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Southern Sand Flathead (2020)

Platycephalus bassensis

  • Jeff Norriss (Department of Primary Industries and Regional Development, Western Australia)
  • Nils Krueck (Institute for Marine and Antarctic Studies, University of Tasmania)
  • Paul Rogers (SARDI Aquatic Sciences, South Australia)
  • Victorian Fisheries Authority (Victorian Fisheries Authority)

Date Published: June 2021

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Summary

Southern Sand Flathead is popular with recreational fishers. It is found in shallow waters around southern Australia. In VIC, one stock is sustainable, one is recovering, and one is undefined. The TAS stock is depleting, the SA stock is undefined and the WA stock is negligible.  

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Stock Status Overview

Stock status determination
Jurisdiction Stock Stock status Indicators
Tasmania Tasmania Depleting

Catch, CPUE, length and age composition, fishery-independent survey

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Stock Structure

Southern Sand Flathead (Platycephalus bassensis) is endemic to Australia and inhabits bays, inlets, estuaries and shallow coastal waters to a depth of around 100 m from the central New South Wales coast, around Tasmania to South Australia and southern Western Australia [Gomon et al. 2008]. There is some evidence of regional sub-populations with differences in physical characteristics, recruitment dynamics and growth rates. Information from tagging, larval sampling and growth rate studies [Brown 1977, Hamer et al. 2010, Hirst et al. 2014], indicate that Southern Sand Flathead in Port Phillip Bay, Victoria, comprise a distinct biological stock that has slower growth, and asymptotic length that is 30 per cent smaller than fish from Bass Strait and 20 per cent smaller than fish from south east Tasmania [Hirst et al. 2014, Koopman et al. 2009]. However, biological stock structure has not been studied in detail in other areas and each of the State jurisdictions have different management arrangements for Southern Sand Flathead.

Here, assessment of stock status is presented at the biological stock level—Port Phillip Bay (Victoria); at the management unit level—Corner Inlet and Victoria Other (Victoria); and at the jurisdictional level—Western Australia, Tasmania, and South Australia.

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Stock Status

Tasmania

In Tasmanian waters, Southern Sand Flathead are targeted primarily by recreational fishers. Commercial catches are comparatively minor. Commercial fishing methods include hook and line gears (primarily), gillnet and Danish seine. Records of commercial landings show peak catches of roughly 10-15 t between 1995/96 and 2008/09. From then on, commercial catches have declined to less than 10 t, amounting to only 3.5 t and 2.8 t in 2017/18 and 2018/19, respectively [Krueck et al. 2020]. Recreational catches of Southern Sand Flathead are substantially higher, with an estimated total of 184 t landed in 2017/18 [Lyle et al. 2019]. The low commercial catch relative to that taken by the recreational sector means that limited inferences can be made about stock status based on commercial catch and effort data. Thus, fishery-independent surveys were implemented using fishing gear and targeting practices typical of recreational fishers in areas of significant effort [Ewing et al. 2014]. Surveys have been conducted annually since 2012 and provide data on catch rates as well as the age and size composition of Southern Sand Flathead. Survey results indicated low abundances of legal sized fish, particularly in south-eastern Tasmania. In November 2015, recreational daily bag limits were therefore reduced from 30 to 20 and the minimum legal size increased from 300 to 320 mm. Continued monitoring and analysis of survey data indicate that these changes may benefit populations, but that current levels of fishing mortality remain above recommendable levels, particularly for females [Krueck et al. 2020]. On the basis of this information, Southern Sand Flathead in Tasmania is classified as depleting.

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Biology

Southern Sand Flathead biology [Bani and Moltschaniwskyj 2008, Brown 1977, Jordan 1998, Koopman et al. 2004]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Southern Sand Flathead 23 years (both sexes) Males 370 mm TL Females 480 mm TL Males 2.5–3.5 years, 210 mm TL Females 2.6–5.2 years, 235 mm TL
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Distributions

Distribution of reported commercial catch of Southern Sand Flathead
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Tables

Fishing methods
Tasmania
Commercial
Hand Line, Hand Reel or Powered Reels
Unspecified
Indigenous
Hook and Line
Gillnet
Recreational
Hook and Line
Gillnet
Management methods
Method Tasmania
Charter
Bag limits
Marine park closures
Size limit
Commercial
Gear restrictions
Limited entry
Size limit
Spatial closures
Vessel restrictions
Indigenous
Bag and possession limits
Bag limits
Gear restrictions
Size limit
Spatial closures
Recreational
Bag and possession limits
Bag limits
Gear restrictions
Licence
Size limit
Spatial closures
Catch
Tasmania
Commercial 2.84t
Indigenous Unknown
Recreational 184 t (2017/18)

Victoria – Indigenous (Management Methods) A person who identifies as Aboriginal or Torres Strait Islander is exempt from the need to obtain a Victorian recreational fishing licence, provided they comply with all other rules that apply to recreational fishers, including rules on equipment, catch limits, size limits and restricted areas. Traditional (non-commercial) fishing activities that are carried out by members of a traditional owner group entity under an agreement pursuant to Victoria’s Traditional Owner Settlement Act 2010 are also exempt from the need to hold a recreational fishing licence, subject to any conditions outlined in the agreement. Native title holders are also exempt from the need to obtain a recreational fishing licence under the provisions of the Commonwealth’s Native Title Act 1993.

TasmaniaCommercial (Catches) 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 320 mm. A bag limit of 20 fish and a possession limit of 30 fish (Sand and Tiger Flathead) is in place for recreational fishers.

Tasmania – Indigenous (Management methods) In Tasmania, Indigenous persons engaged in traditional 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. For details, see the policy document "Recognition of Aboriginal Fishing Activities” (https://dpipwe.tas.gov.au/Documents/Policy%20for%20Aboriginal%20tags%20and%20alloting%20an%20UIC.pdf).

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Catch Chart

Commercial catch of Southern Sand Flathead - note confidential catch not shown
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References

  1. Bani, A and Moltschaniwskyj, NA 2008, Spatio-temporal variability in reproductive ecology of Sand Flathead, Platycephalus bassensis, in three Tasmanian inshore habitats: potential implications for management. Journal of Applied Icthyology ,24: 555–561.
  2. Brown, IW 1977, Ecology of three sympatric flatheads (Platycephalidae) in Port Phillip Bay, Victoria. PhD thesis, Monash University, Victoria.
  3. Conron, S, Green, C, Hamer, P, Giri, K and Hall, K 2016, Corner Inlet-Nooramunga Fishery Assessment 2016, Fisheries Victoria Science Report Series No. 11.
  4. Conron, S, Hamer, P and Jenkins, G 2016, Western Port Fishery Assessment 2015, Recreational Fishing Grants Program Research Report, Fisheries Victoria, Department of Economic Development, Jobs, Transport and Resources.
  5. Conron, SD, Bell, JD, Ingram, BA and Gorfine, HK 2020, Review of key Victorian fish stocks — 2019, Victorian Fisheries Authority Science Report Series No. 15, First Edition, November 2020. VFA: Queenscliff. 176pp.
  6. Ewing, GP, Lyle, JM and Mapstone, A 2014, Developing a low-cost monitoring regime to assess relative abundance and population characteristics of sand flathead, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart.
  7. Giri, K and Hall, K 2015, South Australian Recreational Fishing Survey, Fisheries Victoria Internal Report Series No. 62.
  8. Gomon, M, Bray, D and Kuiter, R (ed) 2008, Fishes of Australia's southern coast, Sydney: Reed New Holland.
  9. Hamer, P, Conron, S, Hirst, A and Kemp, J 2016, Sand Flathead Stock Assessment 2015, Fisheries Victoria Science Report Series No. 13, Fisheries Victoria, Queenscliff.
  10. Hamer, P, Kemp, J and Kent, J 2010, Analysis of existing data on sand flathead larval and juvenile recruitment in Port Phillip Bay, Fisheries Victoria Research Report Series No. 50.
  11. Henry, GW and Lyle, JM 2003, The National Recreational and Indigenous Fishing Survey, Fisheries Research and Development Corporation project 99/158, Australian Government Department of Agriculture, Fisheries and Forestry, Canberra.
  12. Hirst, A, Rees, C, Hamer, PA, Kemp, JE and Conron, SD 2014, The decline of Sand Flathead stocks in Port Phillip Bay: magnitude, causes and future prospects, Recreational Fishing Grant Program Research Report, Fisheries Victoria, Queenscliff.
  13. Jordan, AR 1998, The life‐history ecology of Platycephalus bassensis and Nemadactylus macropterus. PhD thesis, University of Tasmania.
  14. Koopman, M, Morison, AK and Troynikov, V 2004, Population dynamics and assessment of sand and rock flathead in Victorian waters, Final Report, Fisheries Research and Development Corporation project 2000/120, Primary Industries Research Victoria, Department of Primary Industries, Queenscliff.
  15. Koopman, MT, Morrison, AK and Coutin, PC (eds) 2009, Sand Flathead 2000, Fisheries Victoria internal report 10, Victorian Department of Primary Industries, Queenscliff.
  16. Krueck N, Hartmann, K and Lyle J 2020, Tasmanian Scalefish Fishery Assessment 2018/19. Institute for Marine and Antarctic Studies, University of Tasmania.
  17. Lyle, JM, Stark, KE, Ewing, GP and Tracey, SR 2019, 2017-18 Survey of recreational fishing in Tasmania. Institute for Marine and Antarctic Studies, Hobart, Tasmania.
  18. MacDonald, CM and Hall, DN 1987, A survey of recreational fishing in Port Phillip Bay, Victoria, Marine Fisheries Report No. 11, Department of Conservation Forests and Lands.
  19. Ryan, KL, Morison, AK and Conron, S 2009, Evaluating methods of obtaining total catch estimates for individual Victorian bay and inlet recreational fisheries, Final report, FRDC project 2003/047.
  20. Southern Sand Flathead–Port Phillip Bay stock status indicators update 2018.
  21. Steer, MA, Fowler, AJ, Rogers, PJ, Bailleul, F, Earl, J, Matthews, C, Drew, M, and Tsolos, A 2020, Assessment of the South Australian Marine Scalefish Fishery in 2018, Report to PIRSA Fisheries and Aquaculture. South Australian Research and Development Institute (Aquatic Sciences), Adelaide. SARDI Publication No. F2017/000427-3. SARDI Research Report Series No. 1049. 213pp.
  22. Victorian Fisheries Authority 2020, Review of key Victorian fish stocks — 2019. VFA Internal Report Series, May 2020.
  23. Victorian Fisheries Authority, 2017, Review of key Victorian fish stocks—2017, Victorian Fisheries Authority Science Report Series No. 1.

Downloadable reports

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