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Stock Status Overview
|South Australia||South Australia||LCF, MSF||Sustainable||Fishery-independent relative abundance, size frequencies|
- Lakes and Coorong Fishey (SA)
- Marine Scalefish Fishery (SA)
Pipi is common on high-energy sandy beaches from southern Queensland to the mouth of the Murray River in South Australia1 and the distribution may extend further westwards. High genetic variation between populations on either side of Bass Strait indicates at least two biological stocks, with the East Australian Current and South Australian Current acting as key drivers of gene flow on the east and south coasts of Australia respectively2. A study of Pipi from Fraser Island, Queensland, to southern New South Wales, indicated a single biological stock over this area, with genetic mixing driven by ocean currents associated with the East Australian Current1. For locations west of Bass Strait in South Australia and western Victoria, no evidence of genetic structuring of Pipi has been detected2. The degree of larval mixing is thought to be related to spawning and larval duration, although these are poorly understood2–5. Although no genetic differences were detected among Pipi populations on beaches along the east coast of Australia, in any given year most recruits are likely to be self-seeded or to come from nearby, adjacent beaches1. This is also likely the case for the fisheries located to the west of Bass Strait. Despite the work outlined above, the biological stock delineation of Pipi remains unclear.
Here, assessment of stock status is presented at the jurisdictional level—New South Wales, Victoria, and South Australia.
Indigenous Australians have occupied the Coorong region in south-eastern South Australia for at least 16 000 years and have harvested Pipi (also known as Goolwa Cockles in South Australia) for the past 10 000 years10. Middens in the vicinity of the Murray River mouth in South Australia are composed almost exclusively of the shells of adult Pipi12.
The commercial fishery for Pipi has been managed under an annual total allowable commercial catch (TACC) since the 2007–08 financial year. Fishers with quota for Pipi from the Lakes and Coorong Fishery (LCF) and the Marine Scalefish Fishery (MSF) operate mainly on the ocean beaches of Younghusband Peninsula, adjacent to the Coorong. Quota holders from the MSF are subject to the same management arrangements (including the annual TACC) as the LCF. Since 2012, the TACC has been determined under the harvest strategy for Pipi, which is described in the Management Plan for the Lakes and Coorong Fishery13. The harvest strategy uses two biological performance indicators and one economic performance indicator with associated decision rules to recommend a TACC for the following year13.
The primary biological performance indicator is based on fishery-independent estimates of mean annual relative biomass14. In 2006–07, prior to development of the harvest strategy, fishery-dependent information indicated that the Pipi resource had become depleted during the mid to late 2000s3,14,15. From the 2009–10 financial year, increasing mean annual relative biomass and increasing complexity of size structures indicate recovery of the resource, following the implementation of conservative TACCs since 2009–103,14. The relative biomass in 2014–15 was six per cent above the previous 5-year average (2010–11 to 2013–14). The above evidence indicates that the biomass of this stock is unlikely to be recruitment overfished.
Estimates of recreational catch are available from telephone-based surveys in 2000–0116 and 2007–0817. In 2000–01, the estimated recreational catch was 22.9 t, representing 1.8 per cent of the total recreational and commercial catch, and in 2007–08 it was 5 t, representing 0.8 per cent of the total recreational and commercial catch16,17. In 2013–14, revised methodology, including an on-site survey specific to the Pipi fishery, provided an estimated recreational catch of 33 t, comprising seven per cent of the combined recreational and commercial catch18. The recreational and commercial Pipi fisheries are spatially separated and small catches from the recreational fishery are unlikely to affect the overall status in South Australia. A minimum legal length of 35 mm is in place to allow spawning to occur at least once before recruitment to the fishery3. The above evidence indicates that the current level of fishing pressure is unlikely to cause the stock to become recruitment overfished.
On the basis of the evidence provided above, Pipi in South Australia is classified as a sustainable stock.
|Species||Longevity / Maximum Size||Maturity (50 per cent)|
|Pipi||South Australia: 3–5 years; 61 mm SL New South Wales: 1–2 years; 75 mm SL||South Australia: ~10 months; 28 mm SL New South Wales: 1 year, 37 mm SL|
Distribution of reported commercial catch of Pipi
|15 in LCF, 2 in MSF|
- Lakes and Coorong Fishey (SA)
- Marine Scalefish Fishery (SA)
|Commercial||443.11t in LCF|
|Recreational||22.9 t (in 2000), 5 t (in 2007), 33 t (in 2013)|
- Lakes and Coorong Fishey (SA)
a Victoria - Indigenous In Victoria, regulations for managing recreational fishing are also applied to fishing activities by Indigenous people. Recognised Traditional Owners (groups that hold native title or have agreements under the Traditional Owner Settlement Act 2010 [Vic]) are exempt (subject to conditions) from the requirement to hold a recreational fishing licence, and can apply for permits under the Fisheries Act 1995 (Vic) that authorise customary fishing (for example, different catch and size limits, or equipment). The Indigenous category in Table 3 refers to customary fishing undertaken by recognised Traditional Owners. In 2014–15, there were no applications for customary fishing permits to access Pipi.
b New South Wales - Indigenous 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.
c New South Wales - Indigenous Aboriginal cultural fishing authority - the authority that Indigenous persons can apply to take catches outside the recreational limits under the Fisheries Management Act 1994 (NSW), section 37(1)(c1) Aboriginal cultural fishing authority.
d Active Vessels Because Pipi is collected from beaches, ‘vessels’ are not used. Hence, numbers of licences and fishers are presented here instead of vessel numbers. Licences refer to the number of licence holders with an endorsement to take Pipi for sale.
e South Australia and Victoria - Commercial (catch) Catches from the MSF in South Australia, and the BF and OF in Victoria cannot be reported separately for confidentiality reasons as there are fewer than five licences.
Commercial catch of Pipi
Effects of fishing on the marine environment
- Since commercial and recreational fishers collect Pipi either by hand or using hand rakes, the fishery has limited physical impact on the environment, although the impacts of on-beach mechanical grading are unknown. Pipi are a food source for Pied Oystercatchers (Haematopus longirostris) in New South Wales and South Australia, with high Pipi densities related to higher densities of Pied Oystercatchers19,20. Relatively high levels of recreational and commercial vehicle traffic (more than 20 vehicles per day) have been identified as having the potential to affect populations of Pipi on sandy beaches on the eastern Australian coast21. In South Australia, relatively low levels of vehicle traffic (fewer than 10 vehicles per day, including commercial vehicles) occur on Younghusband Peninsula where the commercial fishery is located. Higher levels of vehicle traffic may occur on the Sir Richard Peninsula where the recreational fishery is located20.
Environmental effects on Pipi
- Populations of Pipi are known to display large natural fluctuations in abundance due to high spatial and temporal variability in recruitment and mortality14,22. Climatic and oceanographic conditions experienced by populations of Pipi on the eastern and southern Australian coastlines are likely to differ greatly, so that spatial and temporal fluctuations in abundance, and the underlying mechanisms driving these fluctuations, also differ. Additionally, habitat supporting Pipi fisheries in New South Wales comprises a large number of discrete beaches (more than 100) compared to a smaller number of beaches in Victoria and one large beach (more than 60 km) in South Australia.
- Mortality events have been recorded for populations of Pipi. For example, in 1984, an estimated 2.5 million, mostly adult Pipi were found dead on Goolwa Beach, west of the mouth of the Murray River23. It was postulated that an extended period of low salinity following flooding from the Murray River may have resulted in mortality due to osmotic stress or starvation23,24.
- During the peak spawning season (September–October), the prevailing currents in south-eastern South Australia flow in a north-westerly direction4. Because larvae may remain in the plankton for at least 14 days after spawning4,5 changes to the nearshore currents during the spawning period may impact recruitment to the beach.
Murray-Jones SE and Ayre, DJ 1997, High levels of gene flow in the surf bivalve Donax deltoides (Bivalvia: Donacidae) on the east coast of Australia, Marine Biology, 1(128): 83–89. DOI: 10.1007/s002270050071.
Miller, AD, Versace, VL, Matthews, TG, Montgomery, S and Bowie, KC 2013, Ocean currents influence the genetic structure of an intertidal mollusc in southeastern Australia—implications for predicting the movement of passive dispersers across a marine biogeographic barrier, Ecology and Evolution, 3(5): 1248–1261. DOI: 10.1002/ece3.535.
Ferguson, GJ 2013, Pipi (Donax deltoides) Stock Assessment, report for Primary Industries and Regions South Australia Fisheries and Aquaculture, publication F2007/000550-1, South Australian Research and Development Institute, Adelaide.
- 4 King, MG 1976, The life-history of the Goolwa Cockle, Donax (Plebidonax) deltoides, (Bivalvia: Donacidae), on an ocean beach, South Australia, South Australian Department of Agriculture and Fisheries, Adelaide.
Gluis, M and Li, X 2014, Developing clam aquaculture in Australia: a feasibility study on culturing Donax deltoides and Katelysia rhytiphora on intertidal and subtidal leases in South Australia. South Australian Research and Development Institute (Aquatic Sciences), FRDC Final Report 2009/208.
Murray-Jones, S 1999, Conservation and management in variable environments: the surf clam, Donax deltoides, PhD thesis, University of Wollongong.
Gray, C 2016, Optimising the collection of relative abundance data for the pipi population in New South Wales. FRDC Project No 2012/018, Wildfish Research, Sydney, Australia.
Henry, GW and Lyle, JM 2003, The national recreational and Indigenous fishing survey, Fisheries Research and Development Corporation, Canberra.
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. Fisheries Final Report Series No. 149. NSW Department of Primary Industries, Wollongong.
Godfrey, MCS 1989, Shell midden chronology in SW Victoria, Archaeology in Oceania, 24: 65–69. DOI: 10.1002/j.1834-4453.1989.tb00213.x.
Lewis, Z, Khageswor, G, Versace, VL and Scarpaci, C 2012, Applying stock indicators for assessment of a recreational surf clam (Donax deltoides) fishery in Victoria, Australia, Journal of the Marine Biological Association of the United Kingdom, 1–7. DOI: .
Luebbers, RA 1978, Meals and menus: a study of change in prehistoric coastal settlements in South Australia, PhD thesis, Australian National University, Canberra.
PIRSA 2016, Management Plan for the South Australian Commercial Lakes and Coorong Fishery. Primary Industries and Regions South Australia (Fisheries and Aquaculture), Adelaide.
Ferguson, G, Ward, TM and Gorman, D 2015, Recovery of a surf clam Donax deltoides population in southern Australia: successful outcomes of fishery-independent surveys. North American Journal of Fisheries Management, 35:1185–1195. DOI:10.1080/02755947.2015.1091408.
Ferguson, G and Mayfield, S 2006, The South Australian Goolwa cockle (Donax deltoides) Fishery, fishery assessment report to Primary Industries and Resources South Australia Fisheries, South Australian Research and Development Institute (Aquatic Sciences), Report RD06/005-1, Adelaide.
- 16 Jones, K and Doonan, AM 2005, 2000–01 national recreational and Indigenous fishing survey: South Australian regional information, South Australian fisheries management series, paper 46, Primary Industries and Resources South Australia, Adelaide.
- 17 Jones, K 2009, South Australian recreational fishing survey 2007/08, South Australian fisheries management series, paper 55, Primary Industries and Resources South Australia, Adelaide.
Giri, K and Hall, K 2015, South Australian recreational fishing survey 2013–14. Fisheries Victoria Internal Report Series No. 62, Victoria.
- 19 Owner, D and Rohweder, DA 2003, Distribution and habitat of Pied Oystercatchers (Haemotopus longirostris) inhabiting ocean beaches in northern New South Wales, Emu, 103:163–169.
Jones, GK 2016, Changes in distribution and abundance of Australian Pied and Sooty Oystercatchers on highly disturbed beaches of the south-eastern Fleurieu Peninsula, South Australia, Stilt, 68:31–39.
Schlacher, TA, Thompson, LMC and Walker, SJ 2008, Mortalities caused by off-road vehicles (ORVs) to a key member of sandy beach assemblages, the surf clam Donax deltoides, Hydrobiologia, 610: 345–350. DOI: 10.1007/s10750-008-9426-9.
- 22 McLachlan, A, Dugan, JE, Defeo, O, Ansell, AD, Hubbard, DM, Jaramillo, E and Penchaszadeh, PE 1996, Beach clam fisheries, Oceanography Marine Biology Annual Review, 34:163–232.
- 23 Clarke, SM 1985, Fish kill—cockles, SAFIC, 9(1): 12.
- 24 King, M 1985, A review of the Goolwa Cockle, SAFIC, 9(5): 14.
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