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Hard clam

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Hard clam
LittleNeck clams USDA96c1862.jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Venerida
Superfamily: Veneroidea
Family: Veneridae
Genus: Mercenaria
Species:
M. mercenaria
Binomial name
Mercenaria mercenaria

The hard clam (Mercenaria mercenaria), also known as the round clam, hard-shell (or hard-shelled) clam, or the quahog,[a] 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.

Confusingly, the "ocean quahog" is a different species, Arctica islandica, which, although superficially similar in shape, is in a different family of bivalves: it is rounder than the hard clam, usually has black periostracum, and there is no pallial sinus in the interior of the shell.

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Mercenaria

Mercenaria

Mercenaria is a genus of edible saltwater clams, marine bivalve molluscs in the family Veneridae, the Venus clams.

North America

North America

North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Caribbean Sea, and to the west and south by the Pacific Ocean. Because it is on the North American Tectonic Plate, Greenland is included as a part of North America geographically.

Central America

Central America

Central America is a subregion of the Americas. Its boundaries are defined as bordering Mexico to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. Central America usually consists of seven countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama. Within Central America is the Mesoamerican biodiversity hotspot, which extends from northern Guatemala to central Panama. Due to the presence of several active geologic faults and the Central America Volcanic Arc, there is a high amount of seismic activity in the region, such as volcanic eruptions and earthquakes which has resulted in death, injury, and property damage.

Prince Edward Island

Prince Edward Island

Prince Edward Island is one of the thirteen provinces and territories of Canada. It is the smallest province in terms of land area and population, but the most densely populated. The island has several nicknames: "Garden of the Gulf", "Birthplace of Confederation" and "Cradle of Confederation". Its capital and largest city is Charlottetown. It is one of the three Maritime provinces and one of the four Atlantic provinces.

Yucatán Peninsula

Yucatán Peninsula

The Yucatán Peninsula is a large peninsula in southeast Mexico and adjacent portions of Belize and Guatemala. The peninsula extends towards the northeast, separating the Gulf of Mexico to the north and west of the peninsula from the Caribbean Sea to the east. The Yucatán Channel, between the northeastern corner of the peninsula and Cuba, connects the two bodies of water.

Clam

Clam

Clam is a common name for several kinds of bivalve molluscs. 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 seafloor 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.

Veneridae

Veneridae

The Veneridae or venerids, common name: Venus clams, are a very large family of minute to large, saltwater clams, marine bivalve molluscs. Over 500 living species of venerid bivalves are known, most of which are edible, and many of which are exploited as food sources.

Arctica islandica

Arctica islandica

The ocean quahog is a species of edible clam, a marine bivalve mollusk in the family Arcticidae. This species is native to the North Atlantic Ocean, and it is harvested commercially as a food source. This species is also known by a number of different common names, including Icelandic cyprine, mahogany clam, mahogany quahog, black quahog, and black clam.

Periostracum

Periostracum

The periostracum is a thin, organic coating that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods. Among molluscs, it is primarily seen in snails and clams, i.e. in gastropods and bivalves, but it is also found in cephalopods such as Allonautilus scrobiculatus. The periostracum is an integral part of the shell, and it forms as the shell forms, along with the other shell layers. The periostracum is used to protect the organism from corrosion.

Pallial sinus

Pallial sinus

The pallial sinus is an indentation or inward bending in the pallial line on the interior of a bivalve mollusk shell's valves that corresponds to the position of the siphons in those types of clams which have siphons. The position of the pallial sinus is often clearly visible as a shiny line on the inside of the bivalve shell.

Alternative names

Left valve interior of Mercenaria mercenaria.
Left valve interior of Mercenaria mercenaria.

The hard clam has many alternative common names. It is also known as the Northern quahog, round clam, or chowder clam.[1]

In fish markets, there are specialist names for different sizes of this species of clam. The smallest legally harvestable clams are called countnecks or peanuts, next size up are littlenecks, then topnecks. Above that are the cherrystones, and the largest are called quahogs or chowder clams.[2]

The most distinctive of these names is quahog (/ˈkhɒɡ/ KOH-hog, /ˈkwɔːhɒɡ/ KWAW-hog, or /kwəˈhɒɡ/ kwə-HOG, also spelt quahaug, quohog or cohog).[3][4] The word comes from the Narragansett word "poquauhock", which is similar in Wampanoag and some other Algonquian languages; it is first attested in North American English in 1794.[5][6] Native polities on the eastern Atlantic seaboard made valuable beads called wampum from the shells, especially those colored purple; the species name mercenaria is related to the Latin word for commerce. Today people living in coastal New England still use Algonquian words for the clam, as they have done for thousands of years.

In many areas where aquaculture is important, clam farmers have bred specialized versions of these clams with distinctions needed for them to be distinguished in the marketplace. These are quite similar to common "wild type" Mercenaria clams, except that their shells bear distinctive markings. These are known as the notata strain of quahogs, which occur naturally in low numbers wherever quahogs are found.[7]

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Common name

Common name

In biology, a common name of a taxon or organism is a name that is based on the normal language of everyday life; and is often contrasted with the scientific name for the same organism, which is Latinized. A common name is sometimes frequently used, but that is not always the case.

Narragansett language

Narragansett language

Narragansett is an Algonquian language formerly spoken in most of what is today Rhode Island by the Narragansett people. It was closely related to the other Algonquian languages of southern New England like Massachusett and Mohegan-Pequot. The earliest study of the language in English was by Roger Williams, founder of the Rhode Island colony, in his book A Key Into the Language of America (1643).

Algonquian languages

Algonquian languages

The Algonquian languages are a subfamily of Indigenous American languages that include most languages in the Algic language family. The name of the Algonquian language family is distinguished from the orthographically similar Algonquin dialect of the Indigenous Ojibwe language (Chippewa), which is a senior member of the Algonquian language family. The term Algonquin has been suggested to derive from the Maliseet word elakómkwik, "they are our relatives/allies". A number of Algonquian languages are considered extinct languages by the modern linguistic definition.

Wampum

Wampum

Wampum is a traditional shell bead of the Eastern Woodlands tribes of Native Americans. It includes white shell beads hand-fashioned from the North Atlantic channeled whelk shell and white and purple beads made from the quahog or Western North Atlantic hard-shelled clam.

Latin

Latin

Latin is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area around present-day Rome, but through the power of the Roman Republic it became the dominant language in the Italian region and subsequently throughout the Roman Empire. Even after the fall of Western Rome, Latin remained the common language of international communication, science, scholarship and academia in Europe until well into the 18th century, when other regional vernaculars supplanted it in common academic and political usage, and it eventually became a dead language in the modern linguistic definition.

Aquaculture

Aquaculture

Aquaculture, also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants. Aquaculture involves cultivating freshwater, brackish water and saltwater populations under controlled or semi-natural conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish. Mariculture, commonly known as marine farming, refers specifically to aquaculture practiced in seawater habitats and lagoons, as opposed to freshwater aquaculture. Pisciculture is a type of aquaculture that consists of fish farming to obtain fish products as food.

Distribution

An old quahog shell that has been bored (producing Entobia) and encrusted after the death of the clam
An old quahog shell that has been bored (producing Entobia) and encrusted after the death of the clam

Hard clams are quite common throughout New England, north into Canada, and all down the Eastern seaboard of the United States to Florida; but they are particularly abundant between Cape Cod and New Jersey, where seeding and harvesting them is an important commercial form of aquaculture. For example, the species is an important member of the suspension-feeding, benthic fauna of the lower Chesapeake Bay.

Rhode Island is situated right in the middle of "quahog country" and has supplied a quarter of the U.S.'s total annual commercial quahog catch. The quahog is the official shellfish of the U.S. state of Rhode Island. The species has also been introduced and is farmed on the Pacific coast of North America and in Great Britain and continental Europe. It reproduces sexually by females and males shedding gametes into the water.[2]

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Bioerosion

Bioerosion

Bioerosion describes the breakdown of hard ocean substrates – and less often terrestrial substrates – by living organisms. Marine bioerosion can be caused by mollusks, polychaete worms, phoronids, sponges, crustaceans, echinoids, and fish; it can occur on coastlines, on coral reefs, and on ships; its mechanisms include biotic boring, drilling, rasping, and scraping. On dry land, bioerosion is typically performed by pioneer plants or plant-like organisms such as lichen, and mostly chemical or mechanical in nature.

Entobia

Entobia

Entobia is a trace fossil in a hard substrate formed by sponges as a branching network of galleries, often with regular enlargements termed chambers. Apertural canals connect the outer surface of the substrate to the chambers and galleries so the sponge can channel water through its tissues for filter feeding. The fossil ranges from the Devonian to the Recent.

Canada

Canada

Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's second-largest country by total area, with the world's longest coastline. Its southern and western border with the United States is the world's longest binational land border. Canada's capital is Ottawa and its three largest metropolitan areas are Toronto, Montreal, and Vancouver.

East Coast of the United States

East Coast of the United States

The East Coast of the United States, also known as the Eastern Seaboard, the Atlantic Coast, and the Atlantic Seaboard, is the coastline where the Eastern United States meets the North Atlantic Ocean. This region includes Connecticut, Delaware, Florida, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New York, New Jersey, North Carolina, Pennsylvania, Rhode Island, South Carolina, Vermont, Virginia, West Virginia, and the federal capital of Washington, D.C..

Florida

Florida

Florida is a state in the Southeastern region of the United States, bordered to the west by the Gulf of Mexico; Alabama to the northwest; Georgia to the north; the Bahamas and Atlantic Ocean to the east; and the Straits of Florida and Cuba to the south. It is the only state that borders both the Gulf of Mexico and the Atlantic Ocean. With a population exceeding 21 million, it is the third-most populous state in the nation as of 2020. It spans 65,758 square miles (170,310 km2), ranking 22nd in area among the 50 states. The Miami metropolitan area, anchored by the cities of Miami, Fort Lauderdale, and West Palm Beach, is the state's largest metropolitan area with a population of 6.138 million, and the state's most-populous city is Jacksonville with a population of 949,611. Florida's other major population centers include Tampa Bay, Orlando, Cape Coral, and the state capital of Tallahassee.

Cape Cod

Cape Cod

Cape Cod is a peninsula extending into the Atlantic Ocean from the southeastern corner of mainland Massachusetts, in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. The name Cape Cod, coined in 1602 by Bartholomew Gosnold, is the ninth oldest English place-name in the U.S.

Aquaculture

Aquaculture

Aquaculture, also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants. Aquaculture involves cultivating freshwater, brackish water and saltwater populations under controlled or semi-natural conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish. Mariculture, commonly known as marine farming, refers specifically to aquaculture practiced in seawater habitats and lagoons, as opposed to freshwater aquaculture. Pisciculture is a type of aquaculture that consists of fish farming to obtain fish products as food.

Chesapeake Bay

Chesapeake Bay

The Chesapeake Bay is the largest estuary in the United States. The Bay is located in the Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula, including parts of the Eastern Shore of Maryland, the Eastern Shore of Virginia, and the state of Delaware. The mouth of the Bay at its southern point is located between Cape Henry and Cape Charles. With its northern portion in Maryland and the southern part in Virginia, the Chesapeake Bay is a very important feature for the ecology and economy of those two states, as well as others surrounding within its watershed. More than 150 major rivers and streams flow into the Bay's 64,299-square-mile (166,534 km2) drainage basin, which covers parts of six states and all of District of Columbia.

List of U.S. state shells

List of U.S. state shells

This is a list of official state shells for those states of the United States that have chosen to select one as part of their state insignia. In 1965, North Carolina was the first state to designate an official state shell, the Scotch bonnet. Since then, 14 other states have designated an official state shell.

Introduced species

Introduced species

An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are considered naturalized. The process of human-caused introduction is distinguished from biological colonization, in which species spread to new areas through "natural" (non-human) means such as storms and rafting. The Latin expression neobiota captures the characteristic that these species are new biota to their environment in terms of established biological network relationships. Neobiota can further be divided into neozoa and neophyta (plants).

Great Britain

Great Britain

Great Britain is an island in the North Atlantic Ocean off the north-west coast of continental Europe. With an area of 209,331 km2 (80,823 sq mi), it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It is dominated by a maritime climate with narrow temperature differences between seasons. The 60% smaller island of Ireland is to the west—these islands, along with over 1,000 smaller surrounding islands and named substantial rocks, form the British Isles archipelago.

Europe

Europe

Europe is a continent comprising the westernmost peninsulas of Eurasia, located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It shares the continental landmass of Afro-Eurasia with both Africa and Asia. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east. Europe is commonly considered to be separated from Asia by the watershed of the Ural Mountains, the Ural River, the Caspian Sea, the Greater Caucasus, the Black Sea and the waterways of the Turkish Straits.

Parasite

Quahog parasite unknown (QPX)[8] is a parasite that affects the hard shell clam Mercenaria mercenaria. While little is known about the disease, research is currently under way in several laboratories.[9] This research is fueled by the need to inform aquaculturists, who suffer financially because of the mortality rates in clams that QPX inflicts and the ensuing years in which runs must be left fallow to clear the disease. It was discovered along the coast of Cape Cod, Massachusetts in 1995.

Quahog parasite X (or quahog parasite unknown [QPX]) disease of the hard clam Mercenaria mercenaria is caused by a poorly known protistan parasite. Its DNA sequence analysis places the QPX parasite among the thraustochytrid stramenopiles. Thraustochytrids are common protists in marine sediments and the water column, but only a few thraustochytrids are known as parasites of marine animals. Although QPX disease was first recorded on the Atlantic coast of Canada in the early 1960s, it did not become a major economic problem until its appearance in cultured clams at Prince Edward Island, Massachusetts in 1992, and Virginia in 1997. Infected clams are characterized by the presence of blisters or pustules in the mantle and later by gaping and death.[10]

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Human use

Steamed clams
Steamed clams
Raw top neck clams in New Jersey.
Raw top neck clams in New Jersey.

In coastal areas of the New England states, Long Island, and New Jersey, restaurants known as raw bars or clam bars specialize in serving littlenecks and topnecks raw on an opened half-shell, usually with a cocktail sauce with horseradish, and often with lemon. Sometimes littlenecks are steamed and dipped in butter, though not as commonly as their soft-shelled clam cousin the "steamer". Littlenecks are often found in-the-shell in sauces, soups, stews, and clams casino, or substituted for European varieties such as the cockle in southern European seafood dishes. The largest clams are quahogs or chowders and cherrystones; they have the toughest meat and are used in such dishes as clam chowder, clam cakes, and stuffed clams, or are minced and mixed into dishes that use the smaller, more tender clams.

Historically, Native Americans used the quahog as a component in wampum, the shell beads exchanged in the North American fur trade.[11] The Narragansetts used the hard clam for food and ornaments.[12]

A population of hard clams exists in Southampton Water in Hampshire, England. Originally bred in the warm water outflows at Southampton Power Station for use as eel bait, the population became self-sustaining and can now be found in Southampton Water and has also spread to Portsmouth Harbour and Langstone Harbour.

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New Jersey

New Jersey

New Jersey is the most densely populated U.S. state. A coastal state, New Jersey is situated at the center of the Northeast megalopolis, the most populous American urban agglomeration. The state lies within both the Mid-Atlantic and Northeastern regions of the United States. New Jersey is bordered on its north and east by the state of New York; on its east, southeast, and south by the Atlantic Ocean; on its west by the Delaware River and Pennsylvania; and on its southwest by Delaware Bay and the state of Delaware. At 7,354 square miles (19,050 km2), New Jersey is the fifth-smallest state in land area, but with close to 9.3 million residents as of the 2020 United States census, its highest decennial count ever, ranks 11th in population. The state capital is Trenton, and the most populous city is Newark. New Jersey is the only U.S. state in which every county is deemed urban by the U.S. Census Bureau, with 13 counties included in the New York metropolitan area, seven counties in the Philadelphia metropolitan area, and with Warren County constituting part of the rapidly industrializing Lehigh Valley metropolitan area.

Cocktail sauce

Cocktail sauce

Cocktail sauce, also known as seafood sauce, is one of several types of cold or room temperature sauces often served as part of a dish referred to as a seafood cocktail or as a condiment with other seafoods. The sauce, and the dish for which it is named, are often credited to British celebrity chef Fanny Cradock, but seafood cocktails predate her 1967 recipe by some years.

Horseradish

Horseradish

Horseradish is a perennial plant of the family Brassicaceae. It is a root vegetable, cultivated and used worldwide as a spice and as a condiment. The species is probably native to southeastern Europe and western Asia.

Lemon

Lemon

The lemon is a species of small evergreen trees in the flowering plant family Rutaceae, native to Asia, primarily Northeast India (Assam), Northern Myanmar or China.

Clams casino

Clams casino

Clams casino is a clam "on the halfshell" dish with breadcrumbs and bacon. Green peppers are also a common ingredient.

Cockle (bivalve)

Cockle (bivalve)

A cockle is an edible marine bivalve mollusc. Although many small edible bivalves are loosely called cockles, true cockles are species in the family Cardiidae.

Clam chowder

Clam chowder

Clam chowder is any of several chowder soups in American cuisine containing clams. In addition to clams, common ingredients include diced potatoes, salt pork, and onions. Other vegetables are not typically used. It is believed that clams were used in chowder because of the relative ease of harvesting them. Clam chowder is usually served with saltine crackers or small, hexagonal oyster crackers.

Indigenous peoples of the Americas

Indigenous peoples of the Americas

The Indigenous peoples of the Americas are the inhabitants of the Americas before the arrival of the European settlers in the 15th century, and the ethnic groups who now identify themselves with those peoples.

North American fur trade

North American fur trade

The North American fur trade is the commercial trade in furs in North America. Various Indigenous peoples of the Americas traded furs with other tribes during the pre-Columbian era. Europeans started their participation in the North American fur trade from the initial period of their colonization of the Americas onward, extending the trade's reach to Europe. European merchants from France, England and the Dutch Republic established trading posts and forts in various regions of North America to conduct the trade with local Indigenous communities. The trade reached the peak of its economic importance in the 19th century, by which time it relied upon elaborately developed trade networks.

Hampshire

Hampshire

Hampshire is a ceremonial and non-metropolitan county in western South East England on the coast of the English Channel. Home to approximately 1.9 million people, Hampshire is the 5th-most populous county in England. Its largest settlements are the cities of Southampton and Portsmouth. The county town is Winchester. It is bordered by Berkshire to the north, Surrey to the north-east, Wiltshire to the north-west, West Sussex to the south-east, and Dorset to the south-west. The county contains two national parks: the New Forest and part of the South Downs, which together cover 45 per cent of Hampshire.

England

England

England is a country that is part of the United Kingdom. It shares land borders with Wales to its west and Scotland to its north. The Irish Sea lies northwest and the Celtic Sea area of the Atlantic Ocean to the southwest. It is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight.

Portsmouth Harbour

Portsmouth Harbour

Portsmouth Harbour is a 1,264.2-hectare (3,124-acre) biological Site of Special Scientific Interest between Portsmouth and Gosport in Hampshire. It is a Ramsar site and a Special Protection Area.

Clams and red tide

The term "red tide" refers to an accumulation of a toxin, such as saxitoxin, produced by marine algae.[13][14] Filter-feeding shellfish are affected, such as clams, oysters, and mussels.[13][14] The toxin affects the human central nervous system.[13] Eating contaminated shellfish, raw or cooked, can be fatal.[13] Some other kinds of algal blooms make the seawater appear red, but red tide blooms do not always discolor the water, nor are they related to tides.[13]

Source: "Hard clam", Wikipedia, Wikimedia Foundation, (2023, March 15th), https://en.wikipedia.org/wiki/Hard_clam.

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Notes
  1. ^ For the pronunciation and variant spellings of quahog, as well as for other alternative common names, see the appropriate section.
References
  1. ^ Harte, M. E. 2001. "Systematics and taxonomy, Chapter 1", pp. 3–51, in Kraeuter, J. N. and M. Castagna (eds.) "Biology of the Hard Clam", Developments in Aquaculture and Fisheries Science, Vol. 31. Elsevier Science B.V.: New York.
  2. ^ a b Rice, M.A. (1992). The Northern Quahog: Biology of Mercenaria mercenaria. Rhode Island Sea Grant Publication No. RIU-B-92-001, University of Rhode Island, Narragansett. 60 pp. ISBN 0-938412-33-7 web link.
  3. ^ "quahog". The Chambers Dictionary (9th ed.). Chambers. 2003. ISBN 0-550-10105-5.
  4. ^ "quahog". Collins English Dictionary (13th ed.). HarperCollins. 2018. ISBN 0-008-28437-7.
  5. ^ "Quahaug, quahog", in Shorter Oxford English Dictionary, 3rd ed (Oxford: Clarendon Press, 1973)
  6. ^ Roger Williams, A Key Into the Language of America. London: Gregory Dexter, 1643.
  7. ^ Eldridge, P.J., W. Waltz, and H. Mills. 1975. Relative abundance of Mercenaria mercenaria notata in estuaries of South Carolina. Veliger 18:396-397.
  8. ^ "QPX". Marine Symbiosis.
  9. ^ Calvo, LMR; Ford, S. E.; Kraeuter, J. N.; Leavitt, D. F.; Smolowitz, R.; Burreson, E. M. (1 January 2007). "Influence Of Host Genetic Origin And Geographic Location On Qpx Disease In Northern Quahogs (=Hard Clams), Mercenaria Mercenaria". Journal of Shellfish Research. 26: 109–119. doi:10.2983/0730-8000(2007)26[109:IOHGOA]2.0.CO;2.
  10. ^ Dove, Alistair; Bowser (28 September 2020) [9 January 2011]. "Histological Analysis of an Outbreak of QPX Disease in Wild Hard Clams Mercenaria mercenaria in New York". Journal of Aquatic Animal Health. 16 (4): 246–250. doi:10.1577/H03-052.1.
  11. ^ White, Richard (1991). The Middle Ground: Indians, Empires, and Republics in the Great Lakes Region, 1650–1815 (2nd ed.). New York: Cambridge University Press. p. 97. ISBN 9781139495684. OCLC 772696326.
  12. ^ Feeney, Kathy (2003). Rhode Island Facts and Symbols. Albert T. Klyberg (consultant) (Revised and Updated ed.). Mankato, Minn.: Capstone Press. pp. 18–19. ISBN 9780736822701. OCLC 51204649.
  13. ^ a b c d e "Paralytic Shellfish Poisoning". Washington State Department of Health. 2020. Retrieved 10 August 2020.
  14. ^ a b "Paralytic Shellfish Poisoning". Centre for Disease Control, British Columbia Health Services Authority. 2020. Retrieved 10 August 2020.

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