Donax Deltoides

''Plebidonax deltoides'' or ''Donax deltoides'' is a small, edible saltwater clam or marine bivalve mollusc, endemic to Australia. It belongs to the family of either the Donacidae, or the related Psammobiidae. It is most widely known as the pipi (also spelled ''pippi'', plural ''pipis'' or ''pippies'') in the eastern states of its native Australia. In South Australia, it is called the Coorong cockle, Goolwa cockle, or Goolwa pipi, for the region where it is most abundant, or by its Ngarrindjeri name, kuti. In south-eastern Queensland, it is often also known as eugarie or (y)ugari, a borrowing from the local Yugambeh and Ugarapul languages.

This species should not be confused with the bivalve ''Paphies australis'' (of the family Mesodesmatidae), endemic to New Zealand and also called "pipi".

Life cycle

''P. deltoides'' is an edible bivalve mollusc primarily found from the Eyre Peninsula to Kingston SE in South Australia and from Tasmania to Fraser Island in Queensland, with Younghusband Peninsula (Coorong Beach) in South Australia the site of the largest stock abundance in Australia, where they make up 85% of the total biomass. The Sir Richard Peninsula (Goolwa Beach) and Younghusband Peninsula sand dunes are composed mainly of ''P. deltoides'' shell sediments that have formed over the last 6,600 years.

''P. deltoides'' live on high-energy beaches, the juveniles in the intertidal zone and the adults in the subtidal zone. They use a strong foot to burrow into the sand to an average depth of and feed by filtering phytoplankton from the water. They mature at around one year of age and live from four to five years, reaching a maximum size of . They are dioecious serial broadcast spawners, with spawning taking place over a long period of time peaking in the spring. Larvae drift as plankton for four to eight weeks in the coastal currents, often travelling large distances. They need heavy surf to live, as the surf concentrates the phytoplankton they feed on and increases the oxygen in the water; after periods of calm weather, they begin to die off.

Taxonomy

''Donax deltoïdes'' was first named and briefly described by Jean-Baptiste Lamarck in 1818. He indicated that the description was based on specimen(s) collected from Kangaroo Island by François Péron.
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In 1930, Tom Iredale proposed three new genera for species that he judged do "not agree with the type of ''Donax'', nor with ''Chion''". These were ''Plebidonax'' (type ''Donax deltoides'' Lamarck), ''Tentidonax'' (''Donax veruinus'' Hedley), and ''Deltachion'' (containing two new species).

''Plebidonax'' has been adopted by some reference works, but has not been widely accepted, with many publications still using ''Donax''. Other sources treat ''Plebidonax'' as a subspecies of ''Donax''. If classified as ''Plebidonax'', it is the only member of its genus.

A study of five genes published in 2017 found that ''P. deltoides'' grouped with the Psammobiidae, not the Donacidae.

South Australia

The Ngarrindjeri people had long used pipi, which they called kuti, as an important source of protein in their diet. Cooked on hot coals or in mud ovens, they were eaten on the beach. Numerous ancient shell middens still in evidence around the Coorong and Goolwa beaches, as well as areas now underwater, attest to this practice. After British colonisation of South Australia and the establishment of the Raukkan (previously Point McLeay) mission in 1859, the Ngarrindjeri were taken off their land and became unable to access their traditional fishing and hunting grounds. Famous Ngarrindjeri author and inventor David Unaipon (who is featured on the Australian $50 note) repeatedly asked a 1913 Royal Commission into the welfare of SA Aboriginal people for a fishing licence, but this was not granted.

From then until the 1990s, pipis were primarily used by Europeans as bait in South Australia, and it was not until Italian immigrants introduced '' vongole'' into restaurants in the 1990s that prices increased to the point of becoming viable for commercial fishing. In 2004, regulations regarding human consumption were included into the ''Fisheries Act 1982'', and 32 licences to harvest unlimited quantities were offered at each. Subsequently, imported Asian clam species have largely replaced ''P. deltoides'' as bait due to the lower cost.

The Cockle Train, the oldest steel-tracked railway in Australia, was built in 1854 from Port Elliot to Goolwa in order to transfer cargo from oceangoing vessels to river boats. The train acquired its name due to its extensive use by colonists to collect pipis from beaches near the mouth of the Murray River. Originally in length the line was extended to Victor Harbor in 1864 and is now a popular tourist attraction

2008: Quotas

During the 2008 season, due to surging demand and decreasing catches, a quota of was introduced to manage the resource and commercial fishing was restricted to the Younghusband Peninsula, from a point east of the centre of the Murray mouth to Kingston, with recreational fishers banned from catching in these areas. However it was found that 11 of the licences, primarily multi-generational local family fishing companies, were allocated only 1% of the quota each, which would fail to cover their overheads, while 10 licences supplying European markets were allocated up to 15% of the quota each. Two groups lobbied Parliament to protect the respective interests: Goolwa Cockle Working Group representing the 10 large quota holders, and the Southern Fisherman's Association representing the small quotas. The South Australian Legislative Council overturned the quotas on 23 June 2008 on the basis of unfairness.

2009 season

The November 2008 to May 2009 season was closed after the fishery dramatically collapsed, with more than 95% of the catch consisting of undersize juveniles. A Parliamentary enquiry is investigating Department of Primary Industries and Resources (PIRSA) for its failure to manage the fishery. An independent organisation, ''The Goolwa Pipi Harvesters Association'' was inaugurated in October 2009 and tasked with ensuring the sustainable development of the ''P. deltoides'' retail and export industry. The initial quota for future seasons was set at 600 tonnes annually, less than 2% of the 2008 quota.

2010 season

In October 2009 the government reduced the commercial quota to 300 tonnes, and delayed the start of the 2010 season until December.Govt moves to protect Goolwa cockles
ABC News 30 October 2009 Previously, recreational fishers had been requested to voluntarily limit their catches to 600 per day; however, a new recreational bag limit of 300 per person was now enforceable by law. During the weekend of 9–10 January, fisheries officials patrolled the Victor Harbor and Goolwa Beaches, inspecting over 1,000 recreational catches. Four fishers were fined for exceeding the bag limit and ten for taking undersized individuals; 15,000 undersized ''P. deltoides'' were returned to the water.

2011 season

Due to a recovery of fishery stocks, the State Government increased the commercial quota from 300 to 330 tonnes for the 2011 season, the start of which was voluntarily delayed until 1 December 2010. Recreational fishers are now permitted to collect on the Younghusband Peninsula between 28 Mile Beach and Kingston jetty. Commercial fishers who do not have a quota may take ''P. deltoides'' for their own personal use as bait with a catch limit of per day. It is illegal for commercial fishers without quotas to sell or trade ''P. deltoides''. The size limit was not increased but will instead be reviewed annually, and the Goolwa cockle was officially renamed ''pipi'' by PIRSA.

2012 season

For the 2012 season, the state government increased the commercial quota from 330 to 400 tonnes and announced its intention to proclaim a section of the Younghusband Peninsula a marine sanctuary to provide some protection for future stocks. In reply, commercial fishers announced they planned to lobby the government to either provide compensation or move the sanctuary to a location that would have a lower impact on commercial fishing.

2020: Kuti Co.

After the popularity of the pipi had surged in the preceding five years, a new partnership between Indigenous enterprise Kuti Co. and the highly successful Goolwa Pipi Co., which had established a processing facility at Port Elliott. The partnership deal was struck soon after the Goolwa Pipi Co. had taken over the lease of a beach café at Goolwa, renamed Kuti Shack. The new arrangement will see dozens of Ngarrindjeri workers employed at various stages of production, helping to bring cultural pride and understanding of their heritage.

Victoria

Pipis were taken commercially from South Gippsland beaches in "massive quantities" until depletion of stocks in the 1970s reduced the fishery to recreational fishers. Recreational fishers were limited to five litres a person per day until this was reduced to two litres in 2009 due to concern over family groups collecting far in excess of regulations. Recreational fishers must have a fishing licence and are prohibited from using tools; pipis must be dug up using hands or feet only.

New South Wales

A small commercial fishery with no size or catch limit has existed since the 1950s, harvesting from 100 to 450 tonnes per year in the 1990s, although this tonnage declined from 1998 due to contamination from algae biotoxins. Commercial harvesting in New South Wales is by hand, with 99% of the commercial catch being taken north of Sydney, half from Stockton Beach. To share the resource and to minimise harvesting for sale on the black market, recreational fishers were allowed a bag limit of 50 pipis per day, which are by law only to be used for bait because of a number of biotoxin poisoning cases. According to a 1999 survey, recreational fishers were estimated to take around 45 tonnes per year, 92% for consumption and 8% for bait.

In 2011, following concerns that the fishery may collapse, the Department of Primary Industries implemented a partial season closure and minimum commercial size limit of , although recreational fishing has not been further constrained. The NSW Status of Fisheries lists the pipi exploitation status as "Uncertain".

References

External links

Australian Government Department of Environment

A comparison between the commercial and recreational fisheries of the surf clam, Donax deltoides
* Museum collections: US National Museum of Natural History ite
USNM 347160
photographs by Adrian James Testa (CC0); Museums Victori

photographs by John Augier & David Staples (CC BY); National Museum of Rotterdam ite
NMR 16948
photo by Joop Trausel and Frans Slieker (C).

{{Taxonbar, from=Q7204346

Bivalves of Australia
Donacidae
Commercial molluscs
Endemic fauna of Australia
Taxa named by Jean-Baptiste Lamarck
Bivalves described in 1818