Ocean Jacket (2020)
Date Published: June 2021
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Ocean Jackets are found along the southern half of Australia, with sustainable stocks in NSW, SA and Commonwealth waters. Stocks in VIC are undefined, with limited information available. Stocks are negligible in TAS.
Stock Status Overview
|New South Wales||New South Wales||Sustainable||Catch, effort, CPUE|
Ocean Jackets are distributed along the southern half of Australia from Cape Moreton in Queensland around to North West Cape in Western Australia, including northern Tasmania [Kailola et al 1993]. Throughout their distribution, Ocean Jackets are found in many habitats. As juveniles they are found in estuaries and sheltered bays amongst seagrass beds of Zostera sp. and Posidonia sp. [Grove-Jones and Burnell 1991, Jones and West 2005]. Sub-adults and adults are found in different habitats such as rocky reefs, sandy–mud benthos, or sponge–coralline algae gardens in waters from 2–250 m [Grove-Jones and Burnell 1991, Hutchins 1999], where they are known to aggregate seasonally in large schools.
Little is known about the biological structure of the Ocean Jacket stock. Here, assessment of stock status is presented at the management unit level—Southeast Scalefish and Shark Fishery, Great Australian Bight Trawl Sector (Commonwealth); and at the jurisdictional level—New South Wales, Victoria, Tasmania and South Australia.
New South Wales
In New South Wales, Ocean Jackets have a long history of commercial exploitation using oceanic demersal fish traps and demersal otter trawl. Records of reported landings indicate that substantial peaks of between 600 and 900 tonnes (t) per year occurred during the 1920s and again during the 1950s. These peaks were followed by large declines, which suggest that this species is vulnerable to over-exploitation. Between 2000–01 to 2006–07, annual commercial landings using oceanic demersal fish traps and demersal otter trawl increased from 134 to 430 t. Since then, catch has been relatively stable, peaking in 2012 at 420 t and declining to 235 t in 2018–19. Since 2009–10 there has been no trend in median trap CPUE, though it peaked in 2013–14 and has slightly declined since then, but to similar levels experienced a decade ago.
Ocean Jackets are important to New South Wales recreational and charter boat fishers. The most recent estimate of the recreational harvest of Leather Jackets (all species combined) in New South Wales, based on a survey of Recreational Fishing Licence (RFL) Households, was approximately 53 062 fish weighing approximately 22.8 t caught during 2017–18 with 83 per cent landed using line-bait [Murphy et al. 2020]. RFL households comprised at least one member who possessed a long-term (1 and 3 years duration) fishing licence and included other fishers resident within their households. Recreational fishing estimates from 2017–18 are down from the previous estimates of 71 000 and 246 212 fish during 2013–14 and 2000–01, respectively [West et al. 2015]. The decrease in commercial and recreational catches, coupled with the boom-bust history of the fishery, may indicate that the biomass is declining. However, the above evidence indicates that the biomass of this stock is unlikely to be depleted and that recruitment is unlikely to be impaired.
Miller and Stewart  reported that between 2003 and 2005, Ocean Jacket in New South Wales landings ranged between 220 and 650 mm TL and were fully recruited to the fishery at two years of age, with most of the catch (83 per cent) aged either two or three years. The instantaneous total mortality rate was estimated from an age-based catch curve as 1.1. Natural mortality was estimated at approximately 0.5, based on a maximum age of six years. Since then, there have been declines in commercial effort, from 6 000–7 000 days fished down to 2 000–3 000 days fished. Further, recreational fishing effort has declined by 37 per cent in ocean waters (inshore and offshore; [West et al. 2015]). The above evidence indicates that the current level of fishing mortality in New South Wales is unlikely to cause the stock to become recruitment impaired.
Based on the evidence presented above, Ocean Jacket in New South Wales is classified as a sustainable stock.
Ocean Jacket biology [Kailola et al. 1993, Miller et al. 2010, Miller and Stewart 2012]
|Species||Longevity / Maximum Size||Maturity (50 per cent)|
|Ocean Jacket||≥ 9 years, 790 mm FL New South Wales 6 years, 656 mm TL||New South Wales 2.5 years|
|New South Wales|
|Traps and Pots|
|Hook and Line|
|Hook and Line|
|Method||New South Wales|
|Fishing gear and method restrictions|
|Customary fishing management arrangements|
|New South Wales|
|Recreational||53 062 fish during 2017–18|
Commonwealth – Commercial (Management Methods/Catch) Data provided for the Commonwealth align with the Commonwealth Southern and Eastern Scalefish and Shark Fishery for the 2018-19 financial year.
Commonwealth – Recreational The Commonwealth does not manage recreational fishing in Commonwealth waters. Recreational fishing in Commonwealth waters is managed by the state or territory immediately adjacent to those waters, under its management regulations.
Commonwealth – Indigenous The Australian government does not manage non-commercial Indigenous fishing in Commonwealth waters, with the exception of Torres Strait. In general, non-commercial Indigenous fishing in Commonwealth waters is managed by the state or territory immediately adjacent to those waters.
New South Wales – Indigenous (Management Methods) https://www.dpi.nsw.gov.au/fishing/aboriginal-fishing
New South Wales – Recreational (Catch) Murphy et al. .
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.
- AFMA 2019, Harvest strategy framework for the Southern and Eastern Scalefish and Shark Fishery 2009 (amended 2019), Australian Fisheries Management Authority, Canberra.
- Burch, P, Althaus, F & Thomson, R 2019, Southern and Eastern Scalefish and Shark Fishery (SESSF) catches and discards for TAC purposes using data until 2018, Prepared for the SERAG Meeting, 3-4 December 2019, Hobart, CSIRO Oceans and Atmosphere, Hobart, Tasmania.
- Grove-Jones RP, Burnell AF 1991, Fisheries biology of the Ocean Jacket (Monacanthidae: Nelusetta ayraudi) in the eastern waters of the Great Australian Bight. South Australian Department of Fisheries. FIRDC Project DFS01Z, Final report 107 pp.
- Hutchins, BJ 1999. Leatherjackets. In Andrew, NL Under southern Seas. The ecology of Australia’s rocky reefs. University of New South Wales Press Ltd, Sydney. pp 195–202.
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- Jones, MV and West, RJ, 2005, Spatial and temporal variability of seagrass fishes in intermittently closed and open coastal lakes in southeastern Australia. Estuarine, Coastal and Shelf Science, 64, 2–3, 277–288.
- Kailola PJ, Williams MJ, Stewart PC, Reichelt RE, McNee A and Grieve C, 1993, Australian Fisheries Resources. Australian Bureau of Resource Sciences and the Fisheries Research and Development Corporation. Canberra.
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- Krueck N, Hartmann, K and Lyle J 2020, Tasmanian Scalefish Fishery Assessment 2018/19. Institute for Marine and Antarctic Studies, University of Tasmania.
- Miller, ME and Stewart, J 2009, The commercial fishery for ocean leatherjackets (Nelusetta ayraudi, Monacanthidae) in New South Wales, Australia, Asian Fisheries Science, 22: 257–264.
- Miller, ME and Stewart, J 2012, Reproductive characteristics of the ocean leatherjacket, Nelusetta ayraudi. Reviews of Fish Biology and Fisheries.
- Miller, ME, Stewart, J and West, RJ 2010, Using otoliths to estimate age and growth of a large Australian endemic monocanthid, Nelusetta ayraudi (Quoy and Gaimard, 1824). Environmental Bioliology of Fishes, 88: 263–271
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- Murphy, J.J., Ochwada-Doyle, F.A., West, L.D., Stark, K.E. and Hughes, J.M., 2020, The NSW Recreational Fisheries Monitoring Program - survey of recreational fishing, 2017/18. NSW DPI - Fisheries Final Report Series No. 158.
- Sporcic M and Haddon, M, 2018, Statistical CPUE Standardizations for selected SESSF species (data to 2017). CSIRO Oceans and Atmosphere, Hobart.
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- West, LD, Stark, KE, Murphy, JJ, Lyle, JM and Ochwada-Doyle, FA 2015, Survey of Recreational Fishing in New South Wales and the ACT, 2013/14. NSW DPI – Fisheries Final Report Series No. 149.