Shellfish is a colloquial and
fisheries
Fishery can mean either the enterprise of raising or harvesting fish and other aquatic life; or more commonly, the site where such enterprise takes place ( a.k.a. fishing ground). Commercial fisheries include wild fisheries and fish farms, ...
term for
exoskeleton
An exoskeleton (from Greek ''éxō'' "outer" and ''skeletós'' "skeleton") is an external skeleton that supports and protects an animal's body, in contrast to an internal skeleton ( endoskeleton) in for example, a human. In usage, some of the ...
-bearing
aquatic invertebrate
Invertebrates are a paraphyletic group of animals that neither possess nor develop a vertebral column (commonly known as a ''backbone'' or ''spine''), derived from the notochord. This is a grouping including all animals apart from the chorda ...
s used as
food
Food is any substance consumed by an organism for nutritional support. Food is usually of plant, animal, or fungal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is in ...
, including various species of
mollusc
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is est ...
s,
crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapoda, decapods, ostracoda, seed shrimp, branchiopoda, branchiopods, argulidae, fish lice, krill, remipedes, isopoda, isopods, barnacles, copepods, ...
s, and
echinoderm
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the ...
s. Although most kinds of shellfish are harvested from
saltwater environments, some are found in
freshwater
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does incl ...
. In addition, a few species of
land crabs
A number of lineages of crabs have evolved to live predominantly on land. Examples of terrestrial crabs are found in the families Gecarcinidae and Gecarcinucidae, as well as in selected genera from other families, such as '' Sesarma'', althoug ...
are eaten, for example ''
Cardisoma guanhumi'' in the
Caribbean
The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean ...
. Shellfish are among the most common
food allergens.
Despite the name, ''shellfish'' are not
fish
Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as we ...
. Most shellfish are
low on the
food chain and eat a diet composed primarily of
phytoplankton
Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'.
...
and
zooplankton
Zooplankton are the animal component of the planktonic community ("zoo" comes from the Greek word for ''animal''). Plankton are aquatic organisms that are unable to swim effectively against currents, and consequently drift or are carried along by ...
. Many varieties of shellfish, and
crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapoda, decapods, ostracoda, seed shrimp, branchiopoda, branchiopods, argulidae, fish lice, krill, remipedes, isopoda, isopods, barnacles, copepods, ...
s in particular, are actually closely related to
insects and
arachnids
Arachnida () is a class of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegar ...
; crustaceans make up one of the main
subphyla of the phylum
Arthropoda
Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chitin ...
.
Molluscs include
cephalopods
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, a ...
(squids, octopuses, cuttlefish) and
bivalves
Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, bival ...
(clams, oysters), as well as
gastropods (aquatic species such as
whelks
Whelk (also known as scungilli) is a common name applied to various kinds of sea snail. Although a number of whelks are relatively large and are in the family Buccinidae (the true whelks), the word ''whelk'' is also applied to some other marine ...
and winkles; land species such as snails and slugs).
Molluscs used as a food source by humans include many
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriat ...
of
clams,
mussel
Mussel () is the common name used for members of several families of bivalve molluscs, from saltwater and freshwater habitats. These groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which ...
s,
oyster
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 ...
s,
winkles, and
scallop
Scallop () is a common name that encompasses various species of marine bivalve mollusks in the taxonomic family Pectinidae, the scallops. However, the common name "scallop" is also sometimes applied to species in other closely related families ...
s. Some crustaceans that are commonly eaten are
shrimp
Shrimp are crustaceans (a form of shellfish) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and Dendrobranchiata of the decapod order, although some crustaceans outside of this order are ref ...
,
lobster
Lobsters are a family (Nephropidae, synonym Homaridae) of marine crustaceans. They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, ...
s,
crayfish,
crab
Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) ( el, βραχύς , translit=brachys = short, / = tail), usually hidden entirely under the thorax. They live in all th ...
s and
barnacle
A barnacle is a type of arthropod constituting the subclass Cirripedia in the subphylum Crustacea, and is hence related to crabs and lobsters. Barnacles are exclusively marine, and tend to live in shallow and tidal waters, typically in erosiv ...
s.
Echinoderm
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the ...
s are not as frequently harvested for food as molluscs and crustaceans; however,
sea urchin roe is quite popular in many parts of the world, where the live delicacy is harder to transport.
Though some shellfish harvesting has been unsustainable, and
shrimp farming has been destructive in some parts of the world, shellfish farming can be important to environmental restoration, by developing reefs, filtering water and eating biomass.
Terminology
The term "shellfish" is used both broadly and specifically. In common parlance, as in "having shellfish for dinner", it can refer to anything from clams and oysters to lobster and shrimp. For regulatory purposes it is often narrowly defined as filter-feeding
molluscs such as clams, mussels, and oyster to the exclusion of
crustacean
Crustaceans (Crustacea, ) form a large, diverse arthropod taxon which includes such animals as decapoda, decapods, ostracoda, seed shrimp, branchiopoda, branchiopods, argulidae, fish lice, krill, remipedes, isopoda, isopods, barnacles, copepods, ...
s and all else.
Although the term is primarily applied to
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military ...
species, edible
freshwater
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does incl ...
invertebrates such as
crayfish and river
mussels are also sometimes grouped under the umbrella term "shellfish".
Although their shells may differ, all shellfish are invertebrates. As non-mammalian animals that spend their entire lives in water they are "fish" in an informal sense; however, the term ”finfish" is sometimes used to distinguish
fish
Fish are Aquatic animal, aquatic, craniate, gill-bearing animals that lack Limb (anatomy), limbs with Digit (anatomy), digits. Included in this definition are the living hagfish, lampreys, and Chondrichthyes, cartilaginous and bony fish as we ...
, animals defined by having
vertebrae
The spinal column, a defining synapomorphy shared by nearly all vertebrates, Hagfish are believed to have secondarily lost their spinal column is a moderately flexible series of vertebrae (singular vertebra), each constituting a characteristi ...
, from shellfish in modern terminology.
The word "shellfish" is both singular and plural; the rarely used "shellfishes" is sometimes employed to distinguish among various types of shellfish.
Shellfish in various cuisines
Archaeological finds have shown that humans have been making use of shellfish as a food item for hundreds of thousands of years. In the present, shellfish dishes are a feature of almost all the
cuisines of the world, providing an important source of protein in many cuisines around the world, especially in the countries with coastal areas.
In Japan
In the
Japanese cuisine
Japanese cuisine encompasses the regional and traditional foods of Japan, which have developed through centuries of political, economic, and social changes. The traditional cuisine of Japan ( Japanese: ) is based on rice with miso soup and oth ...
, chefs often use shellfish and their
roe in different dishes.
Sushi (vinegared rice, topped with other ingredients, including shellfish, fish, meat and vegetables) features both raw and cooked shellfish.
Sashimi
is a Japanese delicacy consisting of fresh raw fish or meat sliced into thin pieces and often eaten with soy sauce.
Origin
The word ''sashimi'' means "pierced body", i.e. " 刺身" = ''sashimi'', where 刺 し = ''sashi'' (pierced, stu ...
primarily consists of very fresh raw seafood, sliced into thin pieces. Both sushi and sashimi are served with soy sauce and
wasabi paste (a Japanese
horseradish root, a spice with extremely strong, hot flavor), thinly sliced pickled ginger root, and a simple garnish such as
shiso (a kitchen herb, member of the
mint
MiNT is Now TOS (MiNT) is a free software alternative operating system kernel for the Atari ST system and its successors. It is a multi-tasking alternative to TOS and MagiC. Together with the free system components fVDI device drivers, XaAE ...
family) or finely shredded daikon radish, or both.
In the United States
Lobster
Lobsters are a family (Nephropidae, synonym Homaridae) of marine crustaceans. They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, ...
in particular is a great delicacy in the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
, where families in the Northeast region make them into the centerpiece of a
clam bake, usually for special occasions. Lobsters are eaten on much of the East Coast; the
American lobster
The American lobster (''Homarus americanus'') is a species of lobster found on the Atlantic coast of North America, chiefly from Labrador to New Jersey. It is also known as Atlantic lobster, Canadian lobster, true lobster, northern lobster, Can ...
ranges from
Newfoundland
Newfoundland and Labrador (; french: Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region ...
down to about the
Carolinas
The Carolinas are the U.S. states of North Carolina and South Carolina, considered collectively. They are bordered by Virginia to the north, Tennessee to the west, and Georgia to the southwest. The Atlantic Ocean is to the east.
Combining Nor ...
, but is most often associated with
Maine
Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and nor ...
. A typical meal involves boiling the lobster with some slight seasoning and then serving it with drawn butter,
baked potato, and
corn on the cob
Corn on the cob is a culinary term for a cooked ear of sweet corn (maize) eaten directly off the cob. The ear is picked while the endosperm is in the "milk stage" so that the kernels are still tender. Ears of corn are steamed, boiled, or ...
.
Clamming is done both commercially and recreationally along the Northeast coastline of the US. Various type of clams are incorporated into the
cuisine of New England
New England cuisine is an American cuisine which originated in the New England region of the United States, and traces its roots to traditional English cuisine and Native American cuisine of the Abenaki, Narragansett, Niantic, Wabanaki, Wampan ...
. The soft-shelled clam is eaten either
fried or
steamed (and then called "
steamers"). Many types of clams can be used for
clam chowder, but the
quahog
The hard clam ('' Mercenaria mercenaria''), also known as the round clam, hard-shell (or hard-shelled) clam, or the quahog, is an edible marine bivalve mollusk that is native to the eastern shores of North America and Central America from Prince ...
, a hard shelled clam also known as a chowder clam, is often used because the long cooking time softens its tougher meat.
The
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 the parts: the Eastern Shore of Maryland / ...
and
Maryland
Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean t ...
region has generally been associated more with crabs, but in recent years the area has been trying to reduce its catch of
blue crabs Blue crab may refer to:
* Blue Crab 11, an American sailboat design
* ''Callinectes sapidus'' – Chesapeake or Atlantic blue crab of the West Atlantic, introduced elsewhere
* '' Cardisoma guanhumi'' – blue land crab of the West Atlantic
* ''Disc ...
, as wild populations have been depleted. This has not, however, stemmed the demand: Maryland-style
crabcake
A crab cake is a variety of fishcake that is popular in the United States. It is composed of crab meat and various other ingredients, such as bread crumbs, mayonnaise, mustard (typically prepared mustard, but sometimes mustard powder), eggs, and ...
s are still a well known treat in crabhouses all over the bay, though the catch now comes from points farther south.
In the
Southeast, and particularly the gulf states,
shrimping
The shrimp fishery is a major global industry, with more than 3.4 million tons caught per year, chiefly in Asia. Rates of bycatch are unusually high for shrimp fishing, with the capture of sea turtles being especially contentious.
A shrimper is ...
is an important industry. Copious amounts of shrimp are harvested each year in the
Gulf of Mexico
The Gulf of Mexico ( es, Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United ...
and the
Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . 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 ...
to satisfy a national demand for shrimp. Locally, prawns and shrimp are often deep fried; in the Cajun and Creole kitchens of
Louisiana
Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is bord ...
, shrimp and prawns are a common addition to traditional recipes like
jambalaya
Jambalaya ( , ) is an American Creole and Cajun rice dish of French (especially Provençal cuisine), African, and Spanish influence, consisting mainly of meat and vegetables mixed with rice.
Ingredients
Traditionally, the meat includes s ...
and certain stews.
Crawfish
Crayfish are freshwater crustaceans belonging to the clade Astacidea, which also contains lobsters. In some locations, they are also known as crawfish, craydids, crawdaddies, crawdads, freshwater lobsters, mountain lobsters, rock lobsters, m ...
are a well known and much eaten delicacy there, often boiled in huge pots and heavily spiced.
In many major cities with active fishing ports, raw oyster bars are also a feature of shellfish consumption. When served freshly shucked (opened) and iced, one may find a liquid inside the shell, called the liquor. Some believe that oysters have the properties of an
aphrodisiac.
Inter-tidal herbivorous shellfish such as mussels and clams can help people reach a healthy balance of
omega-3 and omega-6 fats in their diets, instead of the current
Western diets. For this reason, the eating of shellfish is often encouraged by dietitians.
Some popular dishes using shellfish:
*
Ceviche
*
Cioppino
*
Clam chowder
*
Curanto
*
Fruits de mer
*
Paella
*
Sashimi
is a Japanese delicacy consisting of fresh raw fish or meat sliced into thin pieces and often eaten with soy sauce.
Origin
The word ''sashimi'' means "pierced body", i.e. " 刺身" = ''sashimi'', where 刺 し = ''sashi'' (pierced, stu ...
and
Sushi
*
Shrimp cocktail
*
Lobster
Lobsters are a family (Nephropidae, synonym Homaridae) of marine crustaceans. They have long bodies with muscular tails and live in crevices or burrows on the sea floor. Three of their five pairs of legs have claws, including the first pair, ...
bisque
*
She-crab soup
She-crab soup is a rich soup, similar to bisque, made of milk or heavy cream, crab or fish stock, Atlantic blue crab meat, and (traditionally) crab roe, and a small amount of dry sherry added as it is plated. It may be thickened either by heat ...
Religious dietary restrictions
The
Torah
The Torah (; hbo, ''Tōrā'', "Instruction", "Teaching" or "Law") is the compilation of the first five books of the Hebrew Bible, namely the books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy. In that sense, Torah means the ...
forbids the consumption of shellfish (i.e. the only permitted seafood is fish with fins and scales), in the books of
Leviticus and
Deuteronomy
Deuteronomy ( grc, Δευτερονόμιον, Deuteronómion, second law) is the fifth and last book of the Torah (in Judaism), where it is called (Hebrew: hbo, , Dəḇārīm, hewords Moses.html"_;"title="f_Moses">f_Moseslabel=none)_and_th ...
. Jews (of all religious traditions) who fully observe the dietary laws thus do not eat shellfish. Neither do
Seventh-day Adventists, who follow Jewish dietary law.
Islamic schools of thought vary on whether (and which types of) shellfish may be acceptable.
Allergy
Approximately 1% of the population is estimated to suffer from shellfish allergy,
which is more common in teenage and adult life than very early childhood.
Toxic content
Some shellfish, such as
whelk, contain
arsenic
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, b ...
. A sample of whelk was found to have a total content of arsenic at of which 1% is inorganic arsenic.
Shellfish caught in
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U ...
can lead to
paralytic shellfish poisoning (PSP).
PSP is caused by toxins namely Saxitoxins released by
dinoflagellate
The dinoflagellates ( Greek δῖνος ''dinos'' "whirling" and Latin ''flagellum'' "whip, scourge") are a monophyletic group of single-celled eukaryotes constituting the phylum Dinoflagellata and are usually considered algae. Dinoflagellates are ...
, a type of protista(also considered algae), which are extremely poisonous (1000 times more potent than cyanide) and can lead to death by paralyzing the breathing muscles.
Due to warming oceans algae blooms have become more widespread, thereby increasing the likelihood of intoxications of various types.
Ecosystem services and reef-building
Shellfish of various kinds contribute to the formation of
reef
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic processes—deposition of sand, wave erosion planing down rock ...
s, such as when millions of oysters or mussels aggregate together. Reefs provide habitat for numerous other species, bury carbon, contributing to
climate change mitigation
Climate change mitigation is action to limit climate change by reducing emissions of greenhouse gases or removing those gases from the atmosphere. The recent rise in global average temperature is mostly caused by emissions from fossil fuels bu ...
,
and defend the shore against erosion, floods and waves. Conversely, when they are destroyed or exploited, carbon can be released into the atmosphere, simultaneously increasing the likelihood of severe weather while removing the natural defence against its consequences.
In addition, some shellfish are known for filtering water, removing suspended particles and contaminants, which contributes to both quality and clarity.
These benefits cascade to other species that are helpful to humankind such as seagrasses.
See also
*
Aquaculture
Aquaculture (less commonly spelled aquiculture), 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 (e.g. lot ...
*
Seafood
*
Seashell
A seashell or sea shell, also known simply as a shell, is a hard, protective outer layer usually created by an animal or organism that lives in the sea. The shell is part of the body of the animal. Empty seashells are often found washe ...
*
Shellfish Association of Great Britain
The Shellfish Association of Great Britain (SAGB) is a historic association that was founded as the Oyster Merchants' and Planters' Association in 1903, it was renamed the SAGB in 1969. They cover a wide range of topics within the shellfish indust ...
(SAGB)
References
Sources
*
Pawley, Andrew (2004
"Are crustaceans shellfish? A whiff of scandal in English lexicography"''Australian Style'', 12 (1): 1–3.
External links
BC Shellfish Growers AssociationEast Coast Shellfish Growers AssociationPacific Coast Shellfish Growers AssociationShellfish Galleryat the
University of Washington Libraries, Digital Collection
*
ttp://www.healthaliciousness.com/nutritionfacts/nutrition-comparison.php?o=90240&t=15169&h=15159&s=100&e=100&r=100 Nutrition Facts for Various Shellfish
{{Authority control
Seafood
Fish products