Oyster

Last updated

Oyster
Temporal range: 252–0  Ma
Crassostrea gigas p1040848.jpg
Pacific oyster from the Marennes-Oléron basin in France
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Pteriomorphia
Groups included
Cladistically included but traditionally excluded taxa

All other members of:

Mixed seafood in Dubai; oysters are at the edge of the tray Oyster dubai.jpg
Mixed seafood in Dubai; oysters are at the edge of the tray

Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species, the valves are highly calcified, and many are somewhat irregular in shape. Many, but not all oysters, are in the superfamily Ostreoidea.

Contents

Some species of oyster are commonly consumed and are regarded as a delicacy in some localities. Some types of pearl oysters are harvested for the pearl produced within the mantle. Others, such as the translucent Windowpane oysters, are harvested for their shells.

Etymology

The word oyster comes from Old French oistre, and first appeared in English during the 14th century. [1] The French derived from the Latin ostrea, the feminine form of ostreum, [2] which is the latinisation of the Ancient Greek ὄστρεον (ostreon) 'oyster'. [3] Compare ὀστέον (osteon) 'bone'. [4]

Types

True oysters

True oysters are members of the family Ostreidae. This family includes the edible oysters, which mainly belong to the genera Ostrea , Crassostrea , Magallana , and Saccostrea . Examples include the European flat oyster, eastern oyster, Olympia oyster, Pacific oyster, and the Sydney rock oyster. Ostreidae evolved in the Early Triassic epoch: The genus Liostrea grew on the shells of living ammonoids. [5]

Pearl oysters

Removing a pearl from a pearl oyster Pearl Oysters.jpg
Removing a pearl from a pearl oyster

Almost all shell-bearing mollusks can secrete pearls, yet most are not very valuable. Pearls can form in both saltwater and freshwater environments.

Pearl oysters are not closely related to true oysters, being members of a distinct family, the feathered oysters (Pteriidae). Both cultured pearls and natural pearls can be extracted from pearl oysters, though other molluscs, such as the freshwater mussels, also yield pearls of commercial value.

The largest pearl-bearing oyster is the marine Pinctada maxima, which is roughly the size of a dinner plate. Not all individual oysters produce pearls.

In nature, pearl oysters produce pearls by covering a minute invasive object with nacre. Over the years, the irritating object is covered with enough layers of nacre to become a pearl. The many different types, colours and shapes of pearls depend on the natural pigment of the nacre, and the shape of the original irritant.

Pearl farmers can culture a pearl by placing a nucleus, usually a piece of polished mussel shell, inside the oyster. In three to seven years, the oyster can produce a perfect pearl. Since the beginning of the 20th century, when several researchers discovered how to produce artificial pearls, the cultured pearl market has far outgrown the natural pearl market. [6]

Other types

A number of bivalve molluscs (other than true oysters and pearl oysters) also have common names that include the word "oyster", usually because they either taste like or look somewhat like true oysters, or because they yield noticeable pearls. Examples include:

In the Philippines, a local thorny oyster species known as Tikod amo is a favorite seafood source in the southern part of the country. [7] Because of its good flavor, it commands high prices.

Anatomy

Oysters breathe primarily via gills. In addition to their gills, oysters can exchange gases across their mantles, which are lined with many small, thin-walled blood vessels. A small, three-chambered heart, lying under the adductor muscle, pumps colorless blood to all parts of the body. At the same time, two kidneys, located on the underside of the muscle, remove waste products from the blood. Their nervous system includes two pairs of nerve cords and three pairs of ganglia. There is no evidence that oysters have a brain.

While some oysters have two sexes (European oyster and Olympia oyster), their reproductive organs contain both eggs and sperm. Because of this, it is technically possible for an oyster to fertilize its own eggs. The gonads surround the digestive organs, and are made up of sex cells, branching tubules, and connective tissue.

Once her millions of eggs are fertilized, the female discharges them into the water. The larvae develop in about six hours and exist suspended in the water column as veliger larvae for two to three weeks before settling on a bed and reaching sexual maturity within a year.

Feeding

Oysters are filter feeders, drawing water in over their gills through the beating of cilia. Suspended plankton and non-food particles are trapped in the mucus of a gill, and from there are transported to the mouth, where they are eaten, digested, and expelled as feces or pseudofeces that fall to the bottom and remain out of the water column. Oysters feed most actively at temperatures ranging from the high 60s to the high 70s (20–26 °C). [8] Under ideal laboratory conditions, an oyster can filter up to 190 L (50 US gal) of water per day. Under average conditions, mature oysters filter 11–45 L (3–12 U.S. gal). Chesapeake Bay's once-flourishing oyster population historically filtered excess nutrients from the estuary's entire water volume every three to four days. As of 2008 it was estimated that a complete cycle would take nearly a year. [9]

Habitat and behaviour

Oyster reef at about mid-tide off fishing pier at Hunting Island State Park, South Carolina Oyster reef Hunting Island SC.jpg
Oyster reef at about mid-tide off fishing pier at Hunting Island State Park, South Carolina

A group of oysters is commonly called a bed or oyster reef.

Rocks in intertidal zone covered by oysters, at Bangchuidao Scenic Area, Dalian, Liaoning Province, China Oyster Dalian.JPG
Rocks in intertidal zone covered by oysters, at Bangchuidao Scenic Area, Dalian, Liaoning Province, China

As a keystone species, oysters provide habitat for many marine species. Crassostrea and Saccostrea live mainly in the intertidal zone, while Ostrea is subtidal. The hard surfaces of oyster shells and the nooks between the shells provide places where a host of small animals can live. Hundreds of animals, such as sea anemones, barnacles, and hooked mussels, inhabit oyster reefs. Many of these animals are prey to larger animals, including fish, such as striped bass, black drum and croakers.

An oyster reef can increase the surface area of a flat bottom 50-fold. An oyster's mature shape often depends on the type of bottom to which it is originally attached, but it always orients itself with its outer, flared shell tilted upward. One valve is cupped and the other is flat.

Oysters usually reach maturity in one year. They are protandric; during their first year, they spawn as males by releasing sperm into the water. As they grow over the next two or three years and develop greater energy reserves, they spawn as females by releasing eggs. Bay oysters usually spawn from the end of June until mid-August. An increase in water temperature prompts a few oysters to spawn. This triggers spawning in the rest, clouding the water with millions of eggs and sperm. A single female oyster can produce up to 100 million eggs annually. The eggs become fertilized in the water and develop into larvae, which eventually find suitable sites, such as another oyster's shell, on which to settle. Attached oyster larvae are called spat. Spat are oysters less than 25 mm (1 in) long. Many species of bivalves, oysters included, seem to be stimulated to settle near adult conspecifics.

Pacific oyster Crassostrea gigas equipped with activity electrodes to follow their daily behaviour Electric oyster MolluSCAN eye project.jpg
Pacific oyster Crassostrea gigas equipped with activity electrodes to follow their daily behaviour

Oysters filter large amounts of water to feed and breathe (exchange O2 and CO2 with water) but they are not permanently open. They regularly shut their valves to enter a resting state, even when they are permanently submersed. Their behaviour follows very strict circatidal and circadian rhythms according to the relative moon and sun positions. During neap tides, they exhibit much longer closing periods than during the spring tide. [10]

Some tropical oysters, such as the mangrove oyster in the family Ostreidae, grow best on mangrove roots. Low tide can expose them, making them easy to collect.

The largest oyster-producing body of water in the United States is the Chesapeake Bay, although these beds have decreased in number due to overfishing and pollution. Other large oyster farming areas in the US include the bays and estuaries along the coast of the Gulf of Mexico from Apalachicola, Florida, in the east to Galveston, Texas, in the west. Large beds of edible oysters are also found in Japan and Australia. In 2005, China accounted for 80% of the global oyster harvest. [11] In Europe, France remained the industry leader.

Common oyster predators include crabs, seabirds, starfish, and humans. Some oysters contain crabs, known as oyster crabs. [12]

Nutrient cycling

Bivalves, including oysters, are effective filter feeders and can have large effects on the water columns in which they occur. [13] As filter feeders, oysters remove plankton and organic particles from the water column. [14] Multiple studies have shown individual oysters are capable of filtering up to 190 litres (42 imp gal; 50 US gal) of water per day, and thus oyster reefs can significantly improve water quality and clarity. [15] [16] [17] [18] Oysters consume nitrogen-containing compounds (nitrates and ammonia), phosphates, plankton, detritus, bacteria, and dissolved organic matter, removing them from the water. [19] What is not used for animal growth is then expelled as solid waste pellets, which eventually decompose into the atmosphere as nitrogen. [20] In Maryland, the Chesapeake Bay Program had implemented a plan to use oysters to reduce the amount of nitrogen compounds entering the Chesapeake Bay by 8,600 t (9,500 short tons) per year by 2010. [21] Several studies have shown that oysters and mussels have the capacity to dramatically alter nitrogen levels in estuaries. [22] [23] [24] In the U.S., Delaware is the only East Coast state without aquaculture, but making aquaculture a state-controlled industry of leasing water by the acre for commercial harvesting of shellfish is being considered. [25] Supporters of Delaware's legislation to allow oyster aquaculture cite revenue, job creation, and nutrient cycling benefits. It is estimated that one acre (0.40 ha) can produce nearly 750,000 oysters, which could filter between 57,000 to 150,000 m3 (2.0–5.3 million cu ft) of water daily. [25] Also see nutrient pollution for an extended explanation of nutrient remediation.

Ecosystem services

As an ecosystem engineer, oysters provide supporting ecosystem services, along with provisioning, regulating and cultural services. Oysters influence nutrient cycling, water filtration, habitat structure, biodiversity, and food web dynamics. [26] Oyster reef habitats have been recognized as green infrastructure for shoreline protection. [27] Assimilation of nitrogen and phosphorus into shellfish tissues provides an opportunity to remove these nutrients from the water column. [28] [29] [30] In California's Tomales Bay, native oyster presence is associated with higher species diversity of benthic invertebrates. [31] [32] As the ecological and economic importance of oyster reefs has become more acknowledged, restoration efforts have increased. [33]

Human history

Dishes with Oysters, Fruit, and Wine, a 1620s painting by Osias Beert Osias Beert the Elder - Dishes with Oysters, Fruit, and Wine - Google Art Project.jpg
Dishes with Oysters, Fruit, and Wine, a 1620s painting by Osias Beert

Middens testify to the prehistoric importance of oysters as food, with some middens in New South Wales, Australia, dated at ten thousand years. [35] They have been cultivated in Japan from at least 2000 BC. [35] In the United Kingdom, the town of Whitstable is noted for oyster farming from beds on the Kentish Flats that have been used since Roman times. The borough of Colchester holds an annual Oyster Feast each October, at which "Colchester Natives" (the native oyster, Ostrea edulis ) are consumed. The United Kingdom hosts several other annual oyster festivals; for example, Woburn Oyster Festival is held in September. In fact, in Victorian England, it was quite common for people to go to the pub and enjoy their favorite beer with some oysters. They quickly realized that the "rich, sweet, malty stouts" were great with the "briny, creamy oyster". Then brewers found that oyster shells naturally clarify a beer and they started putting crushed oyster shells into their brews. The first known brewery to start this was in 1938 at the Hammerton Brewery in London. That is where the oyster stout was first started. [36]

The French seaside resort of Cancale in Brittany is noted for its oysters, which also date from Roman times. Sergius Orata of the Roman Republic is considered the first major merchant and cultivator of oysters. Using his considerable knowledge of hydraulics, he built a sophisticated cultivation system, including channels and locks, to control the tides. He was so famous for this, the Romans used to say he could breed oysters on the roof of his house. [37]

Still-Life with Oysters by Alexander Adriaenssen Alexander Adriaenssen - Still-Life with Oysters - WGA0035.jpg
Still-Life with Oysters by Alexander Adriaenssen

In the early 19th century, oysters were cheap and mainly eaten by the working class. Throughout the 19th century, oyster beds in New York Harbor became the largest source of oysters worldwide. On any day in the late 19th century, six million oysters could be found on barges tied up along the city's waterfront. They were naturally quite popular in New York City, and helped initiate the city's restaurant trade. [38] New York's oystermen became skilled cultivators of their beds, which provided employment for hundreds of workers and nutritious food for thousands. Eventually, rising demand exhausted many of the beds. To increase production, they introduced foreign species, which brought disease; effluent and increasing sedimentation from erosion destroyed most of the beds by the early 20th century. Oysters' popularity has put ever-increasing demands on wild oyster stocks. [39] This scarcity increased prices, converting them from their original role as working-class food to their current status as an expensive delicacy.

In Britain, the native species ( European flat oyster ) has five years to mature and is protected by the people during their May-to-August spawning season. The current market is dominated by the larger Pacific oyster and Rock oyster species which are farmed year-round.

Fishing from the wild

The Whaleback Shell Midden in Maine contains the shells from oysters harvested for food dating from 2200 to 1000 years ago Whaleback Shell Midden gully - 20070722 07986.JPG
The Whaleback Shell Midden in Maine contains the shells from oysters harvested for food dating from 2200 to 1000 years ago

Oysters are harvested by simply gathering them from their beds. In very shallow waters, they can be gathered by hand or with small rakes. In somewhat deeper water, long-handled rakes or oyster tongs are used to reach the beds. Patent tongs can be lowered on a line to reach beds that are too deep to reach directly. In all cases, the task is the same: the oysterman scrapes oysters into a pile, and then scoops them up with the rake or tongs.

In some areas, a scallop dredge is used. This is a toothed bar attached to a chain bag. The dredge is towed through an oyster bed by a boat, picking up the oysters in its path. While dredges collect oysters more quickly, they heavily damage the beds, and their use is highly restricted. Until 1965, Maryland limited dredging to sailboats, and even since then motor boats can be used only on certain days of the week. These regulations prompted the development of specialized sailboats (the bugeye and later the skipjack) for dredging.

Similar laws were enacted in Connecticut before World War I and lasted until 1969. The laws restricted the harvesting of oysters in state-owned beds to vessels under sail. These laws prompted the construction of the oyster sloop-style vessel to last well into the 20th century. Hope is believed to be the last-built Connecticut oyster sloop, completed in 1948.

Oysters can also be collected by divers.

In any case, when the oysters are collected, they are sorted to eliminate dead animals, bycatch (unwanted catch), and debris. Then they are taken to market, where they are either canned or sold live.

Cultivation

Oyster culture in Riec-sur-Belon, France Oyster culture in Belon, France 03.jpg
Oyster culture in Riec-sur-Belon, France

Oysters have been cultured since at least the days of the Roman Empire. The Pacific oyster (Magallana gigas) is presently the most widely grown bivalve around the world. [40] Two methods are commonly used, release and bagging. In both cases, oysters are cultivated onshore to the size of spat, when they can attach themselves to a substrate. They may be allowed to mature further to form "seed oysters". In either case, they are then placed in the water to mature. The release technique involves distributing the spat throughout existing oyster beds, allowing them to mature naturally to be collected like wild oysters. Bagging has the cultivator putting spat in racks or bags and keeping them above the bottom. Harvesting involves simply lifting the bags or rack to the surface and removing the mature oysters. The latter method prevents losses to some predators, but is more expensive. [41]

The Pacific oyster has been grown in the outflow of mariculture ponds. When fish or prawns are grown in ponds, it takes typically 10 kg (22 lb) of feed to produce 1 kg (2+1⁄4 lb) of product (dry-dry basis). The other 9 kg (20 lb) goes into the pond and after mineralization, provides food for phytoplankton, which in turn feeds the oyster.

To prevent spawning, sterile oysters are now cultured by crossbreeding tetraploid and diploid oysters. The resulting triploid oyster cannot propagate, which prevents introduced oysters from spreading into unwanted habitats. [42]

Collected Oyster Shells at Galveston Bay for restoration project by the Galveston Bay Foundation's Oyster Shell Recycling Program. Oyster shells.jpg
Collected Oyster Shells at Galveston Bay for restoration project by the Galveston Bay Foundation's Oyster Shell Recycling Program.

Restoration and recovery

In many areas, non-native oysters have been introduced in attempts to prop up failing harvests of native varieties. For example, the eastern oyster (Crassostrea virginica) was introduced to California waters in 1875, while the Pacific oyster was introduced there in 1929. [43] Proposals for further such introductions remain controversial.

The Pacific oyster prospered in Pendrell Sound, where the surface water is typically warm enough for spawning in the summer. Over the following years, spat spread out sporadically and populated adjacent areas. Eventually, possibly following adaptation to the local conditions, the Pacific oyster spread up and down the coast and now is the basis of the North American west coast oyster industry. Pendrell Sound is now a reserve that supplies spat for cultivation. [44] Near the mouth of the Great Wicomico River in the Chesapeake Bay, five-year-old artificial reefs now harbor more than 180 million native Crassostrea virginica . That is far lower than in the late 1880s, when the bay's population was in the billions, and watermen harvested about 910,000 m3 (25 million imp bsh) annually. The 2009 harvest was less than 7,300 m3 (200,000 imp bsh). Researchers claim the keys to the project were:

The "oyster-tecture" movement promotes the use of oyster reefs for water purification and wave attenuation. An oyster-tecture project has been implemented at Withers Estuary, Withers Swash, South Carolina, by Neil Chambers-led volunteers, at a site where pollution was affecting beach tourism. [46] Currently, for the installation cost of $3000, roughly 4.8 million liters of water are being filtered daily. In New Jersey, however, the Department of Environmental Protection refused to allow oysters as a filtering system in Sandy Hook Bay and the Raritan Bay, citing worries that commercial shellfish growers would be at risk and that members of the public might disregard warnings and consume tainted oysters. New Jersey Baykeepers responded by changing their strategy for utilizing oysters to clean up the waterway, by collaborating with Naval Weapons Station Earle. The Navy station is under 24/7 security and therefore eliminates any poaching and associated human health risk. [47] Oyster-tecture projects have been proposed to protect coastal cities, such as New York, from the threat of rising sea levels due to climate change. [48] Additionally Oyster reef restoration has shown to increase the population of oyster beds within the oceans while also conserving the biolife within the oyster reefs.

Human impact

The accidental or intentional introduction of species by humans has the potential to negatively impact native oyster populations. For example, non-native species in Tomales Bay have resulted in the loss of half of California's Olympia oysters. [49] Oyster reefs occupy a small fraction of their distribution prior to mass harvesting during the last three centuries. [50]

In October 2017, it was reported that underwater noise pollution can affect oysters as they close their shells when exposed to low frequencies of sounds in experimental conditions. Oysters rely on hearing waves and currents to regulate their circadian rhythms, and perception of weather events—such as rain—may induce spawning. Cargo ships, pile drivers, and explosions conducted underwater produce low frequencies that may be detected by oysters. [51]

Environmental stressors as a result of global change are also negatively impacting oysters around the world, with many impacts affecting molecular, physiological, and behavioral processes in species including Magallana gigas. [52]

Shell recycling

Recycled oyster shells can help restore oyster reefs to provide marine life habitat that reduces flooding, and protects shorelines from storms. [53] Shell-recycling non-profits retrieve shells from restaurants, wash and dry them, and set them in the sun for up to a year to kill bacteria. Some states encourage shell recycling by offering tax incentives. [53]

As food

Freshly shucked European flat oyster European Flat Oyster.jpg
Freshly shucked European flat oyster

Jonathan Swift is quoted as having said, "He was a bold man that first ate an oyster". [54] Evidence of oyster consumption goes back into prehistory, evidenced by oyster middens found worldwide. Oysters were an important food source in all coastal areas where they could be found, and oyster fisheries were an important industry where they were plentiful. Overfishing and pressure from diseases and pollution have sharply reduced supplies, but they remain a popular treat celebrated in oyster festivals in many cities and towns.

It was once assumed that oysters were only safe to eat in months with the letter 'r' in their English and French names. This myth is based in truth, in that in the Northern Hemisphere, oysters are much more likely to spoil in the warmer months of May, June, July, and August. [55] In recent years[ citation needed ], pathogens such as Vibrio parahaemolyticus have caused outbreaks in several harvesting areas of the eastern United States during the summer months, lending further credence to this belief.

Dishes

Oysters can be eaten on the half shell, raw, smoked, boiled, baked, fried, roasted, stewed, canned, pickled, steamed, or broiled, or used in a variety of drinks. Eating can be as simple as opening the shell and eating the contents, including juice. Butter and salt are often added. Poached oysters can be served on toast with a cream roux. [56] In the case of Oysters Rockefeller, preparation can be very elaborate. They are sometimes served on edible seaweed, such as brown algae.

Care should be taken when consuming oysters. They may be eaten raw, with no dressing or with lemon juice, vinegar (most commonly shallot vinegar), or cocktail sauce. Upscale restaurants pair raw oysters with mignonette sauce, which consists primarily of fresh chopped shallot, mixed peppercorn, dry white wine and lemon juice or sherry vinegar. Raw oysters have complex flavors that vary among varieties and regions: salty, briny, buttery, metallic or fruity. The texture is soft and fleshy. North American varieties include Kumamoto and Yaquina Bay from Oregon, Duxbury and Wellfleet from Massachusetts, Malpeque from Prince Edward Island, Canada, Blue Point from Long Island, New York, Pemaquid from Maine, Rappahannock River and James River from Virginia, Chesapeake from Maryland and Cape May from New Jersey. Variations in water salinity, alkalinity, and mineral and nutritional content influence their flavor.

Nutrition

Oysters are an excellent source of zinc, iron, calcium, and selenium, as well as vitamin A and vitamin B12. Oysters are low in food energy; one dozen raw oysters provides only 460 kilojoules (110 kilocalories). [59] They are rich in protein (approximately 9 g in 100 g of Pacific oysters). [60] Two oysters (28 grams or 1 ounce) provide the Reference Daily Intake of zinc and vitamin B12. [61]

Traditionally, oysters are considered to be an aphrodisiac, partially because they resemble female sex organs. [62] A team of American and Italian researchers analyzed bivalves and found they were rich in amino acids that trigger increased levels of sex hormones. [63] Their high zinc content aids the production of testosterone. [38]

Shucking oysters

Special knives for opening live oysters, such as this one, have short and stout blades. Couteau a huitre - cote.jpg
Special knives for opening live oysters, such as this one, have short and stout blades.

Opening oysters, referred to as "oyster-shucking", requires skill. The preferred method is to use a special knife (called an oyster knife, a variant of a shucking knife), with a short and thick blade about 5 cm (2 in) long.

While different methods are used to open an oyster (which sometimes depend on the type), the following is one commonly accepted oyster-shucking method.

Inexperienced shuckers can apply too much force, which can result in injury if the blade slips. Heavy gloves, sometimes sold as oyster gloves, are recommended; apart from the knife, the shell itself can be razor-sharp. Professional shuckers require fewer than three seconds to open the shell. [38]

If the oyster has a particularly soft shell, the knife can be inserted instead in the "sidedoor", about halfway along one side where the oyster lips widen with a slight indentation.

Oyster-shucking has become a competitive sport; competitions are staged around the world. [64] The Guinness World Oyster Opening Championship was held annually in September at the Galway International Oyster Festival, in Galway, Ireland until 2010. [65] Since 2011, "Guinness" has been dropped from the title. [66]

Food safety and storage

Unlike most shellfish, oysters can have a fairly long shelf life of up to four weeks. However, their taste becomes less pleasant as they age. Fresh oysters must be alive just before consumption or cooking. [67]

Cooked oysters that do not open are generally assumed to be previously dead and therefore unsafe. [68] There is only one criterion: the oyster must be capable of tightly closing its shell.[ citation needed ] Open oysters should be tapped on the shell; a live oyster will close up and is safe to eat.[ citation needed ] Oysters which are open and unresponsive are dead and must be discarded. Some dead oysters, or oyster shells which are full of sand, may be closed. These make a distinctive noise when tapped, and are known as "clackers".

Oysters can contain harmful bacteria. Oysters are filter feeders, so will naturally concentrate anything present in the surrounding water. Oysters from the Gulf Coast of the United States, for example, contain high bacterial loads of human pathogens in the warm months, most notably Vibrio vulnificus and Vibrio parahaemolyticus . In these cases, the main danger is for immunocompromised individuals, who are unable to fight off infection and can succumb to sepsis, leading to death. Vibrio vulnificus is the most deadly seafood-borne pathogen. [69]

Depuration

Oysters in a depuration tank Oysters in depuration tank (8535757902).jpg
Oysters in a depuration tank

Depuration of oysters is a common industry practice and widely researched in the scientific community but is not commonly known by end consumers. The main objective of seafood depuration is to remove fecal contamination in seafood before being sold to end consumers. Oyster depuration is useful since they are generally eaten raw and in many countries, the requirement to process is government-regulated or mandatory. The United Nations Food and Agriculture Organization (FAO) formally recognizes depuration and has published detailed documents on the process, [70] whereas the Codex Alimentarius, encourages the application of seafood depuration. [71]

Oyster depuration begins after the harvest of oysters from farmed locations. The oysters are transported and placed into tanks pumped with clean water for periods of 48 to 72 hours. The holding temperatures and salinity vary according to species. The seawater that the oysters were originally farmed in does not remain in the oyster, since the water used for depuration must be fully sterilized, plus the depuration facility would not necessarily be located near the farming location. [72] Depuration of oysters can remove moderate levels of contamination of most bacterial indicators and pathogens. Well-known contaminants include Vibrio parahaemolyticus , a temperature-sensitive bacterium found in seawater animals, and Escherichia coli , a bacterium found in coastal waters near highly populated cities having sewage systems discharging waste nearby, or in the presence of agricultural discharges.[ citation needed ] Depuration expands beyond oysters into many shellfish and other related products, especially in seafood that is known to come from potentially polluted areas; depurated seafood is effectively a product cleansed from inside-out to make it safe for human consumption.

Cultural aspects

Religious

As shellfish, consumption of oyster is forbidden by Jewish dietary law. Similarly, in Islam, Jaʽafari Shia and Hanafi Sunni dietary jurisprudence prohibit consuming bivalves, including oysters, as it is makruh (highly disliked).

Diseases

Oysters are subject to various diseases which can reduce harvests and severely deplete local populations. Disease control focuses on containing infections and breeding resistant strains, and is the subject of much ongoing research.

Some oysters also harbor bacterial species which can cause human disease; of importance is Vibrio vulnificus , which causes gastroenteritis, which is usually self-limiting, and cellulitis. Cellulitis can be severe and rapidly spreading, requiring antibiotics, medical care, and in some severe cases amputation. It is usually acquired when the contents of the oyster come in contact with a cut skin lesion, as when shucking an oyster.

See also

Related Research Articles

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Shellfish, in colloquial and fisheries usage, are exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater environments, some are found in freshwater. In addition, a few species of land crabs are eaten, for example Cardisoma guanhumi in the Caribbean. Shellfish are among the most common food allergens.

<span class="mw-page-title-main">Clam</span> Common name for several kinds of bivalve mollusc

Clam is a common name for several kinds of bivalve mollusc. The word is often applied only to those that are edible and live as infauna, spending most of their lives halfway buried in the sand of the sea floor or riverbeds. Clams have two shells of equal size connected by two adductor muscles and have a powerful burrowing foot. They live in both freshwater and marine environments; in salt water they prefer to burrow down into the mud and the turbidity of the water required varies with species and location; the greatest diversity of these is in North America.

<span class="mw-page-title-main">Bivalvia</span> Class of molluscs

Bivalvia or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves. As a group, bivalves have no head and lack some typical molluscan organs such as the radula and the odontophore. Their gills have evolved into ctenidia, specialised organs for feeding and breathing.

<span class="mw-page-title-main">Eastern oyster</span> Species of bivalve

The eastern oyster —also called the Atlantic oyster, American oyster, or East Coast oyster—is a species of true oyster native to eastern North and South America. Other names in local or culinary use include the Wellfleet oyster, Virginia oyster, Malpeque oyster, Blue Pointoyster, Chesapeake Bay oyster, and Apalachicola oyster. C. virginica ranges from northern New Brunswick south through parts of the West Indies to Venezuela. It is farmed in all of the Maritime provinces of Canada and all Eastern Seaboard and Gulf states of the United States, as well as Puget Sound, Washington, where it is known as the Totten Inlet Virginica. It was introduced to the Hawaiian Islands in the 19th century and is common in Pearl Harbor.

<span class="mw-page-title-main">Hard clam</span> Species of bivalve mollusc native to the east coast of North and Central America

The hard clam, also known as the round clam, hard-shellclam, or the quahog, is an edible marine bivalve mollusk that is native to the eastern shores of North America and Central America from Prince Edward Island to the Yucatán Peninsula. It is one of many unrelated edible bivalves that in the United States are frequently referred to simply as clams. Older literature sources may use the systematic name Venus mercenaria; this species is in the family Veneridae, the venus clams.

<span class="mw-page-title-main">Fish hatchery</span> Aquaculture facility

A fish hatchery is a place for artificial breeding, hatching, and rearing through the early life stages of animals—finfish and shellfish in particular. Hatcheries produce larval and juvenile fish, shellfish, and crustaceans, primarily to support the aquaculture industry where they are transferred to on-growing systems, such as fish farms, to reach harvest size. Some species that are commonly raised in hatcheries include Pacific oysters, shrimp, Indian prawns, salmon, tilapia and scallops.

<span class="mw-page-title-main">Pacific oyster</span> Species of bivalve

The Pacific oyster, Japanese oyster, or Miyagi oyster is an oyster native to the Pacific coast of Asia. It has become an introduced species in North America, Australia, Europe, and New Zealand.

Oyster farming is an aquaculture practice in which oysters are bred and raised mainly for their pearls, shells and inner organ tissue, which is eaten. Oyster farming was practiced by the ancient Romans as early as the 1st century BC on the Italian peninsula and later in Britain for export to Rome. The French oyster industry has relied on aquacultured oysters since the late 18th century.

<i>Ostrea angasi</i> Species of oyster endemic to southern Australia

The southern mud oyster, Australian flat oyster, native flat oyster, native mud oyster, or angasi oyster, is endemic to southern Australia, ranging from Western Australia to southeast New South Wales and around Tasmania. Ostrea angasi superficially resembles Ostrea edulis and both species may be referred to with the name "flat oyster". However, the two species do not occur naturally in the same geographic distribution.

<i>Ostrea edulis</i> Species of oyster

Ostrea edulis, commonly known as the European flat oyster, is a species of oyster native to Europe. In Great Britain and Ireland, regional names include Colchester native oyster, mud oyster, or edible oyster. In France, Ostrea edulis are known as huîtres plates except for those that come from the Belon River estuary in Brittany, France, which are known as Belons.

<span class="mw-page-title-main">Integrated multi-trophic aquaculture</span> Type of aquaculture

Integrated multi-trophic aquaculture (IMTA) is a type of aquaculture where the byproducts, including waste, from one aquatic species are used as inputs for another. Farmers combine fed aquaculture with inorganic extractive and organic extractive aquaculture to create balanced systems for environment remediation (biomitigation), economic stability and social acceptability.

<span class="mw-page-title-main">Netarts Bay</span> Bay in Oregon

Netarts Bay is an estuarine bay on the northern Oregon Coast of the U.S. state of Oregon, located about 5 miles (8.0 km) southwest of Tillamook. The unincorporated community of Netarts is located on the north end of the bay and Netarts Bay Shellfish Preserve, managed by Oregon Department of Fish and Wildlife, is located on the south side of the bay. The sand spit on the west side of Netarts bay is part of Cape Lookout State Park.

<span class="mw-page-title-main">Pseudofeces</span> Mucus bound masses with indigestable material suspended in it created by bivalves

Pseudofeces or pseudofaeces are a specialized method of expulsion that filter-feeding bivalve mollusks use in order to get rid of suspended particles such as particles of grit which cannot be used as food, and which have been rejected by the animal. The rejected particles are wrapped in mucus, and are then expelled without having passed through the digestive tract. Thus, although they may closely resemble the mollusk's real feces, they are not actually feces, hence the name pseudofeces, meaning false feces.

<i>Ostrea lurida</i> Species of bivalve

Ostrea lurida, common name the Olympia oyster, after Olympia, Washington in the Puget Sound area, is a species of small, edible oyster, a marine bivalve mollusk in the family Ostreidae. This species occurs on the northern Pacific coast of North America. Over the years the role of this edible species of oyster has been partly displaced by the cultivation of non-native edible oyster species.

<span class="mw-page-title-main">Aquaculture in New Zealand</span>

Aquaculture started to take off in New Zealand in the 1980s. It is dominated by mussels, oysters and salmon. In 2007, aquaculture generated about NZ$360 million in sales on an area of 7,700 hectares. $240 million was earned in exports.

<span class="mw-page-title-main">Scallop aquaculture</span> Commercial activity of cultivating (farming) scallops

Scallop aquaculture is the commercial activity of cultivating (farming) scallops until they reach a marketable size and can be sold as a consumer product. Wild juvenile scallops, or spat, were collected for growing in Japan as early as 1934. The first attempts to fully cultivate scallops in farm environments were not recorded until the 1950s and 1960s. Traditionally, fishing for wild scallops has been the preferred practice, since farming can be expensive. However worldwide declines in wild scallop populations have resulted in the growth of aquaculture. Globally the scallop aquaculture industry is now well established, with a reported annual production totalling over 1,200,000 metric tonnes from about 12 species. China and Japan account for about 90% of the reported production.

<span class="mw-page-title-main">Oyster reef restoration</span> Process of rebuilding or restoring of oyster reefs

Oyster reef restoration refers to the reparation and reconstruction of degraded oyster reefs. Environmental changes, modern fishing practices, over harvesting, water pollution, and other factors, have resulted in damage, disease, and ultimately, a large decline in global population and prevalence of oyster habitats. Aside from ecological importance, oyster farming is an important industry in many regions around the world. Both natural and artificial materials have been used in efforts to increase population and regenerate reefs.

The Suminoe oyster, is a species of true oyster which inhabits intertidal hard grounds and substrate, as well as muddy creeks of warm estuaries throughout the western Pacific. It is large and flat in appearance and almost identical in gross morphology to Crassostrea virginica.

<span class="mw-page-title-main">Oyster reef</span> Rock-like reefs, composed of dense aggregations of oysters

The term oyster reef refers to dense aggregations of oysters that form large colonial communities. Because oyster larvae need to settle on hard substrates, new oyster reefs may form on stone or other hard marine debris. Eventually the oyster reef will propagate by spat settling on the shells of older or nonliving oysters. The dense aggregations of oysters are often referred to as an oyster reef, oyster bed, oyster bank, oyster bottom, or oyster bar interchangeably. These terms are not well defined and often regionally restricted.

Thousands of years prior to European settlement of the Pacific Northwest of the United States the native oyster species Ostrea lurida had been established as a valuable dietary resource for indigenous people living on the coastal waters. European settlers who began to colonize the Pacific Northwest developed an acquired taste for shellfish, especially oysters, a delicacy that were considered to be a symbol of wealth. In the early history of the Pacific Northwest, people satisfied their hunger for shellfish by harvesting naturally occurring oyster beds. It was initially believed that the populations of indigenous oysters were sufficient to supply both tribal and commercial harvest. A marketable industry was created on the export of oysters and soon exploitation of harvesting had depleted the natural oyster beds in California and Oregon. As a result, Washington state became the main supplier to areas along the coast which had failed to establish any conservation practices. Noticing the economic value and decline of natural availability, farmers began efforts to cultivate oysters to try to satisfy demand. Over the years the oyster industry of the Pacific Northwest has gone from extremely lucrative to completely nonexistent, but still the industry has been able to adapt and survive.

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