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Do you know that the Koi is  is just a colored version of the Amur carp?
Koi is an informal group of the colored variants of the Amur carp.
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Koi
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Koi
Koi is an informal group of the colored variants of the Amur carp. Several varieties are recognized by the Japanese. Koi varieties are distinguished by coloration, patterning, and scalation. Some of the major colors are white, black, red, yellow, blue, and cream. The most popular category of koi is the "Gosanke", which is made up of the "Kohaku", "Taisho Sanshoku", and "Showa Sanshoku" varieties. Carp are a large group of fish originally found in Central Europe and Asia. Various carp species were originally domesticated in East Asia, where they were used as food fish. Carp are coldwater fish, and their ability to survive and adapt to many climates and water conditions allowed the domesticated species to be propagated to many new locations, including Japan.
Common carp
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 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:  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".
Asian carp
Several species of heavy-bodied cyprinid fishes are collectively known in the United States as Asian carp. Cyprinids from the Indian subcontinent, for example, "catla" ("Catla catla") and "mrigal" ("Cirrhinus cirrhosus") are not included in this classification, and are known collectively as "Indian carp". Ten Asian carp have been substantially introduced outside their native ranges:   All the above, except largescale silver carp, have been cultivated in aquaculture in China for over 1,000 years. Largescale silver carp, a more southern species, is native to Vietnam and is cultivated there. Grass, silver, bighead, and black carp are known as the "Four Domesticated Fish" in China and are the most important freshwater fish species for food and traditional Chinese medicine.
Butterfly Koi
Butterfly koi, longfin koi, or dragon carp are a type of ornamental fish notable for their elongated finnage. The fish are a breed of the common carp, "Cyprinus carpio", which includes numerous wild carp races as well as domesticated koi ("Nishikigoi"). Butterfly koi originated in the mid-20th century as a result of an effort to increase the hardiness of traditional koi. Japanese breeders interbred wild Indonesian longfin river carp with traditional koi. The resulting fish had longer fins, long barbells, pompom nostrils, and were hardier than koi. These were known in Japan as "onagaoi" or "hire naga goi", or translated in English "long tail carp".
Petre P. Carp
Petre P. Carp (; also Petrache Carp, Francized "Pierre Carp", occasionally "Comte Carpe"; 28 or 29 June 1837  – 19 June 1919) was a Moldavian, later Romanian statesman, political scientist and culture critic, one of the major representatives of Romanian liberal conservatism, and twice the country's Prime Minister (1900–1901, 1910–1912). His youth was intertwined with the activity of "Junimea" club, which he co-founded with critic Titu Maiorescu as a literary society, and then helped transform it into a political club. He left behind a budding career as "Junimea"s polemicist and cultural journalist, joining the state bureaucracy of the United Principalities, the Romanian diplomatic corps, and ultimately electoral politics.
Carp
Carp are various species of oily freshwater fish from the family Cyprinidae, a very large group of fish native to Europe and Asia. 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.
Asian carp in North America
Introduced Asian carp in North America pose a major threat to the ecology, environment, economy, and way of life in the Upper Midwest and Great Lakes region of the United States and Canada. Asian carp are a group of fish species, which include several known to be invasive, and represent the most urgent potential danger to the ecology of the Great Lakes. The United States Department of the Interior and United States Fish and Wildlife Service presented their first annual report to Congress on the issue in December 2014. The group of fish species known in the United States as Asian carp, include several which are invasive.