Spanish Mackerel (2020)
Date Published: June 2021
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Spanish Mackerel are widely distributed across several fisheries in WA, NT, Qld, NSW and the Torres Strait. Three of the five stocks are sustainable, the Gulf of Carpentaria stock is depleting, and the East Coast stock is depleted.
Stock Status Overview
|Commonwealth||Torres Strait Spanish Mackerel Fishery||Sustainable||
Biomass, fishing mortality, catch and effort
Genetic evidence indicates that there are three biological stocks of Spanish Mackerel across northern Australia [Moore et al. 2003]; however, evidence from otolith microchemistry, parasite analysis and limited adult movement (at scales greater than 100 km) indicates that there are likely to be a number of smaller biological stocks with limited interaction [Buckworth et al. 2007, Lester et al. 2001, Moore et al. 2003]. Each jurisdiction is likely to have multiple biological stocks within its boundaries; however, the difficulty in obtaining relevant biological, and catch and effort, information to assess each stock individually has meant that not all assessments are undertaken at the biological stock level. Those that are, are based on the populations that receive the highest harvest rates; their status can be assumed to be representative of the highest level of exploitation that occurs on any population within each management unit or jurisdiction.
Here, assessment of stock status is presented at the biological stock level—Torres Strait Spanish Mackerel Fishery and East Coast (Queensland and New South Wales); management unit level—Mackerel Managed Fishery (Western Australia), Gulf of Carpentaria (Queensland); and jurisdictional level—Northern Territory.
Torres Strait Spanish Mackerel Fishery
An updated stock assessment for Spanish mackerel was completed in 2019 using data to 2018–19(AFMA 2019). In total, 40 models were run that included combinations of the four CPUE series, five natural mortality rates (0.25, 0.3, 0.35, 0.4 and 0.44) and two historical catch time series, one of which incorporated an annual harvest of 100 t between 1979 and 1986 to account for the presumed unreported catches by Taiwanese gillnet vessels.
Some model runs, particularly where natural mortality was high and a historical Taiwanese gillnet catch was assumed, failed to converge, and were not included in the final grid of 35 models. The median estimated spawning biomass in 2018–19 across the grid of 35 models was 0.23SB0 (ranging from 0.14 to 0.37SB0), with approximately 80% of models estimating spawning biomass above the limit reference point of 0.2SB0
The median estimated harvest rate (F) in 2017–18 across the models was 0.27, which was below the estimated harvest rate at maximum sustainable yield (FMSY) of 0.32. Total catch in 2018–19 was 64.3 t (73.2 t in 2017–18) and below the TAC (115 t).
Declining CPUE and the potential for hyperstability in catch rates is cause for some concern and will need to be monitored closely in coming years. However, spawning biomass continues to remain above the limit reference point which indicates that biomass is not overfished and fishing mortality continues to remain below MSY, which suggests that overfishing is not taking place.
On the basis of the evidence provided above, the Torres Strait Spanish Mackerel Fishery biological stock is classified as a sustainable stock.
Spanish Mackerel biology [McPherson 1992, McPherson 1993, QDAFF 2013]
|Species||Longevity / Maximum Size||Maturity (50 per cent)|
|Spanish Mackerel||26 years, 2400 mm FL||~2 years, 800 mm FL|
Commonwealth – Commercial (active vessels) Total number of TIB licences; this is not an indicator of licence activity.
Commonwealth – Recreational The Australian Government does not manage recreational fishing, including charter fishing, in Commonwealth waters. Recreational and charter fishing in Commonwealth waters is managed by the state or territory immediately adjacent to those waters, under its management regulations.
Commonwealth – Indigenous (a) 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. In the Torres Strait, both commercial and non-commercial Indigenous fishing is managed by the Torres Strait Protected Zone Joint Authority (PZJA) through the Australian Fisheries Management Authority (Commonwealth); the Department of Agriculture, Fisheries and Forestry (Queensland); and the Torres Strait Regional Authority. The PZJA also manages non-Indigenous commercial fishing in the Torres Strait; and (b) Subject to the defence that applies under Section 211 of the Native Title Act 1993 (Cth), and the exemption from a requirement to hold a recreational fishing licence, the non-commercial take by Indigenous fishers is covered by the same arrangements as that for recreational fishing.
Western Australia – Recreational (catch) Western Australian boat-based recreational catch surveys from 1 Sept 2017–30 Aug 2018 [Ryan et al 2019]. Shore-based recreational catches are largely unknown.
Western Australia – Recreational (Management Methods) Western Australian boat-based recreational licence required.
Western Australia – Charter (catch) is an estimate based on numbers of fish caught multiplied by their average weight.
Northern Territory — Charter (management methods) In the Northern Territory, charter operators are regulated through the same management methods as the recreational sector but are subject to additional limits on license and passenger numbers.
Northern Territory – Indigenous (management methods) The Fisheries Act 1988 (NT), specifies that “…without derogating from any other law in force in the Territory, nothing in a provision of this Act or an instrument of a judicial or administrative character made under it limits the right of Aboriginals who have traditionally used the resources of an area of land or water in a traditional manner from continuing to use those resources in that area in that manner”.
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. .
New South Wales – Indigenous (management methods) (https://www.dpi.nsw.gov.au/fishing/aboriginal-fishing
Commercial catch of Spanish Mackerel - note confidential catch not shown. Years shown on this graph are Australian financial years (e.g. 2015 refers to the financial year beginning 01 July 2014 and ending 30 June 2015).
- AFMA 2019, PZJA Torres Strait Finfish Resource Assessment Group meeting number 6, 27–28 November 2019, Australian Fisheries Management Authority, Canberra.
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- Bessell-Browne, P, O'Neill, MF, and Langstreth, J 2020, Stock assessment of the Queensland Gulf of Carpentaria Spanish mackerel (Scomberomorus commerson) fishery, Technical Report, State of Queensland, Brisbane.
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- Buckworth, R, Newman, S, Ovenden, J, Lester, R and McPherson, G 2007, The stock structure of northern and western Australian Spanish Mackerel, Fishery report 88, final report, Fisheries Research and Development Corporation Project 1998/159, Fisheries Group, Northern Territory Department of Business, Industry and Resource Development, Darwin.
- DPIRD 2020, Statewide Large Pelagic Scalefish Resource in Western Australia, Resource Assessment Report 19 , Department of Primary Industries and Regional Development WA.
- Gaughan, DJ and Santoro, K (eds) 2018, Status Reports of the Fisheries and Aquatic Resources of Western Australia 2016/17: The State of the Fisheries. Department of Primary Industries and Regional Development, Western Australia.
- Grubert, M, Saunders, T and Usher, M unpublished, Spanish Mackerel Stock Status Summary: Spanish Mackerel (Scomberomorus commerson) Northern Territory stock.
- Langstreth, J, Williams, A, Stewart, J, Marton, N, Lewis, P and Saunders,T 2018, Spanish Mackerel Scomberomorus commerson, 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.
- Lester, RJG, Thompson, C, Moss, H and Barker, SC 2001, Movement and stock structure of narrow-barred Spanish Mackerel as indicated by parasites, Journal of Fish Biology, 59: 833–842.
- Mackie, M, Gaughan, DJ and Buckworth, RC 2003, Stock assessment of narrow-barred Spanish Mackerel (Scomberomorus commerson) in Western Australia, final report, Fisheries Research and Development Corporation project 1999/151, Western Australian Department of Fisheries, Perth.
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- McPherson, GR 1992, Age and growth of the narrow-barred Spanish Mackerel (Scomberomorus commerson Lacepede, 1800) in north-eastern Queensland waters, Australian Journal of Marine and Freshwater Research, 43: 1269–1282.
- McPherson, GR 1993, Reproductive biology of the narrow-barred Spanish Mackerel (Scomberomorus commerson Lacepede, 1800) in Queensland waters, Asian Fisheries Science, 6: 169–182.
- Moore, BR, Buckworth, RC, Moss, H and Lester, RJG 2003, Stock discrimination and movements of narrow-barred Spanish Mackerel across northern Australia as indicated by parasites, Journal of Fish Biology, 63: 765–779.
- 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.
- Northern Territory Government (NTG) 2009, Fishery Status Reports 2008, Northern Territory Department of Resources. Fishery Report No. 101.
- O’Neill, MF and Tobin, A (unpublished), Torres Strait Spanish mackerel stock assessment II, 2015. Torres Strait AFMA Project Number: RR2014/0823, Department of Agriculture and Fisheries, Queensland Government.
- O’Neill, MF, Langstreth, JC, and Buckley, SM 2018. Stock assessment of Australian east coast Spanish mackerel: predictions of stock status and reference points. Department of Agriculture and Fisheries, Brisbane. 107 pp.
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- QFish, Department of Agriculture and Fisheries, www.qfish.gov.au
- Queensland Department of Agriculture, Fisheries and Forestry 2013, Stock status of Queensland’s fisheries resources 2012, Queensland DAFF, Brisbane.
- 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.
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- Tanimoto, M, Fox, AR, O'Neill, MF and Langstreth, JC 2021, Stock assessment of Australian east coast Spanish mackerel (Scomberomorus commerson), Queensland Department of Agriculture and Fisheries, Brisbane.
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- Webley, J, McInnes, K, Teixeira, D, Lawson, A, Quinn, R 2015, Statewide Recreational Fishing Survey 2013–14, Queensland Department of Agriculture and Fisheries, Brisbane.
- 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.