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Common cockle

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Common cockle
Coque blanche (Cerastoderma edule).jpg
Scientific classification edit
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Cardiida
Family: Cardiidae
Genus: Cerastoderma
Species:
C. edule
Binomial name
Cerastoderma edule
Synonyms
  • Cardium belgicum De Malzine, 1867
  • Cardium crenulatum Lamarck, 1819
  • Cardium edule Linnaeus, 1758 (basionym)
  • Cardium edule burchanae Girscher, 1938
  • Cardium edule var. batesoni Bucquoy, Dautzenberg & Dollfus, 1892
  • Cardium edule var. loppensi Mars, 1951
  • Cardium edule var. major Bucquoy, Dautzenberg & Dollfus, 1892
  • Cardium mercatorium Coen, 1915
  • Cardium nunninkae Lucas, 1984
  • Cardium obtritum Locard, 1886
  • Cardium quadrarium Reeve, 1845
  • Cardium vulgare Da Costa, 1778
  • Cerastoderma edule var. sinicola Lacourt, 1974
  • Cerastoderma nunninkae Lucas, 1984

The common cockle (Cerastoderma edule) is a species of edible saltwater clam, a marine bivalve mollusc in the family Cardiidae, the cockles. It is found in waters off Europe, from Iceland in the north, south into waters off western Africa as far south as Senegal. The ribbed oval shells can reach 6 centimetres (2.4 in) across and are white, yellowish or brown in colour. The common cockle is harvested commercially and eaten in much of its range.

Taxonomy and naming

Cerastoderma edule a) foot b) exhalant siphon c) branchial or inhalant siphon d) edge of mantle e) ligament f) umbones or beaks of the shell
Cerastoderma edule a) foot b) exhalant siphon c) branchial or inhalant siphon d) edge of mantle e) ligament f) umbones or beaks of the shell

The common cockle was one of the many invertebrate species originally described by Carl Linnaeus in the landmark 1758 10th edition of Systema Naturae, where it was given its old binomial name Cardium edule.[2] The species name is derived from the Latin adjective ĕdūlis "edible".[3] Italian naturalist Giuseppe Saverio Poli erected the genus Cerastoderma in 1795, making the common cockle the type species as Cerastoderma edule.[4] The genus name is derived from the Ancient Greek words keras "horn" and derma "skin".[5] For many years it was referred to by both names.[4]

Other common names in English are edible cockle and common edible cockle.[1] On account of its heart-like shape, it is called the "heart mussel" in German and Scandinavian languages (Hertzmuschel and Hjertemusling, respectively).[6]

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Vermes in the 10th edition of Systema Naturae

Vermes in the 10th edition of Systema Naturae

In 1758, in the 10th edition of Systema Naturae, the Swedish scientist and taxonomist Carl Linnaeus described the class "Vermes" as:Animals of slow motion, soft substance, able to increase their bulk and restore parts which have been destroyed, extremely tenacious of life, and the inhabitants of moist places. Many of them are without a distinct head, and most of them without feet. They are principally distinguished by their tentacles. By the Ancients they were not improperly called imperfect animals, as being destitute of ears, nose, head, eyes and legs; and are therefore totally distinct from Insects.

Carl Linnaeus

Carl Linnaeus

Carl Linnaeus, also known after his ennoblement in 1761 as Carl von Linné, was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern taxonomy". Many of his writings were in Latin; his name is rendered in Latin as Carolus Linnæus and, after his 1761 ennoblement, as Carolus a Linné.

10th edition of Systema Naturae

10th edition of Systema Naturae

The 10th edition of Systema Naturae is a book written by Swedish naturalist Carl Linnaeus and published in two volumes in 1758 and 1759, which marks the starting point of zoological nomenclature. In it, Linnaeus introduced binomial nomenclature for animals, something he had already done for plants in his 1753 publication of Species Plantarum.

Systema Naturae

Systema Naturae

Systema Naturae is one of the major works of the Swedish botanist, zoologist and physician Carl Linnaeus (1707–1778) and introduced the Linnaean taxonomy. Although the system, now known as binomial nomenclature, was partially developed by the Bauhin brothers, Gaspard and Johann, Linnaeus was first to use it consistently throughout his book. The first edition was published in 1735. The full title of the 10th edition (1758), which was the most important one, was Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis or translated: "System of nature through the three kingdoms of nature, according to classes, orders, genera and species, with characters, differences, synonyms, places".

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. For most of the time it was used, it would be considered a "dead language" in the modern linguistic definition; that is, it lacked native speakers, despite being used extensively and actively.

Giuseppe Saverio Poli

Giuseppe Saverio Poli

Giuseppe Saverio Poli was an Italian physicist, biologist and natural historian.

Cerastoderma

Cerastoderma

Cerastoderma is a genus of marine bivalves in the family Cardiidae. It includes the common cockle Cerastoderma edule.

Ancient Greek

Ancient Greek

Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek, Dark Ages, the Archaic period, and the Classical period.

Description

It typically reaches from 3.5 centimetres (1.4 in) to 5 centimetres (2.0 in) in length,[7] but sometimes it reaches 6 centimetres (2.4 in).[6] The shells are pale or whitish yellow, grubby white, or brown.[6][7] The shell is oval, and covered by ribs, which are flattened in the middle part of the shell. The digestive glands are light brown to dark green.[4]

In contrast, the similar lagoon cockle has an elongated shell posteriorly, black digestive glands and is found in substrate of stagnant water.[4]

Distribution and habitat

This species is found in coastal areas of the northern and eastern Atlantic Ocean. It is widely distributed from Iceland and Norway in Europe, to Senegal along the coast of west Africa.[6][7] The common cockle is one of the most abundant species of molluscs in tidal flats located in the bays and estuaries of Europe. It plays a major role as a source of food for crustaceans, fish, and wading birds.

Cerastoderma edule edule
Right and left valve of the same specimen:

Cerastoderma edule belgicum
Right and left valve of the same specimen:

Cerastoderma edule maculatum
Right and left valve:

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Coast

Coast

The coast, also known as the coastline or seashore, is defined as the area where land meets the ocean, or as a line that forms the boundary between the land and the coastline. Shores are influenced by the topography of the surrounding landscape, as well as by water induced erosion, such as waves. The geological composition of rock and soil dictates the type of shore which is created. The Earth has around 620,000 kilometres (390,000 mi) of coastline. Coasts are important zones in natural ecosystems, often home to a wide range of biodiversity. On land, they harbor important ecosystems such as freshwater or estuarine wetlands, which are important for bird populations and other terrestrial animals. In wave-protected areas they harbor saltmarshes, mangroves or seagrasses, all of which can provide nursery habitat for finfish, shellfish, and other aquatic species. Rocky shores are usually found along exposed coasts and provide habitat for a wide range of sessile animals and various kinds of seaweeds. In physical oceanography, a shore is the wider fringe that is geologically modified by the action of the body of water past and present, while the beach is at the edge of the shore, representing the intertidal zone where there is one. Along tropical coasts with clear, nutrient-poor water, coral reefs can often be found between depths of 1–50 meters.

Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about 106,460,000 km2 (41,100,000 sq mi). It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the "Old World" of Africa, Europe, and Asia from the "New World" of the Americas in the European perception of the World.

Mudflat

Mudflat

Mudflats or mud flats, also known as tidal flats or, in Ireland, slob or slobs, are coastal wetlands that form in intertidal areas where sediments have been deposited by tides or rivers. A global analysis published in 2019 suggested that tidal flat ecosystems are as extensive globally as mangroves, covering at least 127,921 km2 (49,391 sq mi) of the Earth's surface. They are found in sheltered areas such as bays, bayous, lagoons, and estuaries; they are also seen in freshwater lakes and salty lakes alike, wherein many rivers and creeks end. Mudflats may be viewed geologically as exposed layers of bay mud, resulting from deposition of estuarine silts, clays and aquatic animal detritus. Most of the sediment within a mudflat is within the intertidal zone, and thus the flat is submerged and exposed approximately twice daily.

Crustacean

Crustacean

Crustaceans belong to the subphylum Crustacea,, and form a large, diverse group of arthropods including decapods, seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods emerged deep in the Crustacean group, with the completed group referred to as Pancrustacea. Some crustaceans are more closely related to insects and the other hexapods than they are to certain other crustaceans.

Fish

Fish

Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts.

Bird

Bird

Birds are a group of warm-blooded vertebrates constituting the class Aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m common ostrich. There are about ten thousand living species, more than half of which are passerine, or "perching" birds. Birds have wings whose development varies according to species; the only known groups without wings are the extinct moa and elephant birds. Wings, which are modified forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in some birds, including ratites, penguins, and diverse endemic island species. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming.

Ecology

This species is a filter feeder, meaning that it feeds by straining water to obtain suspended matter and food particles.[8] Water is inhaled through an inhalant siphon, and exhaled through an exhalant siphon.[7]

It tolerates a wide range of salinity (euryhaline), and wide range of temperatures (eurythermic), which helps to explain its very extensive range. It has a first spawning period in early summer, and a second one in the fall. Lifespan is typically five to six years, though it may perish earlier due to predation by humans as well as crabs, flounder, and various birds especially including oystercatchers.[8] A green shore crab (Carcinus maenas) can consume up to 40 common cockles a day, eating smaller cockles (under 1.5 cm diameter) much more quickly than larger ones. Hence they could have a greater impact in lean seasons where cockles did not grow so quickly.[9]

Parasites and diseases

The cercozoan species Marteilia cochillia is a parasite of the common cockle, having caused a collapse in commercial harvests of cockle beds in Galicia in 2012. [10] A survey of cockle beds in Galicia found that infestation by the gregarine parasite Nematopsis was widespread, and that the most common pathological finding was disseminated neoplasia.[11]

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Filter feeder

Filter feeder

Filter feeders are a sub-group of suspension feeding animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. Some animals that use this method of feeding are clams, krill, sponges, baleen whales, and many fish. Some birds, such as flamingos and certain species of duck, are also filter feeders. Filter feeders can play an important role in clarifying water, and are therefore considered ecosystem engineers. They are also important in bioaccumulation and, as a result, as indicator organisms.

Siphon (mollusc)

Siphon (mollusc)

A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda.

Euryhaline

Euryhaline

Euryhaline organisms are able to adapt to a wide range of salinities. An example of a euryhaline fish is the molly which can live in fresh water, brackish water, or salt water.

Crab

Crab

Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen), usually hidden entirely under the thorax. They live in all the world's oceans, in freshwater, and on land, are generally covered with a thick exoskeleton, and have a single pair of pincers. They first appeared during the Jurassic Period.

Flounder

Flounder

Flounders are a group of flatfish species. They are demersal fish, found at the bottom of oceans around the world; some species will also enter estuaries.

Oystercatcher

Oystercatcher

The oystercatchers are a group of waders forming the family Haematopodidae, which has a single genus, Haematopus. They are found on coasts worldwide apart from the polar regions and some tropical regions of Africa and South East Asia. The exceptions to this are the Eurasian oystercatcher, the South Island oystercatcher, and the Magellanic oystercatcher, which also breed inland, far inland in some cases. In the past there has been a great deal of confusion as to the species limits, with discrete populations of all black oystercatchers being afforded specific status but pied oystercatchers being considered one single species.

Carcinus maenas

Carcinus maenas

Carcinus maenas is a common littoral crab. It is known by different names around the world. In the British Isles, it is generally referred to as the shore crab, or green shore crab. In North America and South Africa, it bears the name european green crab.

Cercozoa

Cercozoa

Cercozoa is a phylum of diverse single-celled eukaryotes. They lack shared morphological characteristics at the microscopic level, and are instead defined by molecular phylogenies of rRNA and actin or polyubiquitin. They were the first major eukaryotic group to be recognized mainly through molecular phylogenies. They are the natural predators of many species of bacteria. They are closely related to the phylum Retaria, comprising amoeboids that usually have complex shells, and together form a supergroup called Rhizaria.

Marteilia

Marteilia

Marteilia is a protozoan genus of organisms that are parasites of bivalves. It causes QX disease in Sydney rock oysters and Aber disease in European flat oysters. After being infected by Marteilia, bivalves lose pigmentation in their visceral tissue and become emaciated.

Galicia (Spain)

Galicia (Spain)

Galicia is an autonomous community of Spain and historic nationality under Spanish law. Located in the northwest Iberian Peninsula, it includes the provinces of A Coruña, Lugo, Ourense, and Pontevedra.

Nematopsis

Nematopsis

Nematopsis (Nee-mah-top-cis) is a genus gregarine Apicomplexan of the family Porosporidae. It is an aquatic parasite of crustaceans with a molluscan intermediate host. Nematopsis has been distinguished from the similar genus Porospora by its resistant and encapsulated oocyst. Little molecular biology has been performed on the members of the Nemaptosis and species are described based on molluscan and crustacean hosts as well as oocyst structure. A total of 38 species have been described and are found all over the world.

Uses

Cockle shell ridges imprinted in fragment of Neolithic Cardial ware
Cockle shell ridges imprinted in fragment of Neolithic Cardial ware

These animals were probably a significant food source in hunter-gatherer societies of prehistoric Europe, and the clay remains of shell-imprints have been found. The clay is imprinted with fine decorations, repetitions of the distinct curved ridges, undulating lines and/or edges characteristic to the cockle shell, a natural resource of coastal waters.

Cardial ware is the name of the Neolithic pottery from maritime cultures that colonized Mediterranean shores c. 6000 – 5,500 BC, this name being based upon the old binomial name of the species: Cardium edule.

In the 1800s, a song called "Molly Malone" was first published (also known as "Cockles and Mussels"), later becoming the unofficial song of Dublin, Ireland. The lyrics describe Molly Malone selling the common cockle in the streets of that city.[6]

As food

Cockle bed with cockles (Cerastoderma edule) near De Cocksdorp on the island of Texel in the Dutch province of North Holland
Cockle bed with cockles (Cerastoderma edule) near De Cocksdorp on the island of Texel in the Dutch province of North Holland

This cockle is cooked and eaten in several countries (including the United Kingdom, France, Germany, Ireland, Japan, Portugal and Spain). It is also sometimes eaten pickled, or raw.[6]

An important species for the fishing industry, it is commercially fished in the United Kingdom, Ireland and France by suction dredge and also raking by hand. Previously the greatest catch was from the Netherlands, but now fisheries restrictions have been put in place due to environmental concerns. Similar measures have been established elsewhere, for example in Scotland where dredging with vehicles is prohibited, and in parts of England and Wales where only old-fashioned hand-gathering is permitted (using a long plank that is rocked back and forth on the sand).[12]

This species is also used in aquaculture. Farming of cockles is ongoing in the UK, the Netherlands and Portugal. However, production in those countries has not been very stable; for example, production fell from 107,800 tons in 1987 to 40,900 tons in 1997.[13] In addition to being a food source, their shells have also been used industrially as a source of lime.[5]

Gathering this species can be dangerous. In 2004, the incoming tide at Morecambe Bay in England caused 23 cockle-gatherers to die.[5]

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Prehistoric Europe

Prehistoric Europe

Prehistoric Europe is Europe with human presence but before the start of recorded history, beginning in the Lower Paleolithic. As history progresses, considerable regional irregularities of cultural development emerge and increase. The region of the eastern Mediterranean is, due to its geographic proximity, greatly influenced and inspired by the classical Middle Eastern civilizations, and adopts and develops the earliest systems of communal organization and writing. The Histories of Herodotus is the oldest known European text that seeks to systematically record traditions, public affairs and notable events.

Cardium pottery

Cardium pottery

Cardium pottery or Cardial ware is a Neolithic decorative style that gets its name from the imprinting of the clay with the heart-shaped shell of the Corculum cardissa , a member of the cockle family Cardiidae. These forms of pottery are in turn used to define the Neolithic culture which produced and spread them, commonly called the "Cardial culture".

Neolithic

Neolithic

The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of settlement.

Littoral zone

Littoral zone

The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark, to coastal areas that are permanently submerged — known as the foreshore — and the terms are often used interchangeably. However, the geographical meaning of littoral zone extends well beyond the intertidal zone to include all neritic waters within the bounds of continental shelves.

Molly Malone

Molly Malone

"Molly Malone" is a song set in Dublin, Ireland, which has become its unofficial anthem.

Dublin

Dublin

Dublin is the capital and largest city of Ireland. On a bay at the mouth of the River Liffey, it is in the province of Leinster, bordered on the south by the Dublin Mountains, a part of the Wicklow Mountains range. At the 2016 census it had a population of 1,173,179, while the preliminary results of the 2022 census recorded that County Dublin as a whole had a population of 1,450,701, and that the population of the Greater Dublin Area was over 2 million, or roughly 40% of the Republic of Ireland's total population.

De Cocksdorp

De Cocksdorp

De Cocksdorp is a village town in the Dutch province of North Holland. It is a part of the municipality of Texel, and lies about 25 km north of Den Helder. It is the youngest village on the island.

Texel

Texel

Texel is a municipality and an island with a population of 13,643 in North Holland, Netherlands. It is the largest and most populated island of the West Frisian Islands in the Wadden Sea. The island is situated north of Den Helder, northeast of Noorderhaaks, and southwest of Vlieland.

North Holland

North Holland

North Holland is a province of the Netherlands in the northwestern part of the country. It is located on the North Sea, north of South Holland and Utrecht, and west of Friesland and Flevoland. In November 2019, it had a population of 2,877,909 and a total area of 4,092 km2 (1,580 sq mi), of which 1,430 km2 (550 sq mi) is water.

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.

Lime (material)

Lime (material)

Lime is a calcium-containing inorganic material composed primarily of oxides and hydroxide, usually calcium oxide and/or calcium hydroxide. It is also the name for calcium oxide which occurs as a product of coal-seam fires and in altered limestone xenoliths in volcanic ejecta. The International Mineralogical Association recognizes lime as a mineral with the chemical formula of CaO. The word lime originates with its earliest use as building mortar and has the sense of sticking or adhering.

Morecambe Bay

Morecambe Bay

Morecambe Bay is a large estuary in northwest England, just to the south of the Lake District National Park. It is the largest expanse of intertidal mudflats and sand in the United Kingdom, covering a total area of 120 sq mi (310 km2). In 1974, the second largest gas field in the UK was discovered 25 mi (40 km) west of Blackpool, with original reserves of over 7 trillion cubic feet (tcf). At its peak, 15% of Britain's gas supply came from the bay but production is now in decline. It is also one of the homes of the high brown fritillary butterfly.

Source: "Common cockle", Wikipedia, Wikimedia Foundation, (2023, March 22nd), https://en.wikipedia.org/wiki/Common_cockle.

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References
  1. ^ a b Jan Johan ter Poorten & Serge Gofas (2011). "Cerastoderma edule (Linnaeus, 1758)". World Register of Marine Species. Retrieved April 20, 2011.
  2. ^ Linnaeus, Carl (1758). Systema Naturae per Regna Tria Naturae, Secundum Classes, Ordines, Genera, Species, cum Characteribus, Differentiis, Synonymis, Locis (in Latin). Vol. I (10th revised ed.). Holmiae: (Laurentii Salvii). p. 681 – via The Internet Archive.
  3. ^ Simpson, D.P. (1979). Cassell's Latin Dictionary (5th ed.). London: Cassell Ltd. p. 207. ISBN 0-304-52257-0.
  4. ^ a b c d Boyden, C. R. (1971). "A note on the nomenclature of two European cockles". Zoological Journal of the Linnean Society. 50 (3): 307–10. doi:10.1111/j.1096-3642.1971.tb00765.x.
  5. ^ a b c Chambers, Paul. British Seashells: A Guide for Collectors and Beachcombers, p. 158 (Casemate Publishers, 2009).
  6. ^ a b c d e f Davidson, Alan. The Oxford Companion to Food, p. 201 (Oxford University Press, 2014).
  7. ^ a b c d Considine, Douglas and Considine, Glenn. Van Nostrand's Scientific Encyclopedia, p. 2086 (Springer Science & Business Media, 2013).
  8. ^ a b Dauvin, Jean-Claude. Biological heritage and food chains, p. 25 (Quae, Centre de coopération internationale en recherche agronomique pour le développement, 2006).
  9. ^ Sanchez-Salazar, M.E.; Griffiths, C.L.; Seed, R. (1987). "The effect of size and temperature on the predation of cockles Cerastoderma edule (L.) by the shore crab Carcinus maenas (L.)". Journal of Experimental Marine Biology and Ecology. 111 (2): 181–93. doi:10.1016/0022-0981(87)90054-2.
  10. ^ Villalba, Antonio; Iglesias, David; Ramilo, Andrea; Darriba, Susana; Parada, Jose M.; No Couto, Edgar; Abollo, Elvira; Molares, Jose; Carballal, MJ (2014). "Cockle Cerastoderma edule fishery collapse in the Ría de Arousa (Galicia, NW Spain) associated with the protistan parasite Marteilia cochillia". Diseases of Aquatic Organisms. 109 (1): 55–80. doi:10.3354/dao02723. PMID 24781796.
  11. ^ Carballal, Marıa Jesus; Iglesias, David; Santamarina, Jesús; Ferro-Soto, Beatriz; Villalba, Antonio (2001). "Parasites and Pathologic Conditions of the Cockle Cerastoderma edule Populations of the Coast of Galicia (NW Spain)" (PDF). Journal of Invertebrate Pathology. 78 (2): 87–97. doi:10.1006/jipa.2001.5049. PMID 11812111. Archived from the original (PDF) on 2017-12-01. Retrieved 2017-11-26.
  12. ^ Aikens, Tom. Fish, p. 547 (Random House, 2012).
  13. ^ Spencer, Brian. Molluscan Shellfish Farming, p. 103 (John Wiley & Sons, 2008).
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