The common carp or European carp (Cyprinus carpio) is a widespread freshwater fish of eutrophic waters in lakes and large rivers in Europe and Asia. The native wild populations are considered vulnerable to extinction by the International Union for Conservation of Nature (IUCN), but the species has also been domesticated and introduced (see aquaculture) into environments worldwide, and is often considered a destructive invasive species, being included in the list of the world's 100 worst invasive species. It gives its name to the carp family, Cyprinidae.
The two subspecies are:
- C. c. carpio is native to much of Europe (notably the Danube and Volga Rivers).
- C. c. yilmaz (Deniz carp) is from Anatolian Turkey (notably around Çorum).
A third subspecies, C. c. haematopterus (Amur carp) native to eastern Asia, was recognized in the past, but recent authorities treat it as a separate species under the name C. rubrofuscus. The common carp and various Asian relatives in the pure forms can be separated by meristics and also differ in genetics, but they are able to interbreed. Common carp can also interbreed with the goldfish (Carassius auratus); the result is called Kollar carp.
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 the Danube River about 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 the Black Sea, Caspian Sea and Aral Sea.
Both European and Asian subspecies have been domesticated. In Europe, domestication of carp as food fish was spread by monks between the 13th and 16th centuries. The wild forms of carp had already reached the delta of the Rhine in the 12th century, probably with some human help. Variants that have arisen with domestication include the mirror carp, with large, mirror-like scales (linear mirror – scaleless except for a row of large scales that run along the lateral line; originating in Germany), the leather carp (virtually unscaled except near dorsal fin), and the fully scaled carp. Koi carp (錦鯉 (nishikigoi) in Japanese, 鯉魚 (pinyin: lĭ yú) in Chinese) is a domesticated ornamental variety that originated in the Niigata region of Japan in the 1820s, but its parent species are likely the East Asian carp, possibly C. rubrofuscus.
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), and an oldest recorded age of 38 years. The largest recorded carp, caught by an angler in January 2010 at Lac de curtons (Rainbow Lake) near Bordeaux, France, weighed 42.6 kilograms (94 lb). 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 (15.75-31.5 inches) and 2–14 kg (4.5-31 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 in temperate climates in fresh or slightly brackish water with a pH of 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.
An egg-layer, a typical adult female can lay 300,000 eggs in a single spawn. 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, where lyophilized pituitary 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, yet their population remains the same, so the eggs and young perish in similarly vast numbers. Eggs and fry often fall victim to bacteria, fungi, and the vast array of tiny predators in the pond environment. Carp which survive to juvenile are preyed upon by other fish such as the northern pike and largemouth bass, and a number of birds (including cormorants, herons, goosanders, and ospreys) and mammals (including otter and mink).
Introduction into other habitats
Common carp have been introduced to most continents and some 59 countries. In absence of natural predators or commercial 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 to native duck, such as canvasbacks, and fish populations.
Carp were introduced to Australia over 100 years ago and, after spreading massively through the Murray–Darling basin, have established themselves in every Australian territory except for the Northern Territory. In Victoria, the common carp has been declared a noxious fish species, and the quantity a fisher can take is unlimited. In South 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 from Lake Crescent in Tasmania, 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 by deliberate exposing them to carp-specific koi herpes virus with its high mortality rate. The CSIRO has developed a technique for genetically modifying carp so that they only produce male offspring. This daughterless carp method shows promise for totally eradicating carp from Australia's waterways.
Common carp were brought to the United States in 1831. In the late 19th century, they were distributed widely throughout the country by the government as a food-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, and they are usually considered to be invasive species.
In Utah, the common carp's population in Utah Lake is expected to be reduced by 75 percent by using nets to catch millions of them, and either giving them to people who will eat them or processing them into fertilizer. This, in turn, will give the declining population of the native June sucker a chance to recover. Another method of control is to trap them with seine nets in tributaries they use to spawn, and exposing them to the piscicide rotenone. 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 of British Columbia from Washington state. They were first noted in the Okanagan Valley in 1912, as was their rapid growth in population. Carp are currently distributed in the lower Columbia (Arrow Lakes), lower Kootenay, Kettle (Christina Lake), and throughout the Okanagan system.
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 dipite 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.
Common carp aquaculture
Common carp contributed around 4.67 million tons (Mt) 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 in fish ponds most likely has the least nutrient burden to the environment than most food production sectors in the EU.
As food and sport
Cyprinus carpio is the number 3 fish of aquaculture after grass carp and silver carp.[circular reference] The annual tonnage of common carp produced in China alone, 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 in aquaculture.
In Central Europe, it is a traditional part of a Christmas Eve dinner. Hungarian fisherman'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 thick soup of carp's head and offal, fried carp meat with potato salad or boiled carp in black sauce. In some Czech families, the carp is not killed, but after Christmas returned to a river or pond. A Slovak Christmas Eve dinner is quite similar, with soup varying according to the region and fried carp as the main dish. Also in Austria, parts of Germany and Poland, a fried carp is one of the traditional dishes on the Christmas Eve.
In Western Europe, the carp is cultivated more commonly as a sport fish, although there is a small market for it as a food fish. Carp are mixed with other common fish to make gefilte fish, popular in Jewish cuisine. Common carp are extremely popular with anglers in 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.
In the U.S., carp is mostly ignored as a food fish. Almost all U.S. shoppers bypass carp, due to their great need 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.
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 the Yayoi Period (c. 300 BC – AD 300).
- Freyhof, J. & Kottelat, M. (2008). "Cyprinus carpio". IUCN Red List of Threatened Species. 2008: e.T6181A12559362. doi:10.2305/IUCN.UK.2008.RLTS.T6181A12559362.en.
- Fishbase: Cyprinus carpio Linnaeus, 1758
- Arkive: Common carp (Cyprinus carpio) Archived 2010-01-01 at the Wayback Machine
- Jian Feng Zhou, Qing Jiang Wu, Yu Zhen Ye & Jin Gou Tong (2003). Genetic divergence between Cyprinus carpio carpio and Cyprinus carpio haematopterus as assessed by mitochondrial DNA analysis, with emphasis on origin of European domestic carp Genetica 119: 93–97
- Craig, J.F., eds. (2015). Freshwater Fisheries Ecology. p. 297. Wiley-Blackwell. ISBN 978-1-118-39442-7.
- Zhou, J., Wu, Q., Wang, Z. and Ye, Y. (2004). Molecular Phylogenetics of Three Subspecies of Common carp Cyprinus Carpio, based on sequence analysis of cytochrome b and control region of mtDNA. Journal of Zoological Systematics and Evolutionary Research 42(4): 266–269.
- Taylor, J., R. Mahon. 1977. Hybridization of Cyprinus carpio and Carassius auratus, the first two exotic species in the lower Laurentian Great Lakes. Environmental Biology Of Fishes 1(2):205-208.
- Photo of goldfish x common carp hybrid Archived 2007-10-17 at the Wayback Machine in Melton Hill Reservoir from the Tennessee Wildlife Resources Agency
- Courtenay, Walter R.; Welcomme, R. L. (1989-05-23). "International Introductions of Inland Aquatic Species". Copeia. 1989 (2): 520. doi:10.2307/1445460. ISSN 0045-8511. JSTOR 1445460.
- Balon, Eugene K. (1974), "Probable Origin of Domestication", Domestication of the carp Cyprinus caprio L., Royal Ontario Museum, pp. 16–18
- "Common Carp." Aliens Among Us. N.p., n.d. Web. 27 Oct. 2014. <http://alienspecies.royalbcmuseum.bc.ca/eng/species/common-carp>[permanent dead link];.
- "Balon, E. K. (2004). About the oldest domesticates among fishes. Journal of Fish Biology, 65 (Supplement A): 1–27. In Carp Fishing Science". Archived from the original on 2010-05-03. Retrieved 2019-02-16.
- "Aanvullend Archeologisch Onderzoek op terrein 9 te Houten-Loerik, gemeente Houten (U.)" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2014-08-06.
- "Ray Jordan Koi History". Archived from the original on 2009-07-23. Retrieved 2009-04-20.
- Wilt, R.S. de; Emmerik W.A.M. (2008-01-31). "Kennisdocument Karper Sportvisserij Nederland". Archived from the original on 2012-01-03. Retrieved December 13, 2011.
- Füllner G.; Pfeifer M.; Langner N. "Karpfenteichwirtschaft" (PDF). Sächsische Landesanstalt für Landwirtschaft. Archived from the original (PDF) on 2012-04-15. Retrieved December 13, 2011.
- Lac de curtons Archived 2010-01-25 at the Wayback Machine (in French)
- Food and Agriculture Organization Fisheries & Aquaculture: Cultured Aquatic Species Information Programme – Cyprinus carpio
- "Carp". BadAngling. Retrieved 2018-07-06.
- "Carp Fishing for carp fishing information". Carp-fishing.org. Archived from the original on 2017-02-21. Retrieved 2011-12-03.
- Cramp, S. (ed.). The Birds of the Western Palearctic volumes 1 (1977) & 2 (1980). OUP.
- "Welcome to". Lakeconservation.com. 2010-01-15. Archived from the original on 2013-01-27. Retrieved 2011-12-03.
- Lackmann, Alec R.; Andrews, Allen H.; Butler, Malcolm G.; Bielak-Lackmann, Ewelina S.; Clark, Mark E. (2019-05-23). "Bigmouth Buffalo Ictiobus cyprinellus sets freshwater teleost record as improved age analysis reveals centenarian longevity". Communications Biology. 2 (1): 197. doi:10.1038/s42003-019-0452-0. ISSN 2399-3642. PMC 6533251. PMID 31149641.
- "Reducing Australia's carp invasion". CSIRO. Archived from the original on 2019-07-23. Retrieved 2019-07-23.
- Victorian Recreational Fishing Guide 2006-2007
- "fishsa.com". Archived from the original on 2013-07-03. Retrieved 2007-03-11.
- carp as fertilizer Archived 2007-01-25 at the Wayback Machine
- Kelly, Margot (February 5, 2020). "Carp success, after long battle against invasive fish, has trout faithful rejoicing". ABC News. Retrieved June 6, 2020.
-  Archived October 7, 2010, at the Wayback Machine
- "USGS Nonindigenous Aquatic Species Program". Archived from the original on 2009-05-10. Retrieved 2017-08-28.
- Maffly, Brian (September 1, 2015). "Utah Lake carp census gauges whether evictions-by-the-ton are succeeding". The Salt Lake Tribune. Archived from the original on April 29, 2017. Retrieved May 22, 2017.
- Cyprinus carpio (Linnaeus) Archived 2007-09-28 at the Wayback Machine on Living Landscapes, from the Royal British Columbia Museum
- "Experiment shows it is possible for fish to migrate via ingestion by birds". phys.org. Retrieved 5 July 2020.
- Lovas-Kiss, Ádám; Vincze, Orsolya; Löki, Viktor; Pallér-Kapusi, Felícia; Halasi-Kovács, Béla; Kovács, Gyula; Green, Andy J.; Lukács, Balázs András (18 June 2020). "Experimental evidence of dispersal of invasive cyprinid eggs inside migratory waterfowl". Proceedings of the National Academy of Sciences. doi:10.1073/pnas.2004805117. ISSN 0027-8424. Retrieved 5 July 2020.
- Roy, K., Vrba, J., Kaushik, S.J. and Mraz, J. (2020), Feed‐based common carp farming and eutrophication: is there a reason for concern?. Rev Aquacult. doi:10.1111/raq.12407
- FAO FishStat (2017) Fisheries and Aquaculture Software. FishStat Plus – Universal Software for Fishery Statistical Time Series. FAO Fisheries and Aquaculture Department [online], Rome. Updated 14 September 2017. [Cited 20 Apr 2018.] Available from URL: http://www.fao.org/fishery/
- Roy, Koushik; Vrba, Jaroslav; Kaushik, Sadasivam J.; Mraz, Jan (October 2020). "Nutrient footprint and ecosystem services of carp production in European fishponds in contrast to EU crop and livestock sectors". Journal of Cleaner Production. 270: 122268. doi:10.1016/j.jclepro.2020.122268. Retrieved 15 June 2020.
- List of commercially important fish species
-  Archived July 23, 2011, at the Wayback Machine
-  Archived January 2, 2015, at the Wayback Machine
- Daily Yomiuri newspaper, September 19, 2008
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