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Spotted Mackerel (2020)

Scomberomorus munroi

  • Alice Pidd (Department of Agriculture and Fisheries, Queensland)
  • John Stewart (Department of Primary Industries, New South Wales)
  • Paul Lewis (Department of Primary Industries and Regional Development, Western Australia)
  • Grant Johnson (Department of Primary Industry and Resources, Northern Territory)
  • Lenore Litherland (Department of Agriculture and Fisheries, Queensland)

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Summary

Spotted Mackerel occurs in two stocks. Stock status is sustainable on the continental shelf waters along Australia's eastern coast. Stock status is negligible across the northern and western coast.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Stock status Indicators
New South Wales Eastern Australia Sustainable

Biomass, Catch, CPUE, Fishery-dependent length and age frequency, Estimates of total mortality rates

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Stock Structure

Spotted Mackerel occurs in continental shelf waters along Australia's western, northern and eastern coast between the Abrolhos Islands region to central New South Wales [Begg et al. 1998a, Cameron and Begg 2002]. In eastern Australian waters, Spotted Mackerel comprise a single stock (confirmed through genetic analysis, otolith microchemistry and tagging studies) that is genetically isolated from fish in the northern Arafura Sea [Begg et al. 1998a,b, Cameron and Begg 2002]. In northern and western Australian waters the delineation of stocks is less clear. Results from an otolith microchemistry study suggest that fish from Gove and Joseph Bonaparte Gulf may belong to separate stocks [Cameron and Begg 2002] although the biological stock boundaries are unknown. Here, assessment of stock status is presented at the biological stock level—Eastern Australia; and the management unit—Northern Australia.

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Stock Status

Eastern Australia

Spotted Mackerel is commonly fished throughout its distribution along the east coast of Australia. Queensland and New South Wales both access the part of the biological stock that occurs in their waters. Most of the fishery occurs in Queensland, with a smaller seasonal fishery in northern New South Wales [Stewart et al. 2015] during late summer–autumn. A 2005 stock assessment indicated that catches in 2002 were near, or above, the estimated maximum sustainable yield (MSY) and that the stock was at risk of being overfished [Begg et al. 2005]. Management measures introduced in Queensland since 2002 have substantially reduced that risk [Litherland et al. 2018]. The measures included a limit on the commercial harvest, the prevention of fishing using ring nets, by-product possession limits for net fishers and a reduced recreational possession limit. As a result of these restrictions, the Queensland commercial net harvest has been stable, but low. A stock assessment in 2018 indicated that the total Queensland harvest sits below MSY, with unfished biomass estimates for 2016-17 sitting between 40-60% [Bessell-Browne et al. 2018]. In 2018–19, the Queensland commercial net and line harvest was 46 tonnes (t), which is below the 10-year average of 56 t and well below the annual commercial catch limit of 140 t [QFISH 2020]. The number of active licences and days fished in 2018–19 was below the 10-year average [QFISH 2020]. The Queensland recreational harvest of Spotted Mackerel decreased between 2000 and 2019 (120 000 fish to 31 000 fish) [Teixeira et al. 2021], reflecting in part the reduction in recreational line fishing effort between 2000 and 2011 [Taylor et al. 2012]. The New South Wales recreational harvest of Spotted Mackerel was similar during 2001 and 2013–14 at between 10 000 and 13 000 fish, estimated to weigh around 41 t [Stewart et al. 2015, West et al. 2015], but may have declined substantially to less than 2 000 fish during the most recent survey during 2017-18, noting that this survey estimate is not robust due to small sample sizes [Murphy et al. 2020].

Standardised catch rates for the Queensland commercial line fishery were below the 10-year average in 2016–17, and the lowest in a 30 year time series [Bessell-Browne et al. 2018]. Nominal catch rates in New South Wales have fluctuated, but show no overall trends over the past 20 years [Stewart et al. 2015, NSWDPI Unpublished data]. The minimum legal size in Queensland and New South Wales is set above the size at maturity for males and equal to the size at maturity for females, providing some protection of the spawning stock [Begg 1998, Begg and Sellin 1998]. Post-capture mortality of Spotted Mackerel is currently unknown. However, indications of at least 50% mortality in Spanish and Grey Mackerel as a result of recreational fishing activity [O’Neill et al. 2018, Bessell-Browne et al. 2019] suggests that other Scomberomorus species may experience a similar susceptibility to discarding. In Queensland, fishery-dependent monitoring of the recreational and commercial harvest shows relatively consistent length structures during the past 10 years [Bessell-Browne et al. 2018]. Fishery-dependent monitoring indicates that a broad range of ages, including older fish (4–10-year-olds) were present in the harvest, with 2–5-year-olds dominating the catch [Bessell-Browne et al. 2018]. Estimates of total mortality rate, derived from the fishery-dependent age composition data, indicate fishing mortality was lower than natural mortality in 2016–17 [Bessell-Browne et al. 2018]. These are positive indicators of a stable spawning biomass with continuing recruitment. The above evidence indicates that the biomass of the stock is unlikely to be depleted and that recruitment is unlikely to be impaired, and that the current level of fishing mortality is unlikely to cause the stock to become recruitment impaired.

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

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Biology

Spotted Mackerel biology [Begg et al. 1998a, Cameron and Begg 2002, Begg et al. 2005, QDAF 2018]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Spotted Mackerel

10 years, 1 230 mm TL 

Females 1–2 years, 600 mm TL Males 1–2 years, 520 mm TL
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Distributions

Distribution of reported commercial catch of Spotted Mackerel

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Tables

Fishing methods
New South Wales
Commercial
Line
Various
Indigenous
Spearfishing
Hook and Line
Recreational
Spearfishing
Hook and Line
Charter
Hook and Line
Management methods
Method New South Wales
Charter
Bag and possession limits
Bag limits
Gear restrictions
Licence
Marine park closures
Size limit
Spatial closures
Commercial
Gear restrictions
Limited entry
Marine park closures
Size limit
Spatial closures
Vessel restrictions
Indigenous
Customary fishing management arrangements
Recreational
Bag and possession limits
Bag limits
Gear restrictions
Licence
Marine park closures
Size limit
Spatial closures
Catch
New South Wales
Commercial 33.56t
Indigenous Unknown
Recreational 1 602 fish (2017-18)

Queensland – recreational (catch) Estimated from Teixeira et al. 2021 (31 219 fish retained by Queensland residents) and average weight of 2.6 kg.

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

New South Wales – Recreational (Catch) Murphy et al. [2020].

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

Western Australia – Recreational (Catch) Statewide survey of boat-based recreational fishing in Western Australia 2017/18 [Ryan et al. 2019]. Shore- based catch (if any) largely unknown.

Western Australia – Recreational (Management methods) Boat-based recreational fishing licence required.

Western Australia – Charter (Catch) The charter catch is an estimate based on numbers of fish caught multiplied by an average weight.

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Catch Chart

Commercial catch of Spotted Mackerel - note confidential catch not shown

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References

  1. Begg, G, Keenan, C and Sellin, M 1998, Genetic variation and stock structure of school mackerel and spotted mackerel in northern Australian waters, Journal of Fish Biology, 53: 543–559.
  2. Begg, GA 1998, 'Reproductive biology of school mackerel (Scomberomorus queenslandicus) and spotted mackerel (S. munroi) in Queensland east-coast waters', Marine and Freshwater Research, 49(3): 261–270.
  3. Begg, GA and Sellin, MJ 1998, 'Age and growth of school mackerel (Scomberomorus queenslandicus) and spotted mackerel (S. munroi) in Queensland east-coast waters with implications for stock structure', Marine and Freshwater Research, 49(2): 109–120.
  4. Begg, GA, Cappo, M, Cameron, DS, Boyle, S, and Sellin, MJ 1998, 'Stock discrimination of school mackerel, Scomberomorus queenslandicus, and spotted mackerel, Scomberomorus munroi, in coastal waters of eastern Australia by analysis of minor and trace elements in whole otoliths', Fishery Bulletin, 96(4): 653–666.
  5. Begg, GA, O'Neill, MF, Cadrin, SX and Bergenius, MAJ 2005, Stock Assessment of the Australian East Coast Spotted Mackerel Fishery, CRC Reef Research Centre, Townsville.
  6. Bessell-Browne, P, O’Neill, MF, and Litherland, L 2018, Stock assessment of the Australian east coast spotted mackerel (Scomberomorus munroi) fishery (2018). Department of Agriculture and Fisheries, Queensland Government. Brisbane, Queensland.
  7. Bessell-Browne, P., Lovett, R., Leigh, G., O’Neill, M. F. & Campbell, A. (2019). Stock assessment of the Australian east coast grey mackerel (Scomberomorus semifasciatus) fishery (2019). Department of Agriculture and Fisheries, Queensland Government. Brisbane, Queensland.
  8. Cameron, D and Begg, G 2002, Fisheries biology and interaction in the northern Australian small mackerel fishery. Final report to Fisheries Research and Development Corporation, Projects 92/144 and 92/144.02, Department of Primary Industries, Queensland.
  9. Litherland, L, Johnson, G, Stewart, J, Lewis, P, 2018, Spotted Mackerel, Scomberomorus munroi, in Carolyn Stewardson, James Andrews, Crispian Ashby, Malcolm Haddon, Klaas Hartmann, Patrick Hone, Peter Horvat, Stephen Mayfield, Anthony Roelofs, Keith Sainsbury, Thor Saunders, John Stewart, Simon Nicol and Brent Wise (eds) 2018, Status of Australian fish stocks reports 2018, Fisheries Research and Development Corporation, Canberra.
  10. 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. NSW DPI - Fisheries Final Report Series No. 158.
  11. O’Neill MF, Langstreth J, Buckley SM, Stewart J 2018 Stock assessment of Australian east coast Spanish mackerel: Predictions of stock status and reference points. Department of Agriculture and Fisheries, Brisbane, Queensland 103 pp.
  12. QFish, Department of Agriculture and Fisheries, www.qfish.gov.au
  13. Ryan, KL, Hall, NG, Lai, EK, Smallwood, CB, Tate, A, Taylor, SM, Wise, BS 2019, State-wide survey of boat based recreational fishing in Western Australia 2017/18, Fisheries Research Report 297, Department of Primary Industries and Regional Development, Western Australia.
  14. Stewart, J, Hegarty, A, Young, C, Fowler, AM and Craig, J 2015, Status of Fisheries Resources in NSW 2013–14, NSW Department of Primary Industries, Mosman.
  15. Taylor, S, Webley, J and McInnes, K 2012, 2010 statewide recreational fishing survey, Department of Agriculture, Fisheries and Forestry, Brisbane, Australia.
  16. Teixeira, D, Janes, R, and Webley, J 2021, 2019–20 Statewide Recreational Fishing Survey Key Results. Project Report. State of Queensland, Brisbane.
  17. Webley, J, McInnes, K, Teixeira, D, Lawson, A and Quinn, R 2015, Statewide Recreational Fishing Survey 2013–14. Department of Agriculture and Fisheries, Queensland.
  18. West, LD, Lyle, JM, Matthews, SR, Stark, KE and Steffe, AS 2012, Survey of Recreational Fishing in the   Northern Territory, 2009-­10, Fishery Report 109, Department of Primary Industry and Fisheries, Darwin.
  19. West, LD, Stark, KE, Murphy, JJ, Lyle JM and 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.

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