Ornate Rock Lobster (2018)
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Ornate Rock Lobsters are found in north-eastern Australia, where stock is classified as sustainable. They are also found in northern WA, where stock status is negligible as a result of low catches.
Stock Status Overview
|Northern Territory||North-Eastern Australia||TRLDF||Sustainable||Biomass, fishing mortality|
- Tropical Rock Lobster Developmental Fishery (NT)
Ornate Rock Lobster populations in northern Queensland (managed by Queensland), the Coral Sea (managed by the Commonwealth) and the Torres Strait (managed by the Torres Strait Protected Zone Joint Authority) are thought to comprise a single North-Eastern Australia biological stock, as a result of mixing of larvae in the Coral Sea [Pitcher et al. 2005]. Water movement models in Torres Strait predict that larvae are likely to be transported into the Gulf of Carpentaria [Wolanski et al. 2013], indicating that the north-eastern stock encompasses this region as well. Stock assessments have not been carried out for the complete biological stock, but have been conducted on the various parts of it.
Although Ornate Rock Lobster is also present in northern Western Australia, biological stock structures in this region have not been studied and the relationship with the North-eastern Australian stock is unknown.
Here, assessment of stock status is presented at the biological stock level—North-Eastern Australia; and at the jurisdictional level—Western Australia.
Stock status for the entire Ornate Rock Lobster biological stock has been established using evidence from the Torres Strait, Queensland and Coral Sea parts of the biological stock.
For the Torres Strait part of the biological stock, the most recent assessment [Plagányi et al. 2018] estimated that spawning stock biomass in 2017 was 76 per cent of the unfished (1973) level, which was above the target reference point of 65 per cent of the unfished (1973) level [Plagányi et al. 2018]. This part of the stock is not considered to be recruitment impaired. The model-generated nominal total allowable catch (TAC ) for the 2017 fishing season was 495 tonnes (t), of which 368 t (74 per cent) was caught, equating to a fishing mortality of 0.14, which is lower than the target reference point of 0.15 [Plagányi et al. 2018]. This level of fishing mortality is unlikely to cause this part of the stock to become recruitment impaired.
For the Queensland part of the biological stock, the most recent stock assessment [DEEDI 2011] estimated that biomass at the start of 2008 was 60–70 per cent of the unfished (1988) level. A TAC of 195 t was introduced for the commercial fishery in 2009. The TAC was based on a conservative 80 per cent of the estimated maximum sustainable yield for the Queensland portion of the stock. The commercial catch since 2009 has been below the TAC [QDAF 2018]. Catch rates (kg per day and kg per tender day) in 2017 were within historical limits and have increased since 2015 [QDAF 2018]. Bleaching of coral habitat in the main body of the fishery has been severe in recent years with reported substantial loss of coral cover [AIMS 2018]. It is unclear if this will have longer term impacts on Ornate Rock Lobster productivity. This part of the biological stock is not considered to be recruitment impaired, and this level of fishing mortality is unlikely to cause this stock to become recruitment impaired.
No quantitative stock assessments have been carried out for the Coral Sea part of the biological stock, but there is only limited targeting of Ornate Rock Lobster in this area and catches are very low. Estimates of density on Coral Sea reefs, inferred from fishers’ catch rates, suggest that lobster abundance is likely to be many times higher than would be required to support the total historical catch (less than 10 t) [Chambers 2015]. This part of the stock is not considered to be depleted and recruitment is unlikely to be impaired. Additionally, no commercial catch was recorded in 2017. Therefore, this level of fishing mortality is unlikely to cause this part of the biological stock to become recruitment impaired.
Only small annual catches (less than 200 kg) of Ornate Rock Lobster have been recorded in the Northern Territory under a developmental permit in the Gulf of Carpentaria. However, there has been no activity in this fishery since 2016. Additionally, there have been low reported catches (less than 6 kg) by Fishing Tour Operators but there was no catch recorded by any fishery in 2017. There has never been a targeted fishery for this species in this jurisdiction, and the small catches recorded are highly unlikely to influence the biomass of this stock. Available evidence indicates the biomass of the stock in this region is unlikely to be depleted and recruitment is unlikely to be impaired. The current level of fishing mortality is unlikely to cause recruitment to become impaired.
On the basis of the evidence provided above, the North-Eastern Australia biological stock is classified as a sustainable stock.
Ornate Rock Lobster biology [Kailola et al. 1993, MacFarlane and Moore 1986, Skewes at al. 1997]
|Species||Longevity / Maximum Size||Maturity (50 per cent)|
|Ornate Rock Lobster||3–5+ years, > 150 mm CL||2–3 years, ~100 mm CL|
|Prohibition on take of egg-bearing and tar-spot females|
|Prohibition on take of egg-bearing and tar-spot females|
Commonwealth - Commercial (Catch Totals) Catch data provided for Commonwealth and Queensland align with the 2017 calendar year.
Commonwealth – Recreational (Management Methods) The Australian Government 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 (Management Methods) 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, and Fisheries (Queensland); and the Torres Strait Regional Authority. The PZJA also manages non-Indigenous commercial fishing in the Torres Strait.
Commonwealth - Indigenous (Catch Totals) This specifically refers to non-commercial Indigenous catch. Commercial Indigenous catch in the Torres Strait is included under ‘commercial’
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) In Queensland, under the Fisheries Act 1994, Indigenous fishers are able to use prescribed traditional and non-commercial fishing apparatus in waters open to fishing. Size and possession limits, and seasonal closures do not apply to Indigenous fishers. Further exemptions to fishery regulations may be applied for through permits.
- Australian Institute of Marine Science 2018, Long-term Reef Monitoring Program–Annual summary report in coral reef condition for 2017–18.
- Chambers, M 2015, ‘Status determination for trochus and tropical rock lobster stocks in the Coral Sea Fishery hand collection sector’, in J Larcombe, R Noriega and I Stobutzki (eds), Reducing uncertainty in fisheries stock status, ABARES research report, Canberra.
- Kailola, PJ, Williams, M, Stewart, P, Riechelt, R, McNee, A and Grieve, C 1993, Australian fisheries resources, Bureau of Resource Sciences and Fisheries Research and Development Corporation, Canberra.
- MacFarlane, JW and Moore, R 1986, Reproduction of the ornate rock lobster, Panulirus ornatus (Fabricius), in Papua New Guinea, Marine and Freshwater Research, 37: 55–65.
- Pitcher, CR, Turnbull, CT, Atfield, J, Griffin, D, Dennis, D and Skewes, T 2005, Biology, larval transport modelling and commercial logbook data analysis to support management of the NE Queensland rock lobster Panulirus ornatus fishery, Fisheries Research and Development Corporation project 2002/008, CSIRO Marine Research, Brisbane.
- Plagányi, ÉE, Campbell, R, Tonks, M, Haywood, M, Deng, R, Murphy, N and Salee, K 2018, Torres Strait rock lobster (TRL) 2017 fishery surveys, CPUE and stock assessment, AFMA project 2016/0822, CSIRO Oceans and Atmosphere, Brisbane.
- Queensland Department of Agriculture and Fisheries 2018, Queensland Stock Status Assessment Workshop Proceedings 2018. Species Summaries. 19–20 June
- Queensland Department of Employment, Economic Development and Innovation 2011, Annual status report 2011: Commercial Crayfish and Rocklobster Fishery, Queensland DEEDI, Brisbane.
- Ryan KL, Hall NG, Lai EK, Smallwood CB, Taylor SM, Wise BS 2017. Statewide survey of boatbased recreational fishing in Western Australia 2015/16. Fisheries Research Report No. 287, Department of Primary Industries and Regional Development, Western Australia. 205pp
- Skewes, TD, Pitcher, CR and Dennis, DM 1997, Growth of ornate rock lobsters, Panulirus ornatus, in Torres Strait, Australia, Marine and Freshwater Research, 48: 497–501.
- Wolanski, E, Lambrechts, J, Thomas, C and Deleersnijder, E 2013, The net water circulation through Torres Strait, Continental Shelf Research, 64: 66–74.