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Oyster

Crassostrea virginica (Gmelin 1791)

Conservation Status

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Oyster health is highly contingent upon water quality. Chemical contamination is widespread and detrimental. Extensive efforts are being made in British Columbia to purify water to benefit all aquatic organisms. Toxicity in shellfish can be passed on to consumers, resulting in a condition termed PSP in humans, which is potentially fatal.

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Benefits

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A major problem caused by the oyster is fouling, or attachment, often to boats.

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Benefits

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Oyster cultch or oyster spat is fairly valuable to jewelry trade, though it is rather abundant, due to the large numbers of existing oysters and their relatively high rate of reproductive success. Certain lime or cement coatings are enhaced by use of the cultch. Some Eastern oysters produce pearls as well. Oyster meat is also smoked and canned as a food.

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Trophic Strategy

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After spawning in early spring, the oyster loses a great deal of weight. This event usually coincides with the spring bloom of phytoplankton, their primary food source. Feeding is dependent upon water temperature; more food is consumed at higher temperatures than at lower.

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Distribution

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Gulf of St. Lawrence to the Gulf of Mexico and the West Indies. It was introduced to San Francisco Bay but did not survive.

Biogeographic Regions: nearctic (Native ); neotropical (Native ); atlantic ocean (Native )

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Habitat

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Although water temperature affects growth rate, it appears to be irrelevant in site selection. Oysters inhabit areas of fairly constant turbidity and salinity. The oyster is eurytherma,l or able to withstand a wide range of temperatures including freezing temperatures.

Aquatic Biomes: reef ; coastal

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Morphology

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The Eastern oyster is relatively large, growing up to 10 cm. in length. It is normally somewhat pear-shaped in outline, but members of this species vary greatly in size and shape. The shell is dirty gray externally and white internally, except for the muscle scar, which is deep purple.

Other Physical Features: ectothermic ; bilateral symmetry

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Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Untitled

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Although it is only distantly related to the true pearl oyster (which, in fact, is not an oyster), it can and occasionally does produce pearls. The Eastern oyster can exist in water of extreme variations in turbidity and salinity.

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The Regents of the University of Michigan and its licensors
bibliographic citation
Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Reproduction

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Reproductive organs can be readily observed only during the breeding season. There is no reproductive activity during the winter. Sexual maturity is a function of size rather than age. The first spawning usually occurs when the oyster is 2 years of age. Fertilization occurs when huge numbers of sperm sperm and eggs are expelled from the male or female and meet in the water.

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bibliographic citation
Osborne, P. 1999. "Crassostrea virginica" (On-line), Animal Diversity Web. Accessed April 27, 2013 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Crassostrea_virginica.html
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Paula Osborne, University of Michigan-Ann Arbor
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Breeding Season

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
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Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Care of Adults

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Woods Hole, Maine
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Donald P. Costello and Catherine Henley
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Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Fertilization and Cleavage

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Woods Hole, Maine
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Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Later Stages of Development and Metamorphosis

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
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copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Living Material

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Preparation of Cultures

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Procuring Gametes

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Rate of Development

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Removal of the Chorion

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

The Unfertilized Ovum

provided by Egg Characteristics and Breeding Season for Woods Hole Species
Woods Hole, Maine
license
cc-by-nc-sa-3.0
copyright
Donald P. Costello and Catherine Henley
bibliographic citation
Costello, D.P. and C. Henley (1971). Methods for obtaining and handling marine eggs and embryos. Marine Biological Laboratory, Woods Hole, MA (Second Edition)
author
Costello, D.P.
author
C. Henley

Diagnostic Description

provided by FAO species catalogs
Shell solid, inequivalve left (lower) valve convex, right (upper) valve tending to be flat, though often bent sitting within the left; inequilateral, beaks and umbones not prominent, tending to be broadly oval in outline but often distorted. Ligament internal, attached to a central triangular pit, with lateral extensions. Sculpture of concentric ridges and lines with a few irregular radiating ribs on the left valve which do not normally meet or indent the margin. Hinge line without teeth in the adult. Shell margins smooth. Colour white, dirty white or brown, sometimes with dark purple markings. Periostracum thin, dark brown; interior of shell white; adductor muscle scar near the posterior margin, a deep purple or red-brown.

References

  • Poutiers, J.M.- 1987 Ostreidae. In: W. Fischer; M.-L. Bauchot (eds.) Fiches FAO d'Identification des espèces pour les besoins de la pêche. (Révision 1). Méditerranée et mer Noire. Zone de Pêche 37. Vol. I. Végétaux et Invertébres. Rome, FAO, 447-452.
  • Stanley, J. & M. Sellers - 1986Species Profiles: Life Histories and Environmental Requirements of Coastal Fishes and Invertebrates (Gulf of Mexico), American oyster. U.S. Fish and Wildlife Service Biol. Rep. 82 (11.64). 25 pp.
  • Tebble, N. - 1966British Bivalve Seashells. A Handbook for Identification, London Trusties of the British Nuseum (Natural History): 212 pp.

Distribution

provided by FAO species catalogs
Western Atlantic Ocean from the Gulf of Mexico and Panama to South Maine, and in the Gulf of St. Lawrence. Imported in Europe (British Islands to to Bay of Biscay) prior to 1939, but the colonies seem to have some difficulties in proliferating. Caught occasionally, with bottom trawls and dredges, in the Adriatic Sea (Mediterranean Sea).

Size

provided by FAO species catalogs
Measuring to 25 cm cm from hinge-line to the opposite margin; common 8-18 cm.

Brief Summary

provided by FAO species catalogs
Sessile (cemented to the substrate on its left valve).Oysters favor estuaries and sounds with salinities between 5 and 30% and are intolerant of prolonged exposure to fresh water or marine salinities. Filter feeder.Also they are found in shallow areas of tidal to subtidal zones (between 0,5-75 meters),prefer a firm substrate (pilings, hard rock bottoms, and substrates firmed with the oyster shells of previous generations). The American oyster is an epibenthicsuspension feeder, ingesting a variety of algae, bacteria, and small detrital particles. Fecal and pseudofecal material is important in sediment production and deposition, providing sites for remineralizing bacterial action, and as food source for deposit feeders.Swimming larvae have positive phototaxis, which becomes negative with increased temperature.

Benefits

provided by FAO species catalogs
American oysters are prominent members of the benthic community in Chesapeake Bay (USA) and contribute substantially to the economy of the region. Oysters have recently experienced severe declines in abundance. Intense fishing pressure, loss of habitat, and water quality degradation have been blamed for declines in the abundance of this species. Its meat is not highly sought after by European consumers. Resource very important in Gulf of Mexico (Tamaulipas, Veracruz and Tabasco). The total catch reported for this species to FAO for 1999 was 132 207 t. The countries with the largest catches were USA (89 714 t) and Mexico (39 268 t). Marketed fresh.

Eastern oyster

provided by wikipedia EN

The eastern oyster (Crassostrea virginica)—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,[3] Virginia oyster, Malpeque oyster, Blue Point oyster, Chesapeake Bay oyster, and Apalachicola oyster. C. virginica ranges from northern New Brunswick south through parts of the West Indies[4] to Venezuela.[5][6]: 7  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.[7] It was introduced to the Hawaiian Islands in the nineteenth century and is common in Pearl Harbor.[8]

The eastern oyster is an important commercial species. Its distribution has been affected by habitat change; less than 1% of the population present when the first European colonists arrived is thought to remain in the Chesapeake Bay and its tributaries.[9] As of 2014, the global conservation status of Crassostrea virginica, as assessed by NatureServe, is "vulnerable," as the oyster's populations are threatened by overharvest and water pollution.[1] Other threats to the eastern oyster include global warming, diseases and parasites and competition with invasive species.[10]

Description

Like all oysters, Crassostrea virginica is a bivalve mollusk with a hard calcium carbonaceous shell that protects it from predation.

This particular type of oyster is important to its ecosystem. Like all oysters, C. virginica is a filter feeder. It sucks in water and filters out the plankton and detritus to swallow, then spits the water back out, thus cleaning the water around it. One oyster can filter up to 50 gallons of water in 24 hours.[11] Eastern oysters also provide a key structural element within their ecosystem, making them a foundation species in many environments, and they serve as ecosystem engineers in western Atlantic estuaries.[12][13] Like coral reefs, oyster beds, also known as oyster reefs, provide key habitat for a variety of different species by creating hard substrate for attachment and habitation.[14] Oyster beds have an estimated 50 times the surface area of an equally sized flat bottom. The beds also attract a high concentration of larger predators looking for food.[15]

The eastern oyster, like all members of the family Ostreidae, can make small pearls to surround particles that enter the shell. These pearls, however, are insignificant in size and of no monetary value; the pearl oyster, from which commercial pearls are harvested, is of a different family.

Unlike most bivalves, whose shells are aragonite, adult eastern oysters have calcite shells. The larvae, however, retain the aragonite shell of their ancestors. The specific gravity of the two types of shell is similar, so neither would confer a weight advantage over the other for a freely swimming larva.[16] The transition to the thicker calcite shell in the adult of this species is thought to be an adaptation for defense against predators because the oysters are immobilized in exposed locations.[16]

Life cycle

The life cycle of C. virginica consists of spawn, floating fertilized egg, trochophore, swimming straight-hinge veliger, swimming late veliger, swimming and crawling pediveliger, early spat, later spat, and adult oysters.[17] Spawning of C. virginica is controlled by water temperatures and varies from north to south; northern oysters spawn at temperatures between 60 and 68 °F (15.5 and 20 °C), whereas southern oysters spawn at temperatures above 68 °F (20 °C). Spawning can occur throughout the warm months.[18]

Eastern oysters can reach sexual maturity at four months old in southern waters.[19] The eastern oyster's reproductive cycle begins during late summer and autumn months with the storage of glycogen energy reserves.[20] This glycogen is then used to support gametogenesis during the next winter and early spring when food intake is at a minimum.[20] The gametes begin to mature in late spring and then, from June to August, they are spawned into the water column, where fertilization occurs.[20] Each female produces from 75 to 150 million eggs, but only one in a thousand survives.[21] Fertilized eggs develop in about six hours into planktonic, free-swimming, trochophore larvae, also known as the early umbo stage, which have cilia and a small shell.[17] The trochophore larvae depend on their internal yolk supply for energy.[22] They then develop within 12 to 24 hours into a fully shelled veliger larvae, also known as the late umbo stage, which has a hinged side and a velum.[17] During this time, the shelled veliger larvae use their ciliated vela to capture food and swim.[22] The larvae remain planktonic for about 2 to 3 weeks, depending on food and temperature conditions, and towards the end of this period, they develop into pediveliger larvae, also known as eyed larvae, which have an umbo, an eyespot, and a foot.[17] During this time. the pediveliger larvae settle to the bottom, where they seek a hard substrate.[17] Ideally, the pediveliger larvae try to locate an adult oyster shell to which they attach, often as part of an existing oyster reef, but other hard surfaces will suffice. Upon settling, a larva cements its left valve to the substrate and metamorphoses into an oyster spat by discarding its velum, reabsorbing its foot, and enlarging its gills.[22] During the first year of life, C. virginica oysters are protandric. Most spat are male, but once they reach sexual maturity, some males change to females after the first or second spawning.[18] Some females may change back to males again.[18]

History of the Chesapeake Bay oyster

Before industrial harvesting

Before Columbus and the rise of industrial oyster operations, oysters abounded in the bay. Oysters first arrived in the Chesapeake 5,000 years ago, and shortly after, local Indians began eating them. Archaeologists found evidence the local Native Americans returned to the same place to collect oysters for 3,000 years. John Smith, on a voyage up the Chesapeake, stated oysters "lay as thick as stones."[23] In fact, the word Chesapeake derives from an Algonquian word meaning 'Great Shellfish Bay'.[24] Because of the abundance of oysters filtering the waters of the Chesapeake, the water was much clearer than it is now. Visibility would sometimes reach 20 feet. When the English began settling the area, they evidently had a localized impact of the oyster population. One archaeological site measured oyster sizes near Maryland's old capital St. Mary's city from 1640 to 1710. In 1640, when the city was still small, oysters measured 80 mm, and in the city's maximum population in 1690, they measured to 40 mm. When the capital moved to Annapolis, the population moved with it, and by 1710, the oysters were back up to 80 mm.[25] However, the effect of overharvesting would remain local until after the Civil War, when a combination of new technologies led to the removal of nearly all the bay oysters.

Industrial oyster harvesting

During the industrial revolution, several new technologies were introduced to the Chesapeake Bay area which allowed for more intensive oyster harvesting. First was the invention of canning. This allowed oysters to be preserved much longer, and created demand for oysters across the world. Secondly, the invention of the dredge enabled oyster harvesters to reach untouched depths of the Chesapeake. And finally, the proliferation of steam-powered ships and railroads made transportation more reliable, enabling merchants to sell oysters far and wide. Estimates for the harvest in 1839 give a figure of 700,000 bushels. After the Civil War, dredges were legalized, and harvesting exploded to 5 million bushels that year. By 1875, 17 million bushels were taken from the bay. The harvesting would reach its peak in the 1880s, with 20 million bushels being harvested from the bay each year.[25] Not only were they being taken for food, but also oyster reefs, where oysters had built hills of their dead shells over thousands of generations, were being dredged out. Surplus oyster shells had many uses then. They were ground into mortar, used as filler in roads, and as a source of lime in agricultural fertilizer. By the 1920s, harvests would be down to just 3–5 million bushels per year because of overharvesting.

Decline and disease

Overharvesting eventually depleted the remaining oyster population in the bay to just 1% of its historical level, where it stands today. Oyster harvests began to decline in the 1890s. They were being taken much faster than they could reproduce. Also, many of the shells and reefs were being taken and not being replaced. Oyster spat need a hard surface on which to attach, and these were vanishing because of the destruction of oyster reefs. By the 1920s, harvests were down to 3–5 million bushels per year,[25] stabilized for a time by returning oyster shells back to the bay. But in the 1950s, the weakened oyster population had to deal with the diseases "dermo" and MSX. These decimated the remaining oyster population. The parasites which carried the disease are alien to eastern waters, and they were thought to have been brought to the Chesapeake by Asian oysters. Currently, oyster harvests average less than 200,000 bushels a year.

Commercial value

The eastern oyster used to be of great commercial value. Due to the steep decline in the number of oysters in various traditionally harvested areas, primarily because of overfishing and diseases,[26] the annual catch has declined significantly. In Maryland, the 2006–2007 catch was 165,059 bushels (about 7600 m³) of oysters.[27] Other regions of the East Coast of the United States have successful oyster farms, including most notably Cotuit , Martha's Vineyard and Wellfleet, Massachusetts, on Cape Cod.

Effects of the BP Deepwater Horizon oil spill

Harvestable size of a C. virginica oyster is 75 mm (3.0 in), which can take from 12 to 36 months, depending on temperature, salinity of the water, and food supply.[18] Salinity is a very important climatological variable that affects spatfall. Oysters do best where salinities range from 10 to 30 ppt; the range of 15 to 18 ppt is considered optimal.[18] Typically, when salinity levels are less than 6 ppt, larvae will not settle and metamorphose into spat.[28] In 2010, 665 miles of coastline were affected by the Deepwater Horizon oil spill.[29] To keep the oil at bay and to spare the oystermen, the authorities of Louisiana made an unprecedented decision to maximize the fresh water flow through the region's canals to three times usual levels.[21] At the mouth of the canals, salinity fell to almost zero, which was probably why most of the oysters died.[21] Sujata Gupta ventured into the marshlands and Gulf of Mexico with Brad Robin, a man from a line of generations of oystermen in southeastern Louisiana. Robin and his crew threw a net over the side to haul in a catch.[21] There were dozens of palm-sized oysters, but 75% of them were "boxes" or empty shells.[21] However, as they traveled further towards the Gulf of Mexico, where the water was less salinity-stressed by the flush, only 20% of the haul came back as boxes, a promising sign the oysters are trying to come back.[21] Gupta reported, "Now since there are so many empty shells scattered on the sea floor, the larvae have more to latch onto, improving their odds".[21] However, salinity levels are not the only concern. Eastern oysters are filter feeders, so they are greatly affected by their surroundings since they are sessile organisms. This means if the water around them was contaminated with oil and the dispersant used to get rid of the oil, then these chemicals were collected by the oysters as they filtered the water.[30] This is cause for great concern that the oysters are being killed by the toxins in the dispersant, as well.[30] An added dilemma is oysters are in their weakest state after spawning season, which may have caused some of them to close their shells, resulting in death by suffocation within just a few days due to warm temperatures in the Gulf if the shells remain closed.[30] The toxins in the oil and dispersants can also kill the larvae.[30] To highlight the recovery of the state's oyster industry, the shell of C. virginica cut into cabochons was made Louisiana's official state gem in 2011.[31][32]

Diseases

"Dermo" (Perkinsus marinus) is a marine disease of oysters, caused by a protozoan parasite. It is a prevalent pathogen of oysters, causing massive mortality in oyster populations, and poses a significant economic threat to the oyster industry.

Multinucleated sphere X (MSX) (Haplosporidium nelsoni), another protozoan, was first described along the mid-Atlantic coast in 1957.[33] Mortalities can reach 90% to 95% of the oyster population within 2 to 3 years of being seeded.[34] MSX slows the feeding rates of infected oysters, leading to a reduction in the amount of stored carbohydrates, which in turn inhibits normal gametogenesis during spawning, resulting in reduced fecundity.

Recognition

The eastern oyster is the state shellfish of Connecticut,[35] its shell is the state shell of Virginia and Mississippi, and its shell in cabochon form is the state gem of Louisiana.[31]

References

Citations

  1. ^ a b NatureServe (6 January 2023). "Crassostrea virginica". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 28 January 2023.
  2. ^ "Crassostrea virginica (Gmelin, 1791)". Global Biodiversity Information Facility. Retrieved 2 February 2023.
  3. ^ "What Makes Wellfleet Oysters Special?". Wellfleet OysterFest. Retrieved April 16, 2015.
  4. ^ McMurray, Patrick (2002). "Guidebook of Introduced Marines Species of Hawaii". Bishop Museum and University of Hawaii.
  5. ^ "Crassostrea virginica". National Estuarine and Marine Exotic Species Information System. Smithsonian Environmental Research Center. Retrieved 2 February 2023.
  6. ^ Carriker, Melbourne R.; Gaffney, Patrick M. (1996). "Chapter 1: A Catalogue of Selected Species of Living Oyster (Ostreacea) of the World". In Kennedy, Victor S.; Newell, Roger I.E.; Eble, Albert F. (eds.). The Eastern Oyster: Crassotrea virginica. College Park: Maryland Sea Grant College. pp. 1–18. ISBN 0-943-676-61-4. LCCN 96-076817. Retrieved 2 February 2023 – via NOAA Institutional Repository.
  7. ^ Apple Jr., R.W. (2006-04-26). "The Oyster Is His World". The New York Times. Retrieved 2006-04-27.
  8. ^ "Crassostrea virginica, Introduced Marine Species of Hawaii Guidebook". www2.bishopmuseum.org. Retrieved 2021-01-01.
  9. ^ Newell, R.I.E. (August 1988) [Proceedings of a Conference, 29-31 March 1988, Baltimore, Maryland]. "Ecological Changes in Chesapeake Bay: Are They The Result of Overharvesting the American Oyster, Crassostrea virginica?". In Lynch, M.P.; Krome, E.C. (eds.). Understanding the Estuary: Advances in Chesapeake Bay Research. Solomons, Maryland: Chesapeake Research Consortium. pp. 536–546. CRC Publication No. 129, CBP/TRS 24/88. Retrieved 29 January 2023 – via National Service Center for Environmental Publications, United States Environmental Protection Agency.
  10. ^ Eastern Oyster Biological Review Team (March 2007). Status review of the eastern oyster (Crassostrea virginica). Report to the National Marine Fisheries Service, Northeast Regional Office. February 16, 2007 (Report). National Oceanic and Atmospheric Administration. Tech Memo NMFS-F/SPO-88. Retrieved 28 January 2023.
  11. ^ "Field Guide: Eastern Oyster Crassotrea virginica". Chesapeake Bay Program. Chesapeake Bay Program. 2023. Retrieved 29 January 2023.
  12. ^ Tomanek, L.; Zuzow, M.J.; Ivanina, A.V.; Beniash, E.; Sokolova, I.M. (2011). "Proteomic response to elevated PCO2 level in eastern oysters, Crassostrea virginica: evidence for oxidative stress". Journal of Experimental Biology. 214 (11): 1836–1844. doi:10.1242/jeb.055475. PMID 21562170.
  13. ^ Gutiérrez, J. L.; Jones, C.G.; Stayer, D.L.; Iribarne, O.O. (2003). "Mollusks as ecosystem engineers: the role of shell production in aquatic habitats". Oikos. 101 (1): 79–90. doi:10.1034/j.1600-0706.2003.12322.x.
  14. ^ "Crassostrea virginica". Indian River Lagoon Species Inventory. Smithsonian Marine Station at Fort Pierce and Indian River Lagoon National Estuary Program. Retrieved 29 January 2023.
  15. ^ "Aquatic Reefs". About the Bay. Chesapeake Bay Program. Archived from the original on 7 December 2011. Retrieved 6 December 2011.
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Eastern oyster: Brief Summary

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The eastern oyster (Crassostrea virginica)—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 Point oyster, Chesapeake Bay oyster, and Apalachicola oyster. C. virginica ranges from northern New Brunswick south through parts of the West Indies to Venezuela.: 7  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 nineteenth century and is common in Pearl Harbor.

The eastern oyster is an important commercial species. Its distribution has been affected by habitat change; less than 1% of the population present when the first European colonists arrived is thought to remain in the Chesapeake Bay and its tributaries. As of 2014, the global conservation status of Crassostrea virginica, as assessed by NatureServe, is "vulnerable," as the oyster's populations are threatened by overharvest and water pollution. Other threats to the eastern oyster include global warming, diseases and parasites and competition with invasive species.

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Distribution

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Gulf of St. Lawrence (unspecified region), southern Gaspe waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: Eastern Bradelle valley), Magdalen Islands (from eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel); Prince Edward Island (from the northern tip of Miscou Island, N.B. to Cape Breton Island south of Cheticamp, including the Northumberland Strait and Georges Bay to the Canso Strait causeway); West Indies

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North-West Atlantic Ocean species (NWARMS)

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Habitat

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infralittoral of the Gulf and estuary

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North-West Atlantic Ocean species (NWARMS)

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