, Blue Warehou are caught using seines, mesh nets and longlines within the Ocean and Corner Inlet Fisheries. Catch during the 2017 calendar year is confidential as fewer than five licence holders reported landing Blue Warehou. However, catch has remained relatively stable from 2013–14 to 2016–17 at 1–2 t (VFA 2017). Blue Warehou are not targeted in Victorian waters; however, incidental catch from commercial and recreational fishers occurs. As the majority of catch is taken in the SESSF, catch from Victoria is unlikely to influence the biomass of the biological stock.

Blue Warehou landings in the Tasmanian Scalefish Fishery peaked in 1991–92 at 318 t and have since decreased to 7.6 t in 2016–17 [Moore et al. 2018], with approximately two-thirds of this catch assumed to be from the eastern stock. Recreational catches in Tasmania are estimated periodically with estimates of 32.5 t in 2010 and 15.4 t in 2012–13 [Lyle et al. 2014], with the majority of catches assumed to be from the eastern stock.

The above evidence indicates that the Eastern stock is depleted and that recruitment is likely to have been impaired.

Fishing mortality has been constrained by the Commonwealth TAC and catches are low in other jurisdictions. The catch restrictions are intended to allow the stocks to recover from their recruitment impaired state; however, measurable improvements are yet to be detected.

On the basis of the evidence provided above the Blue Warehou Eastern biological stock is classified as depleted.

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Biology

Blue Warehou biology [Knuckey and Sivakumaran 2001]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Blue Warehou 25 years, ~760 mm TL  and 4 kg 3-4 years, mean length at female maturity is about 330 mm LCF 
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Distributions

Distribution of reported commercial catch of Blue Warehou

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Tables

Fishing methods
New South Wales
Commercial
Unspecified
Indigenous
Handline
Recreational
Handline
Management methods
Method New South Wales
Commercial
Gear restrictions
Limited entry
Spatial closures
Indigenous
Native Title
Section 37 (1d)(3)(9), Aboriginal cultural fishing authority
Recreational
Bag limits
Licence
Spatial closures
Catch
New South Wales
Indigenous Unknown
Recreational Unknown

New South Wales – Indigenous (Management Methods) (a) The Aboriginal cultural fishing authority is the authority that Indigenous persons can apply to take catches outside the recreational limits under the Fisheries Management Act 1994 (NSW), Section 37 (1d)(3)(9), Aboriginal cultural fishing authority; and (b) In cases where the Native Title Act 1993 (Cth) applies fishing activity can be undertaken by the person holding native title in line with S.211 of that Act, which provides for fishing activities for the purpose of satisfying their personal, domestic or non-commercial communal needs. In managing the resource where native title has been formally recognised, the native title holders are engaged with to ensure their native title rights are respected and inform management of the State's fisheries resources.

Tasmania – Commercial (catch) Catches reported for the Tasmanian Scalefish Fishery are for the period 1 July to 30 June the following year. The most recent assessment available is for 2016–17.

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. The species is subject to a minimum size limit of 250 mm total length. A bag limit of 10 fish and a possession limit of 20 fish (all Warehou species) is in place for recreational fishers.

Tasmania – Indigenous (management methods) In Tasmania, Indigenous persons 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, Indigenous persons must obtain a unique identifying code (UIC). The policy document Recognition of Aboriginal Fishing Activities for issuing a UIC to a person for Aboriginal Fishing activity explains the steps to take in making an application for a UIC.

Victoria – Indigenous (management Methods) In Victoria, regulations for managing recreational fishing may not apply to fishing activities by Indigenous people. Victorian traditional owners may have rights under the Commonwealth's Native Title Act 1993 to hunt, fish, gather and conduct other cultural activities for their personal, domestic or non-commercial communal needs without the need to obtain a licence. Traditional Owners that have agreements under the Traditional Owner Settlement Act 2010 (Vic) may also be authorised to fish without the requirement to hold a recreational fishing licence. Outside of these arrangements, indigenous Victorians can apply for permits under the Fisheries Act 1995 (Vic) that authorise fishing for specific indigenous cultural ceremonies or events (for example, different catch and size limits or equipment). There were no indigenous permits granted in 2017 and hence no indigenous catch recorded.

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Catch Chart

Commercial catch of Blue Warehou - note confidential catch not shown

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References

  1. AFMA, Blue Warehou (Seriolella brama) Stock Rebuilding Strategy, 2014, AFMA Report.
  2. Haddon, M 2013, Tier 4 Analyses in the SESSF, including Deep Water Species. Data from 1986–2011. In Tuck GN (ed.) 2013, Stock assessment for the Southern and Eastern Scalefish and Shark Fishery 2012, Part 2. Australian Fisheries Management Authority and CSIRO Marine and Atmospheric Research, Hobart. pp. 407–514.
  3. Helidoniotis, F, Koduah, A, Moore, A, Mazloumi, N and Nicol, S 2017, Commonwealth Trawl and Scalefish Hook sectors. Chapter 9, Fishery Status Reports 2017, AFMA.
  4. Henry, GW and Lyle, JM 2003, The national recreational and Indigenous fishing survey. Fisheries Research and Development Corporation, Canberra.
  5. Knuckey, IA and Sivakumaran KP 2001, Reproductive characteristics and per-recruit analyses of blue warehou (Seriolella brama): implications for the South East Fishery of Australia. Marine and Freshwater Research, 52(4) 575–587 
  6. Lyle, JM, Stark, KE and Tracey, SR 2014, 2012–13 survey of recreational fishing in Tasmania. Institute for Marine and Antarctic Studies, Hobart.
  7. Moore B, Lyle J and Hartmann K 2018, Tasmanian Scalefish Fishery Assessment 2016/17. Institute for Marine and Antarctic Studies, University of Tasmania.
  8. Operation of the Environment Protection and Biodiversity Conservation Act 1999, 2015. Legislative Report.
  9. Punt, AE 2006, Updated stock assessment of blue warehou (Seriolella brama) based on data up to 2006, CSIRO SlopeRAG report.
  10. Talman, S, Hamer, P, Robertson, S, Robinson, N, Skinner, A and Smith, DC 2004, Stock structure and spatial dynamics of the warehous: a pilot study. Final Report of FRDC Project 2001/004. Primary Industries Research Victoria, Marine and Freshwater Systems, Department of Primary Industries, Queenscliff, Victoria, 3225 pp.
  11. Thomson, R. Upston, J. SESSF catches and discards for TAC purposes. 2016. CSIRO Report.
  12. Victorian Fisheries Authority Commercial Fish Production Information Bulletin 2017, Victorian Fisheries Authority, Queenscliff, Victoria, Australia.
  13. West, LD, Stark, KE, Murphy, JJ, Lyle, JM and Ochwada-Doyle, FA 2015, Survey of recreational fishing in New South Wales and the ACT, 2013/14. Fisheries Final Report Series No. 149. NSW Department of Primary Industries, Wollongong.