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Abalone (/ˈæbəloʊni/ ⓘ or/ˌæbəˈloʊni/; via Spanishabulón, fromRumsenaulón) is acommon name for any small to very largemarinegastropodmollusc in thefamilyHaliotidae, which once contained sixgenera but now contains only one genus,Haliotis.[1] Othercommon names areear shells,sea ears, and, now rarely,muttonfish ormuttonshells in parts ofAustralia,ormer in theUnited Kingdom,perlemoen inSouth Africa, andpāua inNew Zealand.[2] The number of abalone species recognized worldwide ranges between 30[3] and 130[4] with over 230 species-level taxa described. The most comprehensive treatment of the family considers 56 species valid, with 18 additionalsubspecies.[5]
Theshells of abalone have a low, open spiral structure, and are characterized by several open respiratory pores in a row near the shell's outer edge. The thick inner layer of the shell is composed ofnacre, which in many species is highlyiridescent, giving rise to a range of strong, changeable colors which make the shells attractive to humans asornaments,jewelry, and as a source of colorfulmother-of-pearl.
The flesh of abalone is widely considered to be adelicacy, and is consumed raw or cooked by a variety ofcuisines.
Most abalone vary in size from 20 mm (0.8 in) (Haliotis pulcherrima) to 200 mm (8 in). The largest species,Haliotis rufescens, reaches 300 mm (12 in).[6]
The shell of abalone isconvex, rounded to oval in shape, and may be highly arched or very flattened. The shell of the majority of species has a small, flatspire and two to threewhorls. The last whorl, known as thebody whorl, isauriform, meaning that the shell resembles an ear, giving rise to the common name "ear shell".Haliotis asinina has a somewhat different shape, as it is more elongated and distended. The shell ofHaliotis cracherodii cracherodii is also unusual as it has anovate form, isimperforate, shows anexserted spire, and has prickly ribs.
Amantle cleft in the shell impresses a groove in the shell, in which are the row of holes characteristic of the genus. These holes are respiratory apertures for venting water from the gills and for releasing sperm and eggs into the water column.[7] They make up what is known as theselenizone, which forms as the shell grows. This series of eight to 38 holes is near the anterior margin. Only a small number is generally open. The older holes are gradually sealed up as the shell grows and new holes form. Each species has a typical number of open holes, between four and 10, in the selenizone. An abalone has nooperculum. Theaperture of the shell is very wide andnacreous.[7]
The exterior of the shell is striated and dull. The color of the shell is very variable from species to species, which may reflect the animal's diet.[2] The iridescentnacre that lines the inside of the shell varies in color from silvery white, to pink, red and green-red to deep blue, green to purple.
The animal hasfimbriated head lobes and side lobes that are fimbriated andcirrated. Theradula has small median teeth, and the lateral teeth are single and beam-like. They have about 70uncini, withdenticulated hooks, the first four very large. The rounded foot is very large in comparison to most molluscs. The soft body is coiled around thecolumellar muscle, and its insertion, instead of being on the columella, is on the middle of the inner wall of the shell. Thegills are symmetrical and both well developed.[8]
These snails cling solidly with their broad, muscular foot to rocky surfaces atsublittoral depths, although some species such asHaliotis cracherodii used to be common in theintertidal zone. Abalone reach maturity at a relatively small size. Theirfecundity is high and increases with their size, laying from 10,000 to 11 million eggs at a time. Thespermatozoa arefiliform and pointed at one end, and the anterior end is a rounded head.[9]
The haliotid family has a worldwide distribution, along the coastal waters of every continent, except the Pacific coast of South America, the Atlantic coast of North America, theArctic, andAntarctica.[10] The majority of abalone species are found in cold waters, such as off the coasts of New Zealand, South Africa, Australia, Western North America, and Japan.[11]
The shell of the abalone is exceptionally strong and is composed of a tightly packedcalcium carbonate matrix. Layered among the matrix is an endogenous protein further strengthening the shell. Due to the unique structure of the shell, a force applied directly to the shell matrix will more likely cause the shedding of layers as opposed to cracking or shattering.Material scientists are currently studying this structure for insight into strongerablative protective tools such asbody armor.[12]
The dust created by grinding and cutting abalone shell is dangerous; appropriate safeguards must be taken to protect people from inhaling these particles.[13]
Abalone are subject to various infectious diseases. TheVictorian Department of Primary Industries said in 2007 thatganglioneuritis killed up to 90% of stock in affected regions. Abalone possess very little clotting factor, meaning even a mild to moderate skin-piercing injury can result in death from fluid loss. Members of theSpionidae of thepolychaetes are known as pests of abalone.[14]
Abalone have been harvested as a source of food and esthetics since prehistory. Abalone shells and associated materials, like their claw-likepearls andnacre, have been used as jewelry and for buttons, buckles, and inlay.[15][16][17] These shells have been found in archaeological sites around the world, ranging from 100,000-year-old deposits at Blombos Cave in South Africa to historic Chinese abalone middens on California's Northern Channel Islands.[18][19] For at least 12,000 years, abalone were harvested to such an extent around theChannel Islands that shells in the area decreased in size four thousand years ago.[20]
Farming of abalone began in the late 1950s and early 1960s in Japan and China.[21] Since the mid-1990s, there have been many increasingly successful endeavors to commercially farm abalone for the purpose of consumption.[22] Overfishing and poaching have reduced wild populations to such an extent that farmed abalone now supplies most of the abalone meat consumed. The principal abalone farming regions are China, Taiwan,[23] Japan, and Korea. Abalone is also farmed in Australia, Canada, Chile, France,[24]Iceland, Ireland, Mexico,Namibia, New Zealand, South Africa, Spain,[25] Thailand, and the United States.[26]
After trials in 2012,[27] a commercial "sea ranch" was set up inFlinders Bay, Western Australia to raise abalone. The ranch is based on an artificial reef made up of 5,000 separate concrete abalone habitat units, which can host 400 abalone each. The reef is seeded with young abalone from an onshore hatchery.
The abalone feed on seaweed that grows naturally on the habitats; the ecosystem enrichment of the bay also results in growing numbers ofdhufish,pink snapper,wrasse, andSamson fish among other species.[28][29]
Abalone have long been a valuable food source for humans in every area of the world where a species is abundant. The meat of this mollusc is considered adelicacy in certain parts of Latin America (particularly Chile), France, New Zealand, East Asia and Southeast Asia. In the Greater China region and among Overseas Chinese communities, abalone is commonly known asbao yu, and sometimes forms part of a Chinese banquet. In the same way asshark fin soup orbird's nest soup, abalone is considered aluxury item, and is traditionally reserved for celebrations.
As abalone became more popular and less common, the prices adjusted accordingly. In the 1920s, a restaurant-served portion of abalone, about 4 ounces, would cost (in inflation adjusted dollars) about US$7; by 2004, the price had risen to US$75.[30] In the United States, prior to this time, abalone was predominantly eaten, gathered, and prepared by Chinese immigrants.[31] Before that, abalone were collected to be eaten, and used for other purposes by Native American tribes.[32] By 1900, laws were passed in California to outlaw the taking of abalone above theintertidal zone. This forced the Chinese out of the market and the Japanese perfected diving, with or without gear, to enter the market. Abalone started to become popular in the US after thePanama–Pacific International Exposition in 1915, which exhibited 365 varieties of fish with cooking demonstrations, and a 1,300-seat dining hall.[33]
In Japan, live and raw abalone are used in awabi sushi, or served steamed, salted, boiled, chopped, or simmered insoy sauce. Salted, fermented abalone entrails are the main component oftottsuru, a local dish from Honshū.Tottsuru is mainly enjoyed with sake.[34]
In South Korea, abalone is calledJeonbok (/juhn-bok/) and used in various recipes.Jeonbok porridge and pan-fried abalone steak with butter are popular but also commonly used in soups or ramyeon.
In California, abalone meat can be found on pizza, sautéed with caramelized mango, or in steak form dusted with cracker meal and flour.[35]
Tasmania supplies about 25% of the yearly world abalone harvest.[36] Around 12,500 Tasmanians recreationally fish forblacklip andgreenlip abalone. For blacklip abalone, the size limit varies between 138 mm (5.4 in) for the southern end of the state and 127 mm (5.0 in) for the northern end of the state.[37] Greenlip abalone have a minimum size of 145 mm (5.7 in), except for an area aroundPerkins Bay in the north of the state where the minimum size is 132 millimetres (5.2 in). With a recreational abalone licence, the bag limit is 10 per day, with a total possession limit of 20.Scuba diving for abalone is allowed, and has a rich history in Australia. (Scuba diving for abalone in the states ofNew South Wales andWestern Australia is illegal; afree-diving catch limit of two is allowed).[38][39]
Victoria has had an active abalone fishery since the late 1950s. The state is sectioned into three fishing zones, Eastern, Central and Western, with each fisher required a zone-allocated licence. Harvesting is performed by divers using surface-supplied air "hookah" systems operating from runabout-style, outboard-powered boats. While the diver seeks out colonies of abalone amongst the reef beds, the deckhand operates the boat, known as working "live" and stays above where the diver is working. Bags of abalone pried from the rocks are brought to the surface by the diver or by way of "shot line", where the deckhand drops a weighted rope for the catch bag to be connected then retrieved. Divers measure each abalone before removing from the reef and the deckhand remeasures each abalone and removes excess weed growth from the shell. Since 2002, the Victorian industry has seen a significant decline in catches, with the total allowable catch reduced from 1440 to 787 tonnes for the 2011/12fishing year, due to dwindling stocks and most notably the abalone virusganglioneuritis, which is fast-spreading and lethal to abalone stocks.
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Sport harvesting ofred abalone is permitted with a California fishing license and an abalone stamp card. In 2008, the abalone card also came with a set of 24 tags. This was reduced to 18 abalone per year in 2014, and as of 2017 the limit has been reduced to 12, only nine of which may be taken south ofMendocino County. Legal-size abalone must be tagged immediately.[40] Abalone may only be taken using breath-hold techniques or shorepicking; scuba diving for abalone is strictly prohibited.[41] Taking of abalone is not permitted south of the mouth ofSan Francisco Bay.[42] A size minimum of 7 in (180 mm) measured across the shell is in place. A person may be in possession of only three abalone at any given time.[43][44]
As of 2017, abalone season is May to October, excluding July. Transportation of abalone may only legally occur while the abalone is still attached in the shell. Sale of sport-obtained abalone is illegal, including the shell. Only red abalone may be taken, asblack,white,pink,flat,green, andpinto abalone are protected by law.[43] In 2018, theCalifornia Fish and Game Commission closed recreational abalone season due to dramatically declining populations. That year, they extended the moratorium to last through April 2021.[45] Afterwards, they extended the ban for another 5 years until April 2026.[46]
An abalone diver is normally equipped with a thickwetsuit, including a hood,bootees, and gloves, and usually also a mask,snorkel,weight belt, abalone iron, and abalone gauge. Alternatively, the rock picker can feel underneath rocks at low tides for abalone. Abalone are mostly taken in depths from a few inches up to 10 m (33 ft); less common are freedivers who can work deeper than 10 m (33 ft). Abalone are normally found on rocks near food sources such askelp. An abalone iron is used to pry the abalone from the rock before it has time to fully clamp down. Divers dive from boats, kayaks, tube floats, or directly off the shore.[41]
The largest abalone recorded in California is 12.34 in (31.3 cm), caught by John Pepper somewhere off the coast ofSan Mateo County in September 1993.[47]
The molluscConcholepas concholepas is often sold in the United States under the name "Chilean abalone", though it is not an abalone, but amuricid.
In New Zealand, abalone is calledpāua (/ˈpaʊə/, from theMāori language).Haliotis iris (or blackfoot pāua) is the ubiquitous New Zealand pāua, the highly polished nacre of which is extremely popular as souvenirs with its striking blue, green, and purple iridescence.Haliotis australis andHaliotis virginea are also found in New Zealand waters, but are less popular thanH. iris.Haliotis pirimoana is a small species endemic toManawatāwhi / the Three Kings Islands that superficially resemblesH. virginea.[48][49]
Like all New Zealand shellfish, recreational harvesting ofpāua does not require a permit provided catch limits, size restrictions, and seasonal and local restrictions set by theMinistry for Primary Industries (MPI) are followed. The legal recreational daily limit is 10 per diver, with a minimum shell length of 125 mm (4.9 in) forH. iris and 80 mm (3.1 in) forH. australis. In addition, no person may be in possession, even on land, of more than 20 pāua or more than 2.5 kg (5.5 lb) of pāua meat at any one time. Pāua can only be caught by free-diving; it is illegal to catch them using scuba gear.
An extensive global black market exists in collecting and exporting abalone meat. This can be a particularly awkward problem where the right to harvest pāua can be granted legally underMāori customary rights. When such permits to harvest are abused, it is frequently difficult to police. The limit is strictly enforced by rovingMinistry for Primary Industries fishery officers with the backing of the New Zealand Police.Poaching is a major industry in New Zealand with many thousands being taken illegally, often undersized. Convictions have resulted in seizure of diving gear, boats, and motor vehicles and fines and in rare cases, imprisonment.
There are five species endemic to South Africa, namelyH. parva,H. spadicea,H. queketti andH. speciosa.[50]
The largest abalone in South Africa,Haliotis midae, occurs along roughly two-thirds of the country's coastline. Abalone-diving has been a recreational activity for many years, but stocks are currently being threatened byillegal commercial harvesting.[51] In South Africa, all persons harvesting this shellfish need permits that are issued annually, and no abalone may be harvested using scuba gear.
For the last few years, however, no permits have been issued for collecting abalone, but commercial harvesting still continues as does illegal collection bysyndicates.[52]In 2007, because of widespreadpoaching of abalone, the South African government listed abalone as an endangered species according to theCITES section III appendix, which requests member governments to monitor the trade in this species. This listing was removed from CITES in June 2010 by the South African government and South African abalone is no longer subject to CITES trade controls. Export permits are still required, however.The abalone meat from South Africa is prohibited for sale in the country to help reduce poaching; however, much of the illegally harvested meat is sold in Asian countries. As of early 2008, the wholesale price for abalone meat was approximately US$40.00 per kilogram. There is an active trade in the shells, which sell for more than US$1,400 pertonne.
Ormers (Haliotis tuberculata) are considered a delicacy in the BritishChannel Islands as well as in adjacent areas of France, and are pursued with great alacrity by the locals. This, and a recent lethal bacterial disease,[53] has led to a dramatic depletion in numbers since the latter half of the 19th century, and "ormering" is now strictly regulated to preserve stocks. The gathering of ormers is now restricted to a number of 'ormering tides', from 1 January to 30 April, which occur on the full or new moon and two days following. No ormers may be taken from the beach that are under 80 millimetres (3.1 in) in shell length. Gatherers are not allowed to wear wetsuits or even put their heads underwater. Any breach of these laws is a criminal offence and can lead to a fine of up to £5,000 or six months in prison.[54] The demand for ormers is such that they led to the world's first underwater arrest, when Mr. Kempthorne-Leigh ofGuernsey was arrested by a police officer in full diving gear when illegally diving for ormers.[55]
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The highly iridescent inner nacre layer of the shell of abalone has traditionally been used as a decorative item, in jewelry,[2] buttons, and as inlay in furniture and musical instruments, such as onfret boards and binding of guitars.[56] See articleNajeonchilgi regarding Korean handicraft.
Abalone has been an important staple in a number ofIndigenous cultures around the world, specifically inAfrica and on theNorthwest American coast. The meat is a traditional food, and the shell is used to make ornaments; historically, the shells were also used as currency in some communities.[57]
Abalone are critically threatened due to overfishing and theacidification of oceans[58] as lower pH erodes the calcium carbonate in their shells. In the 21st century, white, pink, and green abalone are on the United States federal endangered species list. Possible restoration sites have been proposed for the San Clemente Island and Santa Barbara Island areas.[59] Reintroduction of farming abalone to the wild has been proposed, with these abalone having special tags to help track the population.[60]
The number of species that are recognized within the genusHaliotis has fluctuated over time, and depends on the source that is consulted. The number of recognized species range from 30[3] to 130.[4] This list finds a compromise using the WoRMS database, plus some species that have been added, for a total of 57.[1][61] The majority of abalone have not been rated for conservation status. Those that have been reviewed tend to show that the abalone in general is an animal that is declining in numbers, and will need protection throughout the globe.
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