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Stout Whiting (2020)

Sillago robusta

  • Anthony Roelofs (Department of Agriculture and Fisheries, Queensland)
  • Karina Hall (NSW Department of Primary Industries)

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Summary

Stout Whiting is a sustainable species found off Australia’s east coast. It occurs in northern NSW and southern QLD waters.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Stock status Indicators
Queensland Eastern Australia Sustainable

Standardised CPUE, age composition

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Stock Structure

The geographic distribution of the east coast Stout Whiting biological stock is restricted to southern Queensland and northern New South Wales. Genetic analysis of Stout Whiting catches from southern Queensland locations indicate that biological sub-stocks are unlikely to exist [Ovenden and Butcher 1999].

Here, assessment of stock status is presented at the biological stock level—Eastern Australia.

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Stock Status

Eastern Australia

On average, 80 per cent of the annual commercial catch is taken in Queensland and 20 per cent in New South Wales, with most information being derived from the Queensland fishery. Evidence for the status of Stout Whiting in Queensland waters is therefore used to determine status for the entire biological stock [Hall 2015]. Annual landings of Stout Whiting in Queensland averaged about 715 tonnes (t) for the fishing years 2014–16, increasing to an average 1 065 t from 2017-19 [Wortman 2020]. Maximum harvest in the past 10 fishing years reached 1 170 t in 2010. In Queensland, the annual total allowable commercial catch (TACC) limit for Stout Whiting has been set at 1 106 t since 2017. The annual TAC is reassessed before the start of each fishing year using both commercial catch rate and age and length data in a decision-support model developed in 2002 [O’Neill et al. 2002]. An annual basket TAC (for combined Stout Whiting and Eastern School Whiting, Sillago flindersi) was introduced in New South Wales in May 2019 and was initially set at 1 189 t [Hall 2020]. This was reduced to 898 t for the 2020–21 fishing season, in response to some sustainability concerns for the co-caught species, Eastern School Whiting. 

Population modelling conducted in 2014 indicated that biomass was marginally above the biomass that would produce MSY [O’Neill and Leigh 2014]. Standardised catch rates for Stout Whiting in Queensland have increased since 2016 to be above the 30-year average [Wortmann 2020]. Similarly, standardised catch rates of Stout Whiting for the prawn trawl fleet of the Ocean Trawl Fishery in northern New South Wales have been relatively stable and above or near the 22-year average since 2006 [Hall 2020]. The above evidence indicates that the biomass of this stock is unlikely to be depleted and that recruitment is unlikely to be impaired.

Fishing pressure for Stout Whiting is effectively constrained by the TACC. Two vessels fished for Stout Whiting since 2013, harvesting an average 1 085 t from Queensland waters, which was approximately 98 per cent of the Queensland annually adjusted TAC [QFISH 2020]. Other than the TACC managed T4 fishing sector, no other sectors are licenced to retain stout whiting that are caught as by-catch. In New South Wales, 59 Ocean Trawl Fishery (OTF) operators landed an estimated 243.2 t of Stout Whiting in 2018–19, following three years of reduced catches that coincided with structural reforms to the fishery [Hall 2018]. The southern extremity of the Stout Whiting distribution overlaps with the northern end of the Eastern School Whiting distribution and reported landings from northern New South Wales are adjusted to account for estimated levels of species misreporting [Hall 2015]. The current level of fishing pressure is unlikely to cause the stock to become recruitment impaired.

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

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Biology

Stout Whiting biology [O’Neill et al. 2002]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Stout Whiting 8 years, 230 mm FL  2–3 years, 14–180 mm FL
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Distributions

Distribution of reported commercial catch of Stout Whiting
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Tables

Fishing methods
Queensland
Commercial
Danish Seine
Trawl
Otter Trawl (Midwater)
Management methods
Method Queensland
Commercial
Catch limits
Gear restrictions
Limited entry
Spatial closures
Temporal closures
Vessel restrictions
Catch
Queensland
Commercial 1.79Kt
Indigenous Negligible
Recreational Negligible

Queensland Queensland reporting period is fishing season (1 January–31 December).

Queensland – Indigenous (management methods) for more information see https://www.daf.qld.gov.au/business-priorities/fisheries/traditional-fishing

New South Wales Commercial catch data are for fiscal years. Reported landings from northern New South Wales have been adjusted to account for estimated species misreporting with Eastern School Whiting, Sillago flindersi [Hall 2020].

New South Wales – Recreational (catch totals) Estimate from Murphy et al. [2020], based on a survey of Recreational Fishing Licence households.

New South Wales – Indigenous (Management Methods) https://www.dpi.nsw.gov.au/fishing/aboriginal-fishing).

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Catch Chart

Commercial catch of Stout Whiting - note confidential catch not shown
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References

  1. Hall, KC 2015, Stout Whiting (Sillago robusta), In: Stewart, J, Hegarty, A, Young, C, Fowler, AM and Craig, J (eds), Status of Fisheries Resources in NSW 2013–14, NSW Department of Primary Industries, Mosman, pp 323–326.
  2. Hall, KC 2018, Stock status summary and supplementary information 2018 – Ocean Trawl Fishery (Inshore Prawn, Offshore Prawn, Deepwater Prawn and Northern Fish Trawl) – Eastern School Whiting and Stout Whiting (Sillago flindersi and Sillago robusta), NSW Department of Primary Industries, Coffs Harbour.
  3. Hall, KC 2020, Stock status summary and supplementary information 2019 – Ocean Trawl Fishery (Inshore Prawn, Offshore Prawn, Deepwater Prawn and Northern Fish Trawl) – Eastern School Whiting and Stout Whiting (Sillago flindersi and Sillago robusta), NSW Department of Primary Industries, Coffs Harbour.
  4. Murphy, JJ, Ochwada-Doyle, FA, West, LD, Stark, KE and Hughes, JM, 2020, The NSW Recreational Fisheries Monitoring Program - survey of recreational fishing, 2017/18. Fisheries Final Report Series No. 158.
  5. O’Neill, MF and Leigh, GM 2014, Queensland stout whiting fishery: commercial quota setting 2014, Department of Agriculture, Fisheries and Forestry, Queensland Government.
  6. O’Neill, MF, Yeomans, K, Breddin, I, Jebreen, E and Butcher, A 2002, The Queensland stout whiting fishery 1991 to 2002, Fisheries Assessment Report, Queensland Department of Primary Industries, Brisbane.
  7. Ovenden, J and Butcher, A 1999, An investigation of migration and possible stock structuring by stout whiting, Sillago robusta, in southern Queensland waters, and its impact on managing the fishery, final report on the pilot program, Southern Fisheries Centre, Queensland Department of Primary Industries, Brisbane.
  8. QFish, Department of Agriculture and Fisheries, www.qfish.gov.au
  9. Wortmann, J 2020, Queensland commercial stout whiting (Sillago robusta) fishery: recommended total allowable catch for 2021. Project Report, State of Queensland.

Downloadable reports

Click the links below to view reports from other years for this fish.