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Eastern King Prawn (2018)

Melicertus plebejus

  • Andrew Prosser (Department of Agriculture and Fisheries, Queensland)
  • Matthew Taylor (Department of Primary Industries, New South Wales)
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Summary

Eastern King Prawns is a sustainable species with a single connected stock along Australia’s eastern coastline.

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Stock Status Overview

Stock status determination
Jurisdiction Stock Fisheries Stock status Indicators
Queensland, New South Wales Eastern Australia ECOTF, OTF Sustainable Biomass; catch, effort and CPUE relative to MSY reference points; fishery-independent index of recruit abundance
ECOTF
East Coast Otter Trawl Fishery (QLD)
OTF
Ocean Trawl Fishery (NSW)
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Stock Structure

Eastern King Prawn (Melicertus plebejus) is endemic to Australia. It occurs on the eastern Australian coast between Hayman Island in Queensland and north-eastern Tasmania (20–42°S) and exhibits strong stock connectivity throughout its range [Montgomery 1990]. Undertaking northward migrations into deeper water as they grow, Eastern King Prawn utilise the East Australian Current to disperse larvae southward after spawning in offshore areas [Montgomery 1990]. Eastern King Prawn are harvested in Queensland and New South Wales fisheries and are considered a single multi-jurisdictional biological stock [Courtney et al. 2014, Montgomery 1990]. There are two contiguous management units for the stock: one from 22–28°S in Queensland, and another along the whole New South Wales coast (28–37.5°S). A comprehensive stock assessment of the Eastern Australia biological stock was completed in 2014 [Courtney et al. 2014, O’Neill et al. 2014].

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

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Stock Status

Eastern Australia

The most recent assessment [Courtney et al. 2014] estimates that biomass in 2010 was 60–80 per cent of the unfished 1958 levels. The stock is not considered to be recruitment impaired. Maximum sustainable yield (MSY) was estimated at 3 100 tonnes (t) (95 per cent confidence interval 2454–3612 t) [O’Neill et al. 2014]. The 2017 catch was 3 533 t (2906 t in Queensland, 627 t in New South Wales), which is above the estimate of MSY but within the range of the estimate. The average catch in 2015–17 was 3108 t, which is slightly above the estimate of MSY. The most recent stock assessment developed minimum monthly catch rate reference points that show levels of biomass that would sustain catches of MSY in each fishery region [Courtney et al. 2014]. For the Queensland component of the stock, standardised monthly regional catch rates were mostly above MSY catch rate reference points for 2016 and 2017 fishing years [QDAF 2018], indicating the level of biomass was sufficient to sustain catches at MSY. Catch rates exceeded MSY catch rate reference points in all New South Wales regions for the majority of the 2016 and 2017 fishing years [QDAF 2018]. Fishery-independent surveys of recruit abundance in Queensland show variable recruitment to the fishery with no discernible trend over 10 years. Indices of recruit abundance display peaks in 2009 and 2013. The above evidence indicates that the biomass of the stock is unlikely to be recruitment impaired.

The most recent assessment [Courtney et al. 2014] estimates future effort (E) at MSY (EMSY), standardised to the number of boat-days in 2010, as 38 002 boat-days (95 per cent confidence interval 27 035–50 754 boat-days) assuming no further increase in fishing power. An alternative estimate of 28 300 boat-days (95 per cent confidence interval 20 110–37 663 boat-days) accounts for a three per cent per year increase in fishing power over the next decade from 2010 levels [O’Neill et al. 2014]. Effort in 2017 was 20 006 boat-days (15 064 boat-days in Queensland [QDAF 2018]; 4 942 boat-days in New South Wales [NSW DPI 2018]), which was well below both estimates of EMSY and the peak effort of around 50 000 boat-days in 2003, but similar to levels in 2015. This level of fishing pressure is unlikely to cause the stock to become recruitment impaired. The decline in effort since 2000 has been offset by increases in fishing power [Braccini et al. 2012]. The number of boats accessing the fishery has remained stable in Queensland since 2012 but has continued to decline in New South Wales. The above evidence indicates 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 Eastern Australia biological stock is classified as a sustainable stock.

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Biology

Eastern King Prawn biology [Courtney et al. 1995, Courtney et al. 1996, Lloyd-Jones et al. 2012]

Biology
Species Longevity / Maximum Size Maturity (50 per cent)
Eastern King Prawn < 3 years, Males 52 mm CL, Females 73 mm CL Females 42 mm CL
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Distributions

Eastern King Prawn biology [Courtney et al. 1995, Courtney et al. 1996, Lloyd-Jones et al. 2012]

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Tables

Fishing methods
Queensland New South Wales
Commercial
Otter Trawl
Unspecified
Indigenous
Coastal, Estuary and River Set Nets
Recreational
Coastal, Estuary and River Set Nets
Management methods
Method Queensland New South Wales
Charter
Possession limit
Commercial
Effort limits
Gear restrictions
Limited entry
Spatial closures
Temporal closures
Vessel restrictions
Indigenous
Bag limits
Native Title
Section 37 (1d)(3)(9), Aboriginal cultural fishing authority
Recreational
Bag limits
Possession limit
Recreational fishing licence
Active vessels
Queensland New South Wales
175 in ECOTF 42 in EGF, 22 in EPTF, 74 in OTF
ECOTF
East Coast Otter Trawl Fishery (QLD)
EGF
Estuary General Fishery (NSW)
EPTF
Estuary Prawn Trawl Fishery (NSW)
OTF
Ocean Trawl Fishery (NSW)
Catch
Queensland New South Wales
Commercial 2.91Kt in ECOTF 620.35t in OTF
Indigenous Unknown Unknown
Recreational Unknown <110 t (2008–09)
ECOTF
East Coast Otter Trawl Fishery (QLD)
OTF
Ocean Trawl Fishery (NSW)

Commercial (Catch) The 2017 fishing season for both jurisdictions is 1 November 2016 to 31 October 2017.

New South Wales – Indigenous (Management Methods) (a) Bag limits – The Aboriginal Cultural Fishing Interim Access Arrangement allows an Indigenous fisher in New South Wales to take in excess of a recreational bag limit in certain circumstances—for example, if they are doing so to provide fish to other community members who cannot harvest themselves; (b) Section 37 (1d)(3)(9), Aboriginal cultural fishing authority – 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 (c) Native Title – 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.

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Catch Chart

Commercial catch of Eastern King Prawn - note confidential catch not shown

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References

  1. Braccini, JM, O'Neill, MF, Campbell, AB, Leigh, GM and Courtney, AJ 2012, Fishing power and standardized catch rates: implications of missing vessel-characteristic data from the Australian eastern king prawn (Melicertus plebejus) fishery, Canadian journal of fisheries and aquatic sciences, 69: 797–809.
  2. Courtney, AJ, Die, DJ, and McGilvray, JG 1996, Lunar periodicity in catch rate and reproductive condition of adult eastern king prawns, Penaeus plebejus, in coastal waters of south-eastern Queensland, Australia, Marine and Freshwater Research, 47: 67–76.
  3. Courtney, AJ, Montgomery, SS, Die, DJ, Andrew, NL, Cosgrove, MG and Blount, C 1995, Maturation in the female eastern king prawn Penaeus plebejus from coastal waters of eastern Australia, and considerations for quantifying egg production in penaeid prawns, Marine Biology, 122: 547–556.
  4. Courtney, AJ, O'Neill, MF, Braccini, M, Leigh, GM, Kienzle, M, Pascoe, S, Prosser, AJ, Wang, Y-G, Lloyd-Jones, L, Campbell, AB, Ives, M, Montgomery, SS and Gorring, J 2014, Biological and economic management strategy evaluations of the eastern king prawn fishery, FRDC project 2008/019 final report, Department of Agriculture, Fisheries and Forestry, Queensland.
  5. Lloyd-Jones, LR, Wang, Y-G, Courtney, AJ, Prosser, AJ and Montgomery, SS 2012, Latitudinal and seasonal effects on growth of the Australian eastern king prawn (Melicertus plebejus), Canadian Journal of Fisheries and Aquatic Sciences, 69: 1525–1538.
  6. Montgomery, SS 1990, Movements of juvenile eastern king prawns, Penaeus plebejus, and identification of stock along the east coast of Australia, Fisheries Research, 9: 189–208.
  7. NSWDPI Unpublished. Status of Australian Fish Stocks 2018 – NSW Stock status summary – Eastern King Prawn (Melicertus plebejus)
  8. O’Neill, MF, Leigh, GM, Wang, Y-G, Braccini, JM, and Ives, MC 2014, Linking spatial stock dynamics and economics: evaluation of indicators and fishery management for the travelling eastern king prawn (Melicertus plebejus), ICES Journal of Marine Science, 71(7): 1818–1834.
  9. Queensland Department of Agriculture and Fisheries 2018, Queensland Stock Status Assessment Workshop Proceedings 2018. Species Summaries. 19–20 June 2018, Brisbane.

Archived reports

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