Common carp

Thecommon carp(Cyprinus carpio), also known asEuropean carporEurasian carp, is a widespreadfreshwater fishofeutrophicwaters in lakes and large rivers inEuropeandAsia.The native wild populations are consideredvulnerableto extinction by the International Union for Conservation of Nature (IUCN),but the species has also beendomesticatedandintroduced(seeaquaculture) into environments worldwide, and is often considered a destructiveinvasive species,being included in thelist of the world's 100 worst invasive species. It gives its name to thecarpfamily,Cyprinidae.
The type subspecies isCyprinus carpio carpio, native to much of Europe (notably theDanubeandVolgarivers).
The subspeciesCyprinus carpio haematopterus(Amur carp), native to eastern Asia, was recognized in the past,but recent authorities treat it as a separate species under the nameCyprinus rubrofuscus.The common carp and various Asianrelativesin their pure forms can be separated bymeristicsand also differ ingenetics, but they are able tointerbreed.Common carp can also interbreed with thegoldfish(Carassius auratus); the result is calledKollar carp.Another artificial hybrid is Ghost Carp, which is bred between common carp and Japanese Purachina Koi. The large variation of colours produced makes ghost carp a popular commercial species.
The common carp is native to Europe and Asia and has been introduced to every part of the world except the poles. They are the third most frequently introduced fish species worldwide,and their history as a farmed fish dates back to Roman times.Carp are used as food in many areas but are also regarded as a pest in several regions due to their ability to out-compete native fish stocks.The original common carp was found in the inland delta of theDanube Riverabout 2000 years ago and was torpedo-shaped and golden-yellow in colour. It had two pairs of barbels and a mesh-like scale pattern. Although this fish was initially kept as an exploited captive, it was later maintained in large, specially built ponds by the Romans in south-central Europe (verified by the discovery of common carp remains in excavated settlements in the Danube delta area). As aquaculture became a profitable branch of agriculture, efforts were made to farm the animals, and the culture systems soon included spawning and growing ponds.The common carp's native range also extends to theBlack Sea,Caspian Sea, andAral Sea.
Both European and Asian subspecies have beendomesticated.In Europe, domestication of carp asfood fishwas spread bymonksbetween the 13th and 16th centuries. The wild forms of carp had already reached the delta of theRhinein the 12th century, probably with some human help.Variants that have arisen with domestication include themirror carp, with large, mirror-like scales (linear mirror – scaleless except for a row of large scales that run along thelateral line; originating inGermany), the leather carp (virtually unscaled except near dorsal fin), and the fully scaled carp.Koicarp (錦鯉 (nishikigoi) in Japanese, 鯉魚 (pinyin:lĭ yú) in Chinese) is a domesticated ornamental variety that originated in the Niigata region ofJapanin the 1820s,but its parent species are likely the East Asian carp, possiblyC. rubrofuscus.
The carp has a robust build, with a dark gold sheen that is most prominent on its head. Its body is adorned with large conspicuous scales that are very shiny. It has large pectoralfinsand a tapering dorsal fin running down the last two thirds of its body, getting progressively higher as it nears the carp's head. Its caudal and anal fins may either be a dark bronze or washed with a rubbery orange hue. There are two or three spines on the anal fin,the first being serrated,and the dorsal fin has three or four anterior spines,the first of which is also serrated.The mouth of the carp is downward-turned, with two pairs ofbarbels, one pair at the corners of the upper lip, and the other on the lower.Wild common carp are typically slimmer than domesticated forms, with body length about four times body height, red flesh, and a forward-protruding mouth. Common carp can grow to very large sizes if given adequate space and nutrients. Their average growth rate by weight is about half the growth rate of domesticated carp.They do not reach the lengths and weights of domesticated carp, which (range, 3.2–4.8 times)can grow to a maximum length of 120 centimetres (47 in), a maximum weight of over 40 kilograms (88 lb).The longest-lived common carp documented was of wild-origin (in non-native habitat of North America), and was 64 years of age.The largest recorded carp, caught by British angler, Colin Smith, in 2013 at Etang La Saussaie Fishery, France, weighed 45.59 kilograms (100.5 lb). The average size of the common carp is around 40–80 cm (16–31 inches) and 2–14 kg (4.4–30.9 lb).
Although tolerant of most conditions, common carp prefer large bodies of slow or standing water and soft, vegetative sediments. As schooling fish, they prefer to be in groups of five or more. They naturally live intemperateclimates infreshor slightlybrackishwater with apHof 6.5–9.0 and salinity up to about 0.5%,and temperatures of 3 to 35 °C (37–95 °F).The ideal temperature is 23 to 30 °C (73–86 °F), with spawning beginning at 17 to 18 °C (63–64 °F); they easily survive winter in a frozen-over pond, as long as some free water remains below the ice.Carp are able to tolerate water with very low oxygen levels, by gulping air at the surface.
Common carp areomnivorous. They can eat a herbivorous diet of aquatic plants, plant tubers, and seeds, but prefer to scavenge the bottom forinsects,crustaceans(includingzooplanktonandcrawfish),molluscs,benthicworms,fisheggs, and fish remains.Common carp feed throughout the day with the most intensive feeding at night and around sunrise.
Common carp are benthic feeders and root in sediment for food items. Their barbels may help to feel for food embedded in the sediment, like plant tubers or annelids.Carp pick up sediment by generating suction and mouth the content to identify and select food items by taste and size. Gill rakers form a branchial sieve that may aid in food separation, but the carp is also able to clamp down on food items it detects using a muscular palatal pad and inferior postlingual organ. The sediment is passed back and forth between the mouth and pharynx repeatedly as food is found. The carp may end up spitting out sediment,which contributes to water turbidity.
While common carp have no oral teeth, tenpharyngeal teethare used for crushing or grinding food.The carp has no stomach,and the intestinal length can vary based partially on dietary composition in early life.
An egg-layer, a typical adult female can lay 300,000 eggs in a singlespawn.Although carp typically spawn in the spring, in response to rising water temperatures and rainfall, carp can spawn multiple times in a season. In commercial operations, spawning is often stimulated using a process called hypophysation, wherelyophilizedpituitary extract is injected into the fish. The pituitary extract contains gonadotropic hormones which stimulate gonad maturation and sex steroid production, ultimately promoting reproduction.
A single carp can lay over a million eggs in a year.Eggs and fry often fall victim to bacteria, fungi, and the vast array of tiny predators in the pond environment. Carp which survive to the juvenile stage are preyed upon by other fish such as thenorthern pikeandlargemouth bass, and severalbirds(includingcormorants,herons,goosanders, andospreys)andmammals(includingotterand mink).
Common carp are quite salt tolerant compared to other types of freshwater fish, research studies showed that they can withstand salinity of at least 12g/L (12ppt).
Mirror carp, regionally known asIsraeli carp,are a type of domesticatedfishcommonly found in Europe but widely introduced or cultivated elsewhere. They are a variety of the common carp (Cyprinus carpio) developed throughselective breeding. The name "mirror carp" originates from their scales' resemblance to mirrors.
The most striking difference between mirror and common carp is the presence of large mirror-like scales on the former. The mirror-scale phenotype is caused by a geneticmutationpresent at one of two scale traitloci, denoted by their S and Nalleles, respectively. Thegenotypethat produces a mirror scale phenotype is "ssnn" (all recessive), while wild-type carp may have either SSnn or Ssnn genotype.The "S" locus has been identified as containing the gene encodingfibroblast growth factor receptorFgfr1A1, which wasduplicatedduring the course of carp evolution and consequently does not typically produce lethal phenotypes when only one locus is mutated.The "N" locus has not been identified,but is hypothesized to have bearing on the development of embryonicmesenchyme.
Contrary to popular belief, a leather carp is not always a mirror carp without scales. Similar to mirror carp, leather, or "nude" carp, are homozygous recessive at the "S" locus, but unlike mirror carp, true leather carp are heterozygous for a dominant mutant allele at the "N" locus (ssNn genotype).Leather carp also have reduced numbers of red blood cells and slower growth rates than scaled carp.Mirror carp from Hungarian and Asian stocks have been observed to have fewerpharyngeal teeththan scaled carp, while nude carp had fewer still.
A population of mirror carp inMadagascar(there aninvasive species) was found to have reverted to full scale cover after being introduced from France in the early twentieth century.The feral Malagasy carp still possessed large scales due to their mirror phenotype, but had increased scale coverage approaching that of wild-type carp.Hubert et al. (2016) found that the recessive allele at the "S" locus was stillfixedin the population.They believe that the phenotypic reversion was due to compensation byquantitative traitloci as a result of aselective disadvantagefor partial scaling in the wild, perhaps related to an impairment in parasite resistance.
Common carp have been introduced to most continents and some 59 countries. In absence of natural predators orcommercial fishing, they may extensively alter their environments due to their reproductive rate and their feeding habit of grubbing through bottom sediments for food. In feeding, they may destroy, uproot, disturb and eat submerged vegetation, causing serious damage tofood sourcesandhabitatsof native duck (such ascanvasbacks) and fish populations.
In 2020, scientists demonstrated that a small proportion of fertilized common carp eggs ingested by waterfowl survive passing through the digestive tract and hatch after being retrieved from the feces.Birds exhibit strong preference for fish eggs, while cyprinids produce hundreds of thousands of eggs at a single spawning event. These data indicate that despite the low proportion of eggs surviving the digestive tract of birds, endozoochory might provide a potentially overlooked dispersal mechanism of invasive cyprinid fish. If proven under natural circumstances, endozoochorous dispersal of invasive fish could be a strong conservation concern for freshwater biodiversity.
Carp were introduced toAustraliaover 150 years ago but were not seen as a recognised pest species until the "Boolarra" strain appeared in the 1960s.After spreading massively through theMurray–Darling basin, aided by massive flooding in 1974,they have established themselves in every Australian territory except for theNorthern Territory.InVictoria, the common carp has been declared a noxious fish species, and thequantitya fisherman can take is unlimited.InSouth Australia, it is an offence for this species to be released back to the wild.An Australian company produces plant fertilizer from carp.
Efforts to eradicate a small colony fromLake CrescentinTasmania, without using chemicals, have been successful, but the long-term, expensive and intensive undertaking is an example of both the possibility and difficulty of safely removing the species once it is established.One proposal, regarded as environmentally questionable, is to control common carp numbers by deliberately exposing them to the carp-specifickoi herpes viruswith its high mortality rate.In 2016, the Australian Government announced plans to release this virus into the Murray–Darling basin in an attempt to reduce the number of invasive common carp in the water system.However, in 2020, this plan was found to be unlikely to work.TheCSIROhas also developed a technique for genetically modifying carp so that they only produce male offspring. Thisdaughterless carpmethod shows promise for totally eradicating carp from Australia's waterways.
Common carp were brought to theUnited Statesin 1831.In the late 19th century, they were distributed widely throughout the country by the government as afood fish, but they are now rarely eaten in the United States, where they are generally considered pests. As in Australia, their introduction has been shown to have negative environmental consequences.
InUtah, the common carp's population inUtah Lakeis expected to be reduced by 75 percent by usingnetsto catch millions of them, and either giving them to people who will eat them or processing them intofertilizer. This, in turn, will give the declining population of the nativeJune suckera chance to recover.Another method of control is to trap them withseine netsin tributaries they use to spawn, and exposing them to thepisciciderotenone. This method has been shown to reduce their impact within 24 hours and greatly increase native vegetation and desirable fish species. It also allows native fish to prey more easily on young carp.
Common carp are thought to have been introduced into the Canadian province ofBritish Columbiafrom the neighboringWashington state. They were first noted in theOkanagan Valleyin 1912, as was their rapid growth in population. Carp are currently distributed in the lowerColumbia(Arrow Lakes), lowerKootenay, Kettle (Christina Lake), and throughout theOkanagansystem.
Common carp contributed around 4.67 million tons on a global scale during 2015–2016, roughly accounting for 7.4% of the total global inland fisheries production. In Europe, common carp contributed 1.8% (0.17 Mt) of the total inland fisheries production (9.42 Mt) during 2015–2016. It is a major farmed species in European freshwater aquaculture with production localized in central and eastern European countries. The Russian Federation (0.06 Mt) followed by Poland (0.02 Mt), Czech Republic (0.02 Mt), Hungary (0.01 Mt) and Ukraine (0.01 Mt) represents about 70% of carp production in Europe during 2016. In fact, the land‐locked central European countries rely heavily on common carp aquaculture in fishponds. The average productivity of carp culture systems in central European countries ranges between 0.3 and 1 ton ha−1. The European common carp production, in terms of volume, reached its peak (0.18 Mt) during 2009–2010 and has been declining since. Carp farming is often criticized as an anthropogenic driver of eutrophication of inland freshwater bodies - especially in the Central Eastern European Region (CEER). There has been some debate between environmentalists and carp farmers concerning eutrophication of water bodies, manifested into lobbying at ministry levels surrounding fishpond legislations.European carp aquaculture infish pondsmost likely has a lower nutrient burden to the environment than most food production sectors in theEuropean Union.
The Romans farmed carp and this pond culture continued through the monasteries of Europe and to this day. In China, Korea, and Japan, carp farming took place as early as theYayoi period(c. 300 BC – AD 300).
The annual tonnage of common carp produced inChinaalone, not to mention the other cyprinids, exceeds the weight of all other fish, such as trout and salmon, produced by aquaculture worldwide. Roughly three million tonnes are produced annually, accounting for 14% of all farmed freshwater fish in 2002. China is by far the largest commercial producer, accounting for about 70% of carp production.Carp is eaten in many parts of the world both when caught from the wild and raised inaquaculture.
Common carp are extremely popular withanglersin many parts of Europe, and their popularity as quarry is slowly increasing among anglers in the United States (though they are still generally considered pests and destroyed in most areas of the U.S.), and southern Canada. Carp are also popular with spear, bow, and fly fishermen.
InCentral Europe, it is a traditional part of aChristmas Evedinner. Hungarianfisherman's soup, a specially prepared fish soup of carp alone or mixed with other freshwater fish, is part of the traditional meal for Christmas Eve in Hungary along with stuffed cabbage and poppy seed roll and walnut roll. A traditional Czech Christmas Eve dinner is a thicksoupof carp's head and offal,fried carp meat(sometimes the meat is skinned and baked instead) withpotato salador boiled carp in black sauce.A Slovak Christmas Eve dinner is quite similar, with soup varying according to the region and fried carp as the main dish. Also inAustria, parts ofGermany, andPoland, a fried carp is one of the traditional dishes on Christmas Eve.Carp are mixed with other common fish to makegefilte fish, popular inJewish cuisine.
InWestern Europe, the carp is cultivated more commonly as a sport fish, although there is a small market for it as a food fish.
In theUnited States, carp is mostly ignored as a food fish. Almost all U.S. shoppers bypass carp, due to a preference for filleted fish as opposed to cooking whole. Carp have smaller intramuscular bones called y-bones, which makes them a whole fish species for cooking.
When Eurasian Carp was introduced toLake TobainSumatra, it was adapted to be used for the traditional dishArsik.