*

Pipi are common on sandy beaches from southern QLD to the mouth of the Murray River in SA. Pipis have been harvested by Indigenous people for 10,000 years. Pipi is a sustainable stock in SA and NSW, and undefined stock in VIC.

Pipi is common on high-energy sandy beaches from southern Queensland to the mouth of the Murray River in South Australia [Murray-Jones and Ayre 1997] 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 and South Australian Currents acting as key drivers of gene flow on the east and south coasts of Australia respectively [Miller et al. 2013]. 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 Current [Murray-Jones and Ayre 1997]. For locations west of Bass Strait in South Australia and western Victoria, no evidence of genetic structuring has been detected [Miller et al. 2013]. The degree of larval mixing is thought to be related to spawning and larval duration, although these are poorly understood [King 1976, Ferguson 2013; Gluis and Li 2014; Miller et al. 2013]. 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 beaches [Murray-Jones and Ayre 1997]. 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.

New South Wales

The harvest of Pipi in New South Wales is shared between the commercial sector, recreational fishers and for at least 10,000 years Pipi have provided a source of food for Indigenous people in this region [Murray-Jones 1999]. Steeply declining commercial catches over a six-year period (568 tonnes (t) in 2004–05 to 9 t in 2010–11) suggested that New South Wales Pipi stocks were depleted. Input controls were implemented which aimed to stabilise catches. These included: (1) spatial closures (i.e. within-beach closures), (2) temporal closures of the commercial fishery (i.e. 6 months per year), and (3) a minimum legal size limit (i.e. 45 mm total length) to allow spawning to occur at least once before recruitment to the fishery [Murray-Jones 1999], as well as a daily catch limit of 40 kg per fisher. Annually, harvest is reported from a small proportion (< 20%) of the total number of beaches from which harvest is permitted. From 2010–11 to 2015–16, catches increased from 9 t to 176 t (26% of historical peak), likely resulting from these management measures. Reported commercial landings in 2021–22 declined to 78.7 t.

The primary indicators for biomass and fishing mortality are commercial catch and standardised commercial catch rate. Standardised commercial catch rate (in mean catch per unit effort (CPUE kg per hour) is likely to be the most reliable index of relative abundance for Pipi in NSW. Generalised linear models (GLM) provided estimates of standardised mean catch rates, corrected for differences among fishing years, months, management regions, individual fishing operations, and their transformed fishing effort. Mean daily catch rates (2009–10 to 2021–22), for all regions combined have remained stable, and above average from 2012–13 to 2020–21 [Johnson 2023].

Statewide catches and catch rates have generally increased since 2010–11. For the three main regions of the fishery (Region 1, adjacent to the Queensland border and Regions 3 and 4, located to the south), annual catches have increased, and annual catch rate has been stable since 2010–11. In each of these regions, from 2012–13 to 2018–19, monthly catch rate has generally remained stable across the six-month fishing season. For the years in which simple stock depletion models were applied (i.e. when within-season declines in catch rate occurred, estimated exploitation rates in Region 1 and Region 4 were less than 30% [Johnson 2023]. In Region 3, which includes the greatest number of accessible beaches and highest number of endorsed fishers, within-season exploitation rates ranged from 28–73% [Johnson 2023]. For individual beaches, estimates of exploitation rate from 2009–10 to 2021–22 ranged between 20 and 83%. In 2018, reported landings of 73.2 t from Stockton Beach were estimated to remove 40–46% of the biomass of Pipis (45 mm or larger) during the fishing season (June - December). For the most recent fishing period (2021–22), estimates of exploitation rate on individual beaches ranged from 20–53% [Johnson 2023].

Using the length composition of commercial catches estimates of the size of selectivity (SL50 approximately 51 mm) relative to the size of maturity (L50 approximately 34 mm) indicates that a high level of spawning potential of the Pipi stock is protected from fishing mortality [Johnson 2023]. Despite estimates of relative fishing mortality (F/M) from length-based spawning potential ratio analyses [Hordyk et al. 2015, 2016] being high (2.7–4.2), moderate levels of spawning potential ratio (0.43–0.45) are being conserved [Johnson 2023].

Estimates of state-wide recreational catches are available from the National Recreational and Indigenous Fishing Survey and New South Wales state-wide surveys completed in 2000–01 [Henry and Lyle 2003], 2013–14 [West et al. 2015] and 2017–18 [Murphy et al. 2020] financial years. The estimated recreational catch in 2000–01 was 7 t, and in 2017–18 was 1.1 t, representing less than 1% of the combined recreational and commercial harvest in each survey period. Although Indigenous fishers harvest Pipi throughout New South Wales, there are no state-wide estimates of Indigenous harvest. Onsite interviews of Indigenous fishers in the Tweed Heads region (Northern New South Wales) estimated an annual Pipi harvest in that region of 3 056–7 380 individuals [Schnierer 2011]. Using a regional weight multiplier estimated at 14.81 g per Pipi (Murphy et al. 2020), Indigenous harvest was estimated to be less than 0.12 t. 

The above evidence indicates that the biomass of this stock is unlikely to be depleted and that recruitment is unlikely to be impaired. Furthermore, 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, Pipi in NSW is classified as a sustainable stock.

Pipi biology [King 1976; Murray-Jones 1999; Ferguson 2013; Ferguson et al. 2021]

Distribution of reported commercial catch of Pipi

Active Vessels.  Pipi are collected from beaches and ‘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.

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.

New South Wales – Indigenous (Management Methods). (https://www.dpi.nsw.gov.au/fishing/aboriginal-fishing

New South Wales – Recreational (Catch). Murphy et al. [2022].

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.

South Australia – Indigenous (Management Methods). In South Australia, regulations for managing recreational fishing may not apply to fishing activities by Indigenous people. South Australian traditional owners may have rights under the Commonwealth's Native Title Act 1993 to hunt, fish, gather and conduct other cultural activities for their personal, domestic or non-commercial communal needs without the need to obtain a licence.

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.

Commercial catch of Pipi - note confidential catch not shown

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