The term carp (pl.: carp) is a generic common name for numerous species of freshwater fish from the family Cyprinidae, a very large clade of ray-finned fish mostly native to Eurasia. While carp are prized quarries and are valued (even commercially cultivated) as both food and ornamental fish in many parts of the Old World, [1] they are considered trash fish and invasive pests in many parts of Africa, Australia and most of the United States. [2] [3]
The cypriniformes (family Cyprinidae) are traditionally grouped with the Characiformes, Siluriformes, and Gymnotiformes to create the superorder Ostariophysi, since these groups share some common features. These features include being found predominantly in fresh water and possessing Weberian ossicles, an anatomical structure derived from the first five anterior-most vertebrae, and their corresponding ribs and neural crests.
The third anterior-most pair of ribs is in contact with the extension of the labyrinth and the posterior with the swim bladder. The function is poorly understood, but this structure is presumed to take part in the transmission of vibrations from the swim bladder to the labyrinth and in the perception of sound, which would explain why the Ostariophysi have such a great capacity for hearing. [4]
Most cypriniformes have scales and teeth on the inferior pharyngeal bones which may be modified in relation to the diet. Tribolodon is the only cyprinid genus which tolerates salt water. Several species move into brackish water but return to fresh water to spawn. All of the other cypriniformes live in continental waters and have a wide geographical range. [4] Some consider all cyprinid fishes carp[ by whom? ], and the family Cyprinidae itself is often known as the carp family.
In colloquial use, carp usually refers only to several larger cyprinid species such as Cyprinus carpio (common carp), Carassius carassius (crucian carp), Ctenopharyngodon idella (grass carp), Hypophthalmichthys molitrix (silver carp), and Hypophthalmichthys nobilis (bighead carp). Common carp are native to both Eastern Europe and Western Asia, [5] so they are sometimes called a "Eurasian" carp.
Carp have long been an important food fish to humans. Several species such as the various goldfish (Carassius auratus) breeds and the domesticated common carp variety known as koi (Cyprinus rubrofuscus var. "koi") have been popular ornamental fishes. As a result, carp have been introduced to various locations, though with mixed results. Several species of carp are considered invasive species in the United States, [6] and, worldwide, large sums of money are spent on carp control. [7]
At least some species of carp are able to survive for months with practically no oxygen (for example under ice or in stagnant, scummy water) by metabolizing glycogen to form lactic acid which is then converted into ethanol and carbon dioxide. The ethanol diffuses into the surrounding water through the gills. [8] [9] [10]
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| Common name | Scientific name | Max length (cm) | Common length (cm) | Max weight (kg) | Max age (yr) | Trophic level | Fish Base | FAO | ITIS | IUCN status |
| Silver carp | Hypophthalmichthys molitrix(Valenciennes, 1844) | 105 | 18 | 50 | 2.0 | [11] | [12] | [13] |  Near threatened [14] | |
| Common carp (European carp) | Cyprinus carpio(Linnaeus, 1758) | 110 | 31 | 40.1 | 38 | 3.0 | [15] | [16] | [17] |  Vulnerable [18] |
| Grass carp | Ctenopharyngodon idella(Valenciennes, 1844) | 150 | 10.7 | 45.0 | 21 | 2.0 | [19] | [20] | Not assessed | |
| Bighead carp | Hypophthalmichthys nobilis(Richardson, 1845) | 146 | 60 | 40.0 | 20 | 2.3 | [21] | [22] |  Data deficient [23] | |
| Crucian carp | Carassius carassius(Linnaeus, 1758) | 64 | 15 | 3.0 | 10 | 3.1 | [24] | [25] |  Least concern [23] | |
| Catla carp (Indian carp) | Cyprinus catla(Hamilton, 1822) | 182 | 38.6 | 2.8 | [26] | [27] | Not assessed | |||
| Mrigal carp | Cirrhinus cirrhosus(Bloch, 1795) | 100 | 40 | 12.7 | 2.5 | [28] | [29] | Vulnerable [30] | ||
| Black carp | Mylopharyngodon piceus(Richardson, 1846) | 122 | 12.2 | 35 | 13 | 3.2 | [31] | [32] | Not assessed | |
| Mud carp | Cirrhinus molitorella(Valenciennes, 1844) | 55.0 | 15.2 | 0.50 | 2.0 | [33] | [34] | Near threatened [18] | ||
| Caspian roach | Rutilus caspicus(Yakovlev, 1870) | 45 | 32.5 | 2 | [35] | Least concern [36] | ||||
In 1653 Izaak Walton wrote in The Compleat Angler , "The Carp is the queen of rivers; a stately, a good, and a very subtle fish; that was not at first bred, nor hath been long in England, but is now naturalised."
Carp are variable in terms of angling value.
Various species of carp have been domesticated and reared as food fish across Europe and Asia for thousands of years. These various species appear to have been domesticated independently, as the various domesticated carp species are native to different parts of Eurasia. Aquaculture has been pursued in China for at least 2,400 years. A tract by Fan Li in the fifth century BC details many of the ways carp were raised in ponds. [48] The common carp (Cyprinus carpio) is originally from Central Europe. [49] Several carp species (collectively known as Asian carp) were domesticated in East Asia. Carp that are originally from South Asia, for example catla (Gibelion catla), rohu (Labeo rohita) and mrigal (Cirrhinus cirrhosus), are known as Indian carp. Their hardiness and adaptability have allowed domesticated species to be propagated all around the world.
Although the carp was an important aquatic food item, as more fish species have become readily available for the table, the importance of carp culture in Western Europe has diminished. Demand has declined, partly due to the appearance of more desirable table fish such as trout and salmon through intensive farming, and environmental constraints. However, fish production in ponds is still a major form of aquaculture in Central and Eastern Europe, including the Russian Federation, where most of the production comes from low or intermediate-intensity ponds. In Asia, the farming of carp continues to surpass the total amount of farmed fish volume of intensively sea-farmed species, such as salmon and tuna. [50]
Selective breeding programs for the common carp include improvement in growth, shape, and resistance to disease. Experiments carried out in the USSR used crossings of broodstocks to increase genetic diversity, and then selected the species for traits such as growth rate, exterior traits and viability, and/or adaptation to environmental conditions such as variations in temperature. [51] [52] Selected carp for fast growth and tolerance to cold, the Ropsha carp.[ citation needed ] The results showed a 30 to 77.4% improvement of cold tolerance, but did not provide any data for growth rate. An increase in growth rate was observed in the second generation in Vietnam, [53] Moav and Wohlfarth (1976) showed positive results when selecting for slower growth for three generations compared to selecting for faster growth. [54] Schaperclaus (1962) showed resistance to the dropsy disease wherein selected lines suffered low mortality (11.5%) compared to unselected (57%). [55]
The major carp species used traditionally in Chinese aquaculture are the black, grass, silver and bighead carp. In the 1950s, the Pearl River Fishery Research Institute in China made a technological breakthrough in the induced breeding of these carps, which has resulted in a rapid expansion of freshwater aquaculture in China. [56] In the late 1990s, scientists at the Chinese Academy of Fishery Sciences developed a new variant of the common carp called the Jian carp (Cyprinus carpio var. Jian). This fish grows rapidly and has a high feed conversion rate. Over 50% of the total aquaculture production of carp in China has now converted to Jian carp. [56] [57]
| The major traditional aquaculture carp of China | |||
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Carp, along with many of their cyprinid relatives, are popular ornamental aquarium and pond fish.
Ornamental goldfish were originally domesticated from their wild form, a dark greyish-brown carp native to Asia, but may have been influenced by Carassius carassius and Carassius gibelio . They were first bred for color in China over a thousand years ago. Due to selective breeding, goldfish have been developed into many distinct breeds, and are found in various colors, color patterns, forms and sizes far different from those of the original carp. Goldfish were kept as ornamental fish in China for thousands of years before being introduced to Japan in 1603, and to Europe in 1611. [58]
Nishikigoi, better known simply as koi, are a domesticated varieties of common carp and Amur carp (Cyprinus rubrofuscus) that have been selectively bred for color. The common carp was introduced from China to Japan, where selective breeding in the 1820s in the Niigata region resulted in koi. [59] In Japanese culture, koi are treated with affection, and seen as good luck. [60] They are popular in other parts of the world as outdoor pond fish. [61]
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 The original Chinese character for "carp" in seal script (top), Traditional (middle), and Simplified (bottom) characters | |||||||||||||||||||
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| Traditional Chinese | 鯉魚 | ||||||||||||||||||
| Simplified Chinese | 鲤鱼 | ||||||||||||||||||
| Literal meaning | "carp-fish" | ||||||||||||||||||
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A long tradition of common carp exists in Chinese culture and literature. A popular lyric circulating as early as 2,000 years ago in the late Han period includes an anecdote which relates how a man far away from home sent back to his wife a pair of carp (Chinese :鲤鱼; pinyin :Liyu),in which,when the wife opened the fish to cook,she found a silk strip that carried a love note of just two lines:"Eat well to keep fit,missing you and forget me not".
At the Yellow River at Henan (Chinese :河南; pinyin :Hénán; Wade–Giles :Ho-nan) is a waterfall called the Dragon Gate. It is said that if certain carp called yulong can climb the cataract,they will transform into dragons. Every year in the third month of spring,they swim up from the sea and gather in vast numbers in the pool at the foot of the falls. It used to be said that only 71 could make the climb in any year. When the first succeeded,then the rains would begin to fall. This Dragon Gate was said to have been created after the flood by the god-emperor Yu,who split a mountain blocking the path of the Yellow River. It was so famous that throughout China was a common saying,"a student facing his examinations is like a carp attempting to leap the Dragon Gate."
Henan is not the only place where this happens. Many other waterfalls in China also have the name Dragon Gate and much the same is said about them. Other famous Dragon Gates are on the Wei River where it passes through the Lung Sheu Mountains and at Tsin in Shanxi Province.
The fish's jumping feature is set in such a proverbial idiom as "Liyu (Carp) jumps over the Dragon Gate (Chinese :鲤跃龙门)," an idiom that conveys a vivid image symbolizing a sudden uplifting in one's social status,as when one ascends into the upper society or has found favor with the royal or a noble family,perhaps through marriage,but in particular through success in the imperial examination. It is therefore an idiom often used to encourage students or children to achieve success through hard work and perseverance. This symbolic image,as well as the image of the carp itself,has been one of the most popular themes in Chinese paintings,especially those of popular styles. The fish is usually colored in gold or pink,shimmering with an unmistakably auspicious tone.
The modern Japanese Koi fish are a brightly colored species of the Amur carp that have been bred by rice farmers in Japan since the early 19th century. [66] This subspecies of carp plays a significant role in Japanese art,often being depicted as symbols of luck,strength,and tenacity. [67] For this reason,Koi fish are also presented as gifts in Japanese culture as symbols of love,gratitude,and peace. Their bright colors and unique patterns present a high degree of eloquence to the Japanese people,thus creating a level of respect and appreciation for the Koi.
With Koi fish being at the forefront of a lot of Japanese art,it is common to find modern depictions of Koi in paintings,home art,murals,and even tattoos.
To many people,Koi fish strongly represent Samurai warriors,as they are able to be seen swimming upwards against a rivers current,symbolizing a Samurai's bravery. One typical saying is the phrase "koi no taki-nobori",translating to "Carp climbing the waterfalls",a phrase that is used to describe a persons strength and perseverance. [68]
Cyprinidae is a family of freshwater fish commonly called the carp or minnow family,including the carps,the true minnows,and their relatives the barbs and barbels,among others. Cyprinidae is the largest and most diverse fish family,and the largest vertebrate animal family overall,with about 3,000 species;only 1,270 of these remain extant,divided into about 200 valid genera. Cyprinids range from about 12 mm (0.5 in) in size to the 3 m (9.8 ft) giant barb. By genus and species count,the family makes up more than two-thirds of the ostariophysian order Cypriniformes. The family name is derived from the Greek word kyprînos.
Koi,or more specifically nishikigoi,are colored varieties of carp that are kept for decorative purposes in outdoor koi ponds or water gardens.
The Eurasian carp or European carp,widely known as the common carp,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 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.
Cyprinus is the genus of typical carps in family Cyprinidae. Most species in the genus are of East Asia origin with only the common carp in Western Asia and Europe;this invasive species has also been introduced to many other regions around the world. Cyprinus are closely related to some more barb-like genera,such as Cyclocheilichthys and Barbonymus (tinfoils). The crucian carps (Carassius) of western Eurasia,which include the goldfish,are apparently not as closely related.
Asian carp is an informal grouping of several species of cyprinid freshwater fishes native to Eurasia,commonly referring to the four East Asian species silver carp,bighead carp,grass carp and black carp,which were introduced to North America during the 1970s and now regarded as invasive in the United States. These four species,now also known commercially as copi in the United States,are staple food fish in their native China,where they are collectively known as qing cao lian yong (青草鲢鳙) or si da jia yu and are farmed extensively.
The grass carp is a species of large herbivorous freshwater fish in the family Cyprinidae,native to the Pacific Far East,with a native range stretching from northern Vietnam to the Amur River on the Sino-Russian border. This Asian carp is the only species of the genus Ctenopharyngodon.
Catla,also known as the major South Asian carp,is an economically important South Asian freshwater fish in the carp family Cyprinidae. It is native to rivers and lakes in northern India,Bangladesh,Myanmar,Nepal,and Pakistan,but has also been introduced elsewhere in South Asia and is commonly farmed.
The bighead carp is a species of cyprinid freshwater fish native to East Asia,and is one of several Asian carps introduced into North America. It is one of the most intensively exploited fishes in fish farming,with an annual worldwide production of over three million tonnes in 2013,principally from China. Unlike the omnivorous common carp,bighead carp are primarily filter-feeding algae eaters,preferentially consuming zooplankton but also phytoplankton and detritus.
The silver carp or silverfin is a species of freshwater cyprinid fish,a variety of Asian carp native to China and eastern Siberia,from the Amur River drainage in the north to the Xi Jiang River drainage in the south. Although a threatened species in its natural habitat,it has long been cultivated in China as one of the "Four Famous Domestic Fish" (四大家鱼) together with Bighead carp,Black carp and Grass carp. By weight,more silver carp are produced worldwide in aquaculture than any other species of fish except for the grass carp. Silver carp are usually farmed in polyculture with other Asian carp,or sometimes with catla or other fish species.
Hypophthalmichthys is a genus of large cyprinid fish consisting of three species. The name comes from Greek ὑπό,ὀφθαλμός,and ἰχθῦς,thus 'fish with eyes below',referring to the fact that the fish has its eyes below the mouth line. Members of this genus are native to fresh water in East Asia,ranging from Siberia to Vietnam,but have been widely introduced outside their native range,where often considered invasive. Big head and silver carps have been reaching the Illinois River system outside of Lake Michigan but have grown concerns of them likely being established in the Great Lakes. The reason is that stakeholders,such as fisheries,recreationists,and the fishing industry can be impacted economically and potentially decrease biodiversity or even extinction of these or other species. Environmental DNA has been used to monitor these species and look for positive eDNA detections and the presence of live organisms. The genus is also known as Bighead carp,though that term is also used for individual species,particularly Hypophthalmichthys nobilis. The Russian language has a special word for the genus - tolstolób(ik).
The fishing industry in the land-locked country of Laos is a major source of sustenance and food security to its people dwelling near rivers,reservoirs and ponds. Apart from wild capture fisheries,which is a major component of fish production,aquaculture and stocking are significant developments in the country. Historically,fishing activity was recorded in writings on the gate and walls of the Wat Xieng Thong in Luang Prabang dated 1560. For many Laotians,freshwater fish are the principal source of protein. The percentage of people involved in regular fishing activity is very small,only near major rivers or reservoirs,as for most of the fishers it is a part-time activity.
Carp is a common name for various species of freshwater fish from the family Cyprinidae that are native to Eurasia and sought after by some recreational fishermen. Certain carp species have been introduced,with mixed results,to various other locations around the world,and even declared invasive in certain regions.
The Japanese white crucian carp,also known as Japanese carp,white crucian carp,or gengoro-buna,is a species of freshwater fish in the carp family. It is found in Japan and,as an introduced species,in several other countries in Asia. This fish is closely related to the commonly known goldfish.
The mrigal carp,also known as the white carp,is a species of ray-finned fish in the carp family. Native to streams and rivers in India,the only surviving wild population is in the Cauvery River,leading to its IUCN rating as vulnerable. It is widely aquafarmed,and introduced populations exist outside its native range. It reaches a maximum length of 1 m (3.3 ft). This species and Cirrhinus mrigala are considered distinct.
Cirrhinus molitorella is a species of ray-finned fish in the genus Cirrhinus found mainly in southern China and Vietnam.
Cyprinus rubrofuscus,the Amur carp,is a species of cyprinid fish,and is the wild form of the well-known koi. It is widespread in the fresh waters of eastern Asia,native to China,Korea,Russia,Vietnam and Laos from the Amur to Red River basins,and has also been introduced outside its native range. It is known for its muddy flavor and boniness,hence,it is not commonly eaten by locals except when stewed.
The crucian carp is a medium-sized member of the common carp family Cyprinidae. It occurs widely in northern European regions. Its name derives from the Low German karusse or karutze,possibly from Medieval Latin coracinus.
The ginbuna,sometimes referred to as silver crucian carp or Japanese silver crucian carp,is a species of freshwater fish in the carp family. It is native to lakes and rivers in Japan.
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