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Shrimp are crustaceans (a form of
shellfish Shellfish is a colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater envir ...
) with elongated bodies and a primarily swimming mode of locomotion – most commonly Caridea and
Dendrobranchiata Dendrobranchiata is a suborder of Decapoda, decapods, commonly known as prawns. There are 540 extant species in seven families, and a fossil record extending back to the Devonian. They differ from related animals, such as Caridea and Stenopodidea ...
of the decapod order, although some crustaceans outside of this order are referred to as "shrimp". More narrow definitions may be restricted to Caridea, to smaller species of either group or to only the marine species. Under a broader definition, ''shrimp'' may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long, narrow muscular tails ( abdomens), long whiskers ( antennae), and slender legs. Any small crustacean which resembles a shrimp tends to be called one. They swim forward by paddling with swimmerets on the underside of their abdomens, although their escape response is typically repeated flicks with the tail driving them backwards very quickly.
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 the ...
s and
lobster Lobsters are a family (biology), family (Nephropidae, Synonym (taxonomy), 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 ...
s have strong walking legs, whereas shrimp have thin, fragile legs which they use primarily for perching.Rudloe & Rudloe (2009), pp. 15–26. Shrimp are widespread and abundant. There are thousands of species adapted to a wide range of habitats. They can be found feeding near the seafloor on most coasts and estuaries, as well as in rivers and lakes. To escape predators, some species flip off the seafloor and dive into the sediment. They usually live from one to seven years. Shrimp are often solitary, though they can form large schools during the spawning season. They play important roles in the food chain and are an important food source for larger animals ranging from fish to whales. The muscular tails of many shrimp are edible to humans, and they are widely caught and farmed for human consumption. Commercial shrimp species support an industry worth 50 billion dollars a year, and in 2010 the total commercial production of shrimp was nearly 7 million tonnes. Shrimp farming became more prevalent during the 1980s, particularly in China, and by 2007 the harvest from shrimp farms exceeded the capture of wild shrimp. There are significant issues with excessive
bycatch Bycatch (or by-catch), in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juve ...
when shrimp are captured in the wild, and with pollution damage done to estuaries when they are used to support shrimp farming. Many shrimp species are small as the term ''shrimp'' suggests, about long, but some shrimp exceed . Larger shrimp are more likely to be targeted commercially and are often referred to as ''prawns'', particularly in the Commonwealth of Nations and former British colonies.


Classification

Shrimp are swimming crustaceans with long narrow muscular abdomens and long antennae. Unlike crabs and lobsters, shrimp have well developed
pleopod The decapod ( crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (abdomen). Each segment may possess one pair of appendages, although in various ...
s (swimmerets) and slender walking legs; they are more adapted for swimming than walking. Historically, it was the distinction between walking and swimming that formed the primary taxonomic division into the former suborders Natantia and Reptantia. Members of the Natantia (shrimp in the broader sense) were adapted for swimming while the Reptantia (crabs, lobsters, etc.) were adapted for crawling or walking.Bauer, 2004, Chapter 1, pp. 3–14. Some other groups also have common names that include the word "shrimp";Bauer, 2004, Chapter 2, pp. 15–35. any small swimming crustacean resembling a shrimp tends to be called one.


Description

The following description refers mainly to the external anatomy of the common European shrimp, '' Crangon crangon'', as a typical example of a decapod shrimp. The body of the shrimp is divided into two main parts: the head and thorax which are fused together to form the
cephalothorax The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind. (The terms ''prosoma'' and ''opisthosoma'' are equivalent to ''cepha ...
, and a long narrow abdomen. The shell which protects the cephalothorax is harder and thicker than the shell elsewhere on the shrimp and is called the
carapace A carapace is a Dorsum (biology), dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises. In turtles and tor ...
. The carapace typically surrounds the gills, through which water is pumped by the action of the mouthparts. The rostrum, eyes, whiskers and legs also issue from the carapace. The rostrum, from the Latin ''rōstrum'' meaning ''beak'', looks like a beak or pointed nose at the front of the shrimp's head. It is a rigid forward extension of the carapace and can be used for attack or defense. It may also stabilize the shrimp when it swims backward. Two bulbous eyes on stalks sit either side of the rostrum. These are compound eyes which have panoramic vision and are very good at detecting movement. Two pairs of whiskers ( antennae) also issue from the head. One of these pairs is very long and can be twice the length of the shrimp, while the other pair is quite short. The antennae have sensors on them which allow the shrimp to feel where they touch, and also allow them to "smell" or "taste" things by sampling the chemicals in the water. The long antennae help the shrimp orient itself with regard to its immediate surroundings, while the short antennae help assess the suitability of prey. Eight pairs of appendages issue from the cephalothorax. The first three pairs, the
maxilliped An appendage (or outgrowth) is an external body part, or natural prolongation, that protrudes from an organism's body. In arthropods, an appendage refers to any of the homologous body parts that may extend from a body segment, including anten ...
s, Latin for "jaw feet", are used as
mouthparts Mouthparts may refer to: * The parts of a mouth ** Arthropod mouthparts *** Insect mouthparts {{disambig ...
. In ''Crangon crangon'', the first pair, the maxillula, pumps water into the gill cavity. After the maxilliped come five more pairs of appendages, the
pereiopod The decapod (crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (abdomen). Each segment may possess one pair of appendages, although in various g ...
s. These form the ten decapod legs. In ''Crangon crangon'', the first two pairs of pereiopods have claws or chela. The chela can grasp food items and bring them to the mouth. They can also be used for fighting and grooming. The remaining four legs are long and slender, and are used for walking or perching.Decapod
''Encyclopædia Britannica''. Retrieved 20 August 2012.
The muscular abdomen has six segments and has a thinner shell than the carapace. Each segment has a separate overlapping shell, which can be transparent. The first five segments each have a pair of appendages on the underside, which are shaped like paddles and are used for swimming forward. The appendages are called
pleopod The decapod ( crustaceans such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon (abdomen). Each segment may possess one pair of appendages, although in various ...
s or swimmerets, and can be used for purposes other than swimming. Some shrimp species use them for brooding eggs, others have gills on them for breathing, and the males in some species use the first pair or two for insemination. The sixth segment terminates in the telson flanked by two pairs of appendages called the
uropod Uropods are posterior appendages found on a wide variety of crustaceans. They typically have functions in locomotion. Definition Uropods are often defined as the appendages of the last body segment of a crustacean. An alternative definition sugge ...
s. The uropods allow the shrimp to swim backward, and function like rudders, steering the shrimp when it swims forward. Together, the telson and uropods form a splayed tail fan. If a shrimp is alarmed, it can flex its tail fan in a rapid movement. This results in a backward dart called the caridoid escape reaction (lobstering).


Habitat

Shrimp are widespread, and can be found near the seafloor of most coasts and estuaries, as well as in rivers and lakes. There are numerous species, and usually there is a species adapted to any particular habitat. Most shrimp species are marine, although about a quarter of the described species are found in
fresh water 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 include ...
. Marine species are found at depths of up to , and from the tropics to the polar regions. Although shrimp are almost entirely fully aquatic, the two species of '' Merguia'' are semi-terrestrial and spend a significant part of their life on land in mangrove.


Behaviour

There are many variations in the ways different types of shrimp look and behave. Even within the core group of
caridean shrimp The Caridea, commonly known as caridean shrimp or true shrimp, are an infraorder of shrimp within the order Decapoda. This infraorder contains all species of true shrimp. They are found widely around the world in both fresh and salt water. Many ...
, the small delicate
Pederson's shrimp ''Ancylomenes pedersoni'', sometimes known as Pederson's shrimp and Pederson's cleaner shrimp, is a species of cleaner shrimp. It is part of the genus ''Ancylomenes'' and was described in 1958 by Fenner A. Chace Jr. as ''Periclimenes pedersoni'' ...
(above) looks and behaves quite unlike the large commercial pink shrimp or the snapping
pistol shrimp Alpheidae is a family of caridean snapping shrimp, characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound. Other common names for animals in the group are pistol shrimp or alpheid s ...
. The caridean family of
pistol shrimp Alpheidae is a family of caridean snapping shrimp, characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound. Other common names for animals in the group are pistol shrimp or alpheid s ...
are characterized by big asymmetrical claws, the larger of which can produce a loud snapping sound. The family is diverse and worldwide in distribution, consisting of about 600 species. Colonies of snapping shrimp are a major source of noise in the ocean and can interfere with sonar and underwater communication. The small emperor shrimp has a
symbiotic Symbiosis (from Greek , , "living together", from , , "together", and , bíōsis, "living") is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasit ...
relationship with sea slugs and
sea cucumber Sea cucumbers are echinoderms from the class Holothuroidea (). They are marine animals with a leathery skin and an elongated body containing a single, branched gonad. Sea cucumbers are found on the sea floor worldwide. The number of holothuria ...
s, and may help keep them clear of ectoparasites. Most shrimp are omnivorous, but some are specialised for particular modes of feeding. Some are filter feeders, using their setose (bristly) legs as a sieve; some scrape
algae Algae (; singular alga ) is an informal term for a large and diverse group of photosynthetic eukaryotic organisms. It is a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular mic ...
from rocks. Cleaner shrimp feed on the parasites and necrotic tissue of the reef fish they groom. Some species of shrimp are known to cannibalize others as well if other food sources are not readily available. In turn, shrimp are eaten by various animals, particularly fish and seabirds, and frequently host bopyrid parasites.


Mating

Females of the freshwater shrimp ''Caridina ensifera'' are capable of storing sperm from multiple partners, and thus can produce progeny with different paternities. Reproductive success of sires was found to correlate inversely with their genetic relatedness to the mother. This finding suggests that sperm competition and/or pre- and post-copulatory female choice occurs. Female choice may increase the fitness of progeny by reducing inbreeding depression that ordinarily results from the expression of homozygous deleterious recessive mutations.


Species


Decapods

There is little agreement among taxonomists concerning the phylogeny of crustaceans.Decapoda: Reptantia
'' Palaeos''. Retrieved 7 September 2012.
Within the decapods "every study gives totally different results. Nor do even one of these studies match any of the rival morphology studies".Decapoda: Caridea
'' Palaeos''. Retrieved 20 August 2012.
Some taxonomists identify shrimp with the infraorder Caridea and prawns with the suborder
Dendrobranchiata Dendrobranchiata is a suborder of Decapoda, decapods, commonly known as prawns. There are 540 extant species in seven families, and a fossil record extending back to the Devonian. They differ from related animals, such as Caridea and Stenopodidea ...
. While different experts give different answers, there is no disagreement that the caridean species are shrimp. There are over 3000 caridean species. Occasionally they are referred to as "true shrimp". Traditionally decapods were divided into two suborders: the Natantia (or swimmers), and the Reptantia (or walkers). The Natantia or swimmers included the shrimp. They were defined by their abdomen which, together with its appendages was well adapted for swimming. The Reptantia or walkers included the crabs and lobsters. These species have small abdominal appendages, but robust legs well adapted for walking. The Natantia was thought to be
paraphyletic In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...
, that is, it was thought that originally all decapods were like shrimp.Decapoda
'' Palaeos''. Retrieved 20 August 2012.
However, classifications are now based on
clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...
s, and the paraphyletic suborder Natantia has been discontinued. "On this basis, taxonomic classifications now divide the order Decapoda into the two suborders: Dendrobranchiata for the largest shrimp clade, and Pleocyemata for all other decapods. The Pleocyemata are in turn divided into half a dozen infra-orders" * The taxonomists De Grave and Fransen, 2011, recognise four major groups of shrimp: the suborder
Dendrobranchiata Dendrobranchiata is a suborder of Decapoda, decapods, commonly known as prawns. There are 540 extant species in seven families, and a fossil record extending back to the Devonian. They differ from related animals, such as Caridea and Stenopodidea ...
and the infraorders
Procarididea Procarididea is an infraorder of decapods, comprising only eleven species. Six of these are in the genera ''Procaris'' and '' Vetericaris'', which together make up the family Procarididae. The remaining five species are only known from fossils an ...
, Stenopodidea and Caridea". This group is identical to the traditional Natantia group, and contains decapods only. * All shrimp of commercial interest belong to the Natantia. The FAO determine the categories and terminology used in the reporting of global fisheries. They define a shrimp as a "decapod crustacean of the suborder Natantia". * According to the Codex Alimentarius Commission of the FAO and WHO: "The term ''shrimp'' (which includes the frequently used term ''prawn'') refers to the species covered by the most recent edition of the FAO listing of shrimp, FAO Species Catalogue, Volume 1
''Shrimps and prawns of the world, an annotated catalogue of species of interest to fisheries''
FAO Fisheries Synopsis No. 125." In turn, the ''Species Catalogue'' says the highest category it deals with is "the suborder Natantia of the order Crustacea Decapoda to which all shrimps and prawns belong". Other decapod crustaceans also called shrimp, are the ghost or mud shrimp belonging to the infra-order Thalassinidea. In Australia they are called ''yabbies''. The monophyly of the group is not certain; recent studies have suggested dividing the group into two infraorders, Gebiidea and Axiidea.


Non-decapods

A wide variety of non-decapod crustaceans are also commonly referred to as shrimp. This includes the brine shrimp, clam shrimp, fairy shrimp and
tadpole shrimp The order Notostraca, containing the single family Triopsidae, is a group of crustaceans known as tadpole shrimp or shield shrimp. The two genera, '' Triops'' and ''Lepidurus'', are considered living fossils, with similar forms having existed sinc ...
belonging to the
branchiopods Branchiopoda is a class (biology), class of crustaceans. It comprises Anostraca, fairy shrimp, clam shrimp, Diplostraca (or Cladocera), Notostraca and the Devonian ''Lepidocaris''. They are mostly small, freshwater animals that feed on plankton ...
, the lophogastridan shrimp,
opossum shrimp Mysida is an order of small, shrimp-like crustaceans in the malacostracan superorder Peracarida. Their common name opossum shrimps stems from the presence of a brood pouch or "marsupium" in females. The fact that the larvae are reared in this ...
and
skeleton shrimp Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometim ...
belonging the Malacostraca; and
seed shrimp Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typical ...
which are ostracods. Many of these species look quite unlike the commercial decapod shrimp that are eaten as seafood. For example,
skeleton shrimp Caprellidae is a family of amphipods commonly known as skeleton shrimps. Their common name denotes the threadlike slender body which allows them to virtually disappear among the fine filaments of seaweed, hydroids and bryozoans. They are sometim ...
have short legs and a slender tail like a scorpion tail, fairy shrimp swim upside down with swimming appendages that look like leaves, and the tiny
seed shrimp Ostracods, or ostracodes, are a class of the Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 70,000 species (only 13,000 of which are extant) have been identified, grouped into several orders. They are small crustaceans, typical ...
have bivalved carapaces which they can open or close. Krill resemble miniature shrimp, and are sometimes called "krill shrimp". Some
mantis shrimp Mantis shrimp, or stomatopods, are carnivorous marine crustaceans of the order Stomatopoda (). Stomatopods branched off from other members of the class Malacostraca around 340 million years ago. Mantis shrimp typically grow to around in lengt ...
are a foot long, and have bulging eyes, a flattened tail and formidable claws equipped with clubs or sharp spikes, which it can use to knock out its opponents.


Human uses


History

In 1991, archeologists suggested that ancient raised paved areas near the coast in
Chiapas Chiapas (; Tzotzil language, Tzotzil and Tzeltal language, Tzeltal: ''Chyapas'' ), officially the Free and Sovereign State of Chiapas ( es, Estado Libre y Soberano de Chiapas), is one of the states that make up the Political divisions of Mexico, ...
, Mexico, were platforms used for drying shrimp in the sun, and that adjacent clay hearths were used to dry the shrimp when there was no sun. The evidence was circumstantial, because the
chitin Chitin ( C8 H13 O5 N)n ( ) is a long-chain polymer of ''N''-acetylglucosamine, an amide derivative of glucose. Chitin is probably the second most abundant polysaccharide in nature (behind only cellulose); an estimated 1 billion tons of chit ...
ous shells of shrimp are so thin they degrade rapidly, leaving no fossil remains. In 1985 Quitmyer and others found direct evidence dating back to 600 AD for shrimping off the southeastern coast of North America, by successfully identifying shrimp from the archaeological remains of their mandibles (jaws). Clay vessels with shrimp decorations have been found in the ruins of
Pompeii Pompeii (, ) was an ancient city located in what is now the ''comune'' of Pompei near Naples in the Campania region of Italy. Pompeii, along with Herculaneum and many villas in the surrounding area (e.g. at Boscoreale, Stabiae), was buried ...
. In the 3rd century AD, the Greek author Athenaeus wrote in his literary work, ''
Deipnosophistae The ''Deipnosophistae'' is an early 3rd-century AD Greek work ( grc, Δειπνοσοφισταί, ''Deipnosophistaí'', lit. "The Dinner Sophists/Philosophers/Experts") by the Greek author Athenaeus of Naucratis. It is a long work of liter ...
''; "... of all fish the daintiest is a young shrimp in fig leaves." In North America, indigenous peoples of the Americas captured shrimp and other crustaceans in fishing weirs and
traps TNF receptor associated periodic syndrome (TRAPSsubscription needed) is a periodic fever syndrome associated with mutations in a receptor (biochemistry), receptor for the molecule tumor necrosis factors, tumor necrosis factor (TNF) that is inheri ...
made from branches and Spanish moss, or used nets woven with fibre beaten from plants. At the same time early European settlers, oblivious to the "protein-rich coasts" all about them, starved from lack of protein. In 1735
beach seine Seine fishing (or seine-haul fishing; ) is a method of fishing that employs a surrounding net, called a seine, that hangs vertically in the water with its bottom edge held down by weights and its top edge buoyed by floats. Seine nets can be dep ...
s were imported from France, and Cajun fishermen in Louisiana started catching white shrimp and drying them in the sun, as they still do today. In the mid nineteenth century, Chinese immigrants arrived for the
California Gold Rush The California Gold Rush (1848–1855) was a gold rush that began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought approximately 300,000 people to California fro ...
, many from the
Pearl River Delta The Pearl River Delta Metropolitan Region (PRD; ; pt, Delta do Rio das Pérolas (DRP)) is the low-lying area surrounding the Pearl River estuary, where the Pearl River flows into the South China Sea. Referred to as the Guangdong-Hong Kong-Mac ...
where netting small shrimp had been a tradition for centuries. Some immigrants starting catching shrimp local to
San Francisco Bay San Francisco Bay is a large tidal estuary in the U.S. state of California, and gives its name to the San Francisco Bay Area. It is dominated by the big cities of San Francisco, San Jose, and Oakland. San Francisco Bay drains water from a ...
, particularly the small inch long ''
Crangon franciscorum ''Crangon franciscorum'' is a species of shrimp in the family Crangonidae which is endemic to the brackish estuaries of California, and found from Puget Sound in the north to San Diego, California in the south. The species is especially abundant ...
''. These shrimp burrow into the sand to hide, and can be present in high numbers without appearing to be so. The catch was dried in the sun and was exported to China or sold to the Chinese community in the United States. This was the beginning of the American shrimping industry.
Overfishing Overfishing is the removal of a species of fish (i.e. fishing) from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stock), resulting in th ...
and pollution from gold mine tailings resulted in the decline of the fishery. It was replaced by a penaeid white shrimp fishery on the South Atlantic and Gulf coasts. These shrimp were so abundant that beaches were piled with windrows from their moults. Modern industrial shrimping methods originated in this area.Rudloe and Rudloe, 2009, pp.27–47. ""For shrimp to develop into one of the world's most popular foods, it took the simultaneous development of the
otter trawl Bottom trawling is trawling (towing a trawl, which is a fishing net) along the seafloor. It is also referred to as "dragging". The scientific community divides bottom trawling into benthic trawling and demersal trawling. Benthic trawling is towin ...
... and the internal combustion engine." Shrimp trawling can capture shrimp in huge volumes by dragging a net along the seafloor. Trawling was first recorded in England in 1376, when King
Edward III Edward III (13 November 1312 – 21 June 1377), also known as Edward of Windsor before his accession, was King of England and Lord of Ireland from January 1327 until his death in 1377. He is noted for his military success and for restoring r ...
received a request that he ban this new and destructive way of fishing. In 1583, the Dutch banned shrimp trawling in estuaries. In the 1920s, diesel engines were adapted for use in shrimp boats.
Power winch A winch is a mechanical device that is used to pull in (wind up) or let out (wind out) or otherwise adjust the tension of a rope or wire rope (also called "cable" or "wire cable"). In its simplest form, it consists of a spool (or drum) attache ...
es were connected to the engines, and only small crews were needed to rapidly lift heavy nets on board and empty them. Shrimp boats became larger, faster, and more capable. New fishing grounds could be explored, trawls could be deployed in deeper offshore waters, and shrimp could be tracked and caught round the year, instead of seasonally as in earlier times. Larger boats trawled offshore and smaller boats worked bays and estuaries. By the 1960s, steel and fibreglass hulls further strengthened shrimp boats, so they could trawl heavier nets, and steady advances in electronics, radar, sonar, and GPS resulted in more sophisticated and capable shrimp fleets. As shrimp fishing methods industrialised, parallel changes were happening in the way shrimp were processed. "In the 19th century, sun dried shrimp were largely replaced by
canneries Canning is a method of food preservation in which food is processed and sealed in an airtight container (jars like Mason jars, and steel and tin cans). Canning provides a shelf life that typically ranges from one to five years, although un ...
. In the 20th century, the canneries were replaced with freezers." In the 1970s, significant shrimp farming was initiated, particularly in China. The farming accelerated during the 1980s as the quantity of shrimp demand exceeded the quantity supplied, and as excessive
bycatch Bycatch (or by-catch), in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juve ...
and threats to
endangered sea turtles Worldwide, hundreds of thousands of sea turtles a year are accidentally caught in shrimp trawl nets, on longline hooks and in fishing gill-nets. Sea turtles need to reach the surface to breathe, and therefore many drown once caught. Loggerhead an ...
became associated with trawling for wild shrimp. In 2007, the production of farmed shrimp exceeded the capture of wild shrimp.


Commercial species

Although there are thousands of species of shrimp worldwide, only about 20 of these species are commercially significant. The following table contains the principal commercial shrimp, the seven most harvested species. All of them are decapods; most of them belong to the
Dendrobranchiata Dendrobranchiata is a suborder of Decapoda, decapods, commonly known as prawns. There are 540 extant species in seven families, and a fossil record extending back to the Devonian. They differ from related animals, such as Caridea and Stenopodidea ...
and four of them are penaeid shrimp.


Fishing

Commercial techniques for catching wild shrimp include otter trawls, seines and shrimp baiting. A system of nets is used when trawling. Baited
traps TNF receptor associated periodic syndrome (TRAPSsubscription needed) is a periodic fever syndrome associated with mutations in a receptor (biochemistry), receptor for the molecule tumor necrosis factors, tumor necrosis factor (TNF) that is inheri ...
are common in parts of the Pacific Northwest. Shrimp trawling can result in very high incidental catch rates of non-target species. In 1997, the FAO found discard rates up to 20 pounds for every pound of shrimp. The world average was 5.7 pounds for every pound of shrimp. Trawl nets in general, and shrimp trawls in particular, have been identified as sources of mortality for species of
finfish 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 liv ...
and
cetaceans Cetacea (; , ) is an infraorder of aquatic mammals that includes whales, dolphins, and porpoises. Key characteristics are their fully aquatic lifestyle, streamlined body shape, often large size and exclusively carnivorous diet. They propel them ...
. Bycatch is often discarded dead or dying by the time it is returned to the sea, and may alter the ecological balance in discarded regions. Worldwide, shrimp trawl fisheries generate about 2% of the world's catch of fish in weight, but result in more than one third of the global bycatch total. The most extensively fished species are the akiami paste shrimp, the
northern prawn ''Pandalus borealis'' is a species of caridean shrimp found in cold parts of the northern Atlantic and northern Pacific Oceans, although the latter population now often is regarded as a separate species, ''P. eous''. The Food and Agriculture Orga ...
, the
southern rough shrimp ''Trachysalambria curvirostris'' (formerly ''Trachypenaeus curvirostris'') is a species of prawn that lives in shallow waters of the Indo-West Pacific. It is one of the most important species targeted by prawn fishery, with annual harvests of mor ...
, and the
giant tiger prawn ''Penaeus monodon'', commonly known as the giant tiger prawn, Asian tiger shrimp, black tiger shrimp, and other names, is a marine crustacean that is widely reared for food. Taxonomy ''Penaeus monodon'' was first described by Johan Christian ...
. Together these four species account for nearly half of the total wild capture. In recent years, the global capture of wild shrimp has been overtaken by the harvest from farmed shrimp.


Farming

A shrimp farm is an
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 ...
business for the cultivation of marine shrimp or prawns for human consumption. Commercial shrimp farming began in the 1970s, and production grew steeply, particularly to match the market demands of the United States,
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
and Western Europe. The total global production of farmed shrimp reached more than 1.6 million tonnes in 2003, representing a value of nearly 9 billion
U.S. dollars The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official ...
. About 75% of farmed shrimp are produced in Asia, in particular in
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
, Thailand, Indonesia, India and Vietnam. The other 25% are produced mainly in Latin America, where Brazil is the largest producer. By 2016, the largest exporting nation is India, followed by Ecuador, Thailand, Indonesia and China. As can be seen from the global production chart on the left, significant aquaculture production started slowly in the 1970s and then rapidly expanded during the 1980s. After a lull in growth during the 1990s, due to pathogens, production took off again and by 2007 exceeded the capture from wild fisheries. By 2010, the aquaculture harvest was 3.9 million tonnes, compared to 3.1 million tonnes for the capture of wild shrimp. In the earlier years of marine shrimp farming the preferred species was the large
giant tiger prawn ''Penaeus monodon'', commonly known as the giant tiger prawn, Asian tiger shrimp, black tiger shrimp, and other names, is a marine crustacean that is widely reared for food. Taxonomy ''Penaeus monodon'' was first described by Johan Christian ...
. This species is reared in circular holding tanks where they think they are in the open ocean, and swim in "never ending migration" around the circumference of the tank. In 2000, global production was 630,984 tonnes, compared to only 146,362 tonnes for whiteleg shrimp. Subsequently, these positions reversed, and by 2010 the production of giant tiger prawn increased modestly to 781,581 tonnes while whiteleg shrimp rocketed nearly twenty-fold to 2,720,929 tonnes. The whiteleg shrimp is currently the dominant species in shrimp farming. It is a moderately large shrimp reaching a total length of 230 mm (9"), and is particularly suited to farming because it "breeds well in captivity, can be stocked at small sizes, grows fast and at uniform rates, has comparatively low protein requirements... and adapts well to variable environmental conditions." In China, prawns are cultured along with sea cucumbers and some fish species, in integrated multi-trophic systems. The major producer of farmed shrimp is China. Other significant producers are Thailand, Indonesia, India, Vietnam, Brazil, Ecuador and Bangladesh. Most farmed shrimp is exported to the United States, the European Union and Japan, also other Asian markets, including South Korea, Hong Kong, Taiwan and Singapore. Investigations by '' The Guardian'' in 2014 and '' The Associated Press'' in 2015 found human rights abuses on fishing boats operated by Thailand. The boats are manned with
slaves Slavery and enslavement are both the state and the condition of being a slave—someone forbidden to quit one's service for an enslaver, and who is treated by the enslaver as property. Slavery typically involves slaves being made to perf ...
, and catch shrimp and fish (including fish for the production of fishmeal which is fed to farmed prawns).
Greenpeace Greenpeace is an independent global campaigning network, founded in Canada in 1971 by Irving Stowe and Dorothy Stowe, immigrant environmental activists from the United States. Greenpeace states its goal is to "ensure the ability of the Earth t ...
has challenged the sustainability of tropical shrimp farming practices on the grounds that farming these species "has led to the destruction of vast areas of mangroves in several countries ndover-fishing of juvenile shrimp from the wild to supply farms." Greenpeace has placed a number of the prominent tropical shrimp species that are farmed commercially on its seafood red list, including the whiteleg shrimp,
Indian prawn The Indian prawn (''Fenneropenaeus indicus'', formerly ''Penaeus indicus''), is one of the major commercial prawn species of the world. It is found in the Indo-West Pacific from eastern and south-eastern Africa, through India, Malaysia and Indone ...
and
giant tiger shrimp ''Penaeus monodon'', commonly known as the giant tiger prawn, Asian tiger shrimp, black tiger shrimp, and other names, is a marine crustacean that is widely reared for food. Taxonomy ''Penaeus monodon'' was first described by Johan Christian ...
.Seafood Red list
''Greenpeace''. Retrieved 6 August 2012.


As food

Shrimp are
marketed Marketing is the process of exploring, creating, and delivering value to meet the needs of a target market in terms of goods and services; potentially including selection of a target audience; selection of certain attributes or themes to empha ...
and commercialized with several issues in mind. Most shrimp are sold frozen and marketed based on their categorization of presentation, grading, colour, and uniformity. Shrimp have high levels of omega-3 fatty acids and low levels of
mercury Mercury commonly refers to: * Mercury (planet), the nearest planet to the Sun * Mercury (element), a metallic chemical element with the symbol Hg * Mercury (mythology), a Roman god Mercury or The Mercury may also refer to: Companies * Merc ...
. Usually shrimp is sold whole, though sometimes only the meat of shrimp is marketed. As with other seafood, shrimp is high in calcium,
iodine Iodine is a chemical element with the symbol I and atomic number 53. The heaviest of the stable halogens, it exists as a semi-lustrous, non-metallic solid at standard conditions that melts to form a deep violet liquid at , and boils to a vi ...
and protein but low in food energy. A shrimp-based meal is also a significant source of cholesterol, from 122  mg to 251 mg per 100  g of shrimp, depending on the method of preparation. Shrimp consumption, however, is considered healthy for the circulatory system because the lack of significant levels of saturated fat in shrimp means that the high cholesterol content in shrimp actually improves the ratio of LDL to HDL cholesterol and lowers triglycerides. ''Ebiko'' - shrimp roe, sometimes translated as "shrimp flakes" - is used as one of the ingredients in the preparation of sushi. Shrimp and other
shellfish Shellfish is a colloquial and fisheries term for exoskeleton-bearing aquatic invertebrates used as food, including various species of molluscs, crustaceans, and echinoderms. Although most kinds of shellfish are harvested from saltwater envir ...
are among the most common
food allergens A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, swelling of the tongue, vomiting, diarrhea, hives, trouble breathing, or low blood pressur ...
. They are not
kosher (also or , ) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher ( in English, yi, כּשר), fro ...
and thus are forbidden in Jewish cuisine.


Aquaria

Several types of shrimp are kept in home aquaria. Some are purely ornamental, while others are useful in controlling algae and removing debris. Freshwater shrimp commonly available for aquaria include the
Bamboo shrimp ''Atyopsis'' is a genus of fresh water, freshwater shrimp from Southeast Asia. It was erected in 1983 by Fenner A. Chace, Jr. for two species formerly treated in the genus ''Atya''. It differs from ''Atya'' by various characters, including the fo ...
, Japanese marsh shrimp (''Caridina multidentata,'' also called "Amano shrimp," as their use in aquaria was pioneered by
Takashi Amano was a professional track cyclist, photographer, designer, and aquarist. His interest in aquaria led him to create the Japanese company Aqua Design Amano. Amano was the author of ''Nature Aquarium World'' (TFH Publications, 1994), a three-boo ...
),
cherry shrimp ''Neocaridina davidi'' is a freshwater shrimp originating from eastern China and northern Taiwan and introduced in the rest of Taiwan, Japan, and Hawaii, which is commonly kept in aquaria. The natural coloration of the shrimp is green-brow ...
(''Neocaridina heteropoda''), and ghost or glass shrimp (''
Palaemonetes ''Palaemonetes'', its common names include glass shrimp, ghost shrimp, feeder shrimp, is a genus of caridean shrimp comprising a geographically diverse group of fresh water, brackish and marine crustaceans. Conventionally, ''Palaemonetes'' i ...
'' spp.). Popular saltwater shrimp include the cleaner shrimp '' Lysmata amboinensis'', the fire shrimp (''
Lysmata debelius ''Lysmata debelius'' is a species of cleaner shrimp indigenous to the Indo-Pacific. It is popular in the aquarium trade, where it is known as the fire shrimp, blood shrimp or scarlet cleaner shrimp. Taxonomy ''Lysmata debelius'' was first descr ...
'') and the harlequin shrimp (''
Hymenocera picta ''Hymenocera picta'', commonly known as the harlequin shrimp, is a species of saltwater shrimp found at coral reefs in the tropical Indian and Pacific Oceans. It is usually considered the only species in the genus ''Hymenocera'', but some split ...
'').


Shrimp versus prawn

The terms ''shrimp'' and ''prawn'' are
common name In biology, a common name of a taxon or organism (also known as a vernacular name, English name, colloquial name, country name, popular name, or farmer's name) is a name that is based on the normal language of everyday life; and is often contrast ...
s, not
scientific name In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
s. They are vernacular or colloquial terms which lack the formal definition of
scientific terms Scientific terminology is the part of the language that is used by scientists in the context of their professional activities. While studying nature, scientists often encounter or create new material or immaterial objects and concepts and are comp ...
. They are not taxa, but are terms of convenience with little circumscriptional significance. There is no reason to avoid using the terms shrimp or prawn when convenient, but it is important not to confuse them with the names or relationships of actual taxa. According to the crustacean taxonomist Tin-Yam Chan, "The terms ''shrimp'' and ''prawn'' have no definite reference to any known taxonomic groups. Although the term ''shrimp'' is sometimes applied to smaller species, while ''prawn'' is more often used for larger forms, there is no clear distinction between both terms and their usage is often confused or even reverse in different countries or regions." Writing in 1980,
L. B. Holthuis Lipke Bijdeley Holthuis (21 April 1921 – 7 March 2008) was a Dutch carcinologist, considered one of the "undisputed greats" of carcinology, and "the greatest carcinologist of our time". Holthuis was born in Probolinggo, East Java and obtained ...
noted that the terms ''prawn'' and ''shrimp'' were used inconsistently "even within a single region", generalising that larger species fished commercially were generally called ''shrimp'' in the United States, and ''prawns'' in other English-speaking countries, although not without exceptions.Holthuis, L. B. (1980) tp://ftp.fao.org/docrep/fao/009/ac477e/ac477e02.pdf ''Shrimps and prawns of the world''Volume I of the FAO species catalogue, Fisheries Synopsis No.125, Rome. . A lot of confusion surrounds the scope of the term ''shrimp''. Part of the confusion originates with the association of smallness. That creates problems with shrimp-like species that are not small. The expression "jumbo shrimp" can be viewed as an oxymoron, a problem that does not exist with the commercial designation "jumbo prawns". The term ''shrimp'' originated around the 14th century with the Middle English ', akin to the Middle Low German ', and meaning to contract or wrinkle; and the Old Norse ', meaning to shrivel up, or ''skreppa'', meaning a thin person. It is not clear where the term ''prawn'' originated, but early forms of the word surfaced in England in the early 15th century as ''prayne, praine'' and ''prane''. According to the linguist Anatoly Liberman it is unclear how ''shrimp'', in English, came to be associated with ''small''. "No Germanic language associates the shrimp with its size... The same holds for Romance... it remains unclear in what circumstances the name was applied to the crustacean." Liberman, Anatoly (2012
A scrumptious shrimp with a riddle
''Oxford University Press's Blog'', 18 April 2012.
Taxonomic studies in Europe on shrimp and prawns were shaped by the
common shrimp ''Crangon crangon'' is a species of caridean shrimp found across the northeastern Atlantic Ocean from the White Sea in the north of Russia to the coast of Morocco, including the Baltic Sea, as well as occurring throughout the Mediterranean and Bl ...
and the
common prawn Common may refer to: Places * Common, a townland in County Tyrone, Northern Ireland * Boston Common, a central public park in Boston, Massachusetts * Cambridge Common, common land area in Cambridge, Massachusetts * Clapham Common, originally com ...
, both found in huge numbers along the European coastlines. The common shrimp, ''Crangon crangon'', was categorised in 1758 by Carl Linnaeus, and the common prawn, ''Palaemon serratus'', was categorised in 1777 by Thomas Pennant. The common shrimp is a small burrowing species aligned with the notion of a shrimp as being something small, whereas the common prawn is much larger. The terms ''true shrimp'' or ''true prawn'' are sometimes used to mean what a particular person thinks is a shrimp or prawn. This varies with the person using the terms. But such terms are not normally used in the scientific literature, because the terms ''shrimp'' and ''prawn'' themselves lack scientific standing. Over the years the way ''shrimp'' and ''prawn'' are used has changed, and nowadays the terms are almost interchangeable. Although from time to time some biologists declare that certain common names should be confined to specific taxa, the popular use of these names seems to continue unchanged.


Fossils

Only 57 exclusively fossil species are known in the shrimp fossil record. The earliest dates from the Lower Jurassic, followed by specimens from the Cretaceous.


See also

* Pain in crustaceans


References


Further reading

* Bauer, Raymond T (2004
"Remarkable Shrimps: Adaptations and Natural History of the Carideans"
University of Oklahoma Press. . * * Fransen CHJM and De Grave S (2009
"Evolution and radiation of shrimp-like decapods: an overview"
In: Martin J.W., Crandall K.A., Felder D.L. (eds.), ''Decapod Crustacean Phylogenetics''. CRC Press, pp. 246–259. * Kaplan, Eugene H (2010
''Sensuous Seas: Tales of a Marine Biologist''
Princeton University Press. . * Meyer R, Lochner S and Melzer RR (2009
Decapoda – Crabs, Shrimps & Lobsters
pp. 623–670 In: Häussermann V and Förstera G (eds) ''Marine Benthic Fauna of Chilean Patagonia: Illustrated Identification Guide", Nature in Focus. . * Poore, Gary (2004
''Marine Decapod Crustacea of Southern Australia: A Guide to Identification"
Csiro Publishing. . * Fearnley-Whittingstall, H and Fisher N (2007
''The River Cottage Fish Book''
Page 541–543, Bloomsbury Publishing. . * Roberts, Callum (2009
''The unnatural history of the sea''
Island Press. . * Rudloe, Jack and Rudloe, Anne (2009
''Shrimp: The Endless Quest for Pink Gold''
FT Press. . * Ruppert EE, Fox RS and Barnes RD (2004
''Invertebrate zoology: A functional evolutionary approach''
7th edition, Thomson-Brooks/Cole. . *


External links

* tp://ftp.fao.org/docrep/fao/005/y1679e/y1679e04.pdf "Internal and External Anatomy of a Penaeid Shrimp"Fisheries Technical Paper 395, FAO, Rome.
Shrimp versus prawn

shrimp,lobster,crab
ngrams * Shrimp versus prawns
– ''YouTube'' * {{Authority control Commercial crustaceans Decapods Edible crustaceans Seafood Arthropod common names