0_Wizard
I have a koi pond at home.  Koi are considered colored varieties of Amur carp.
Koi is an informal group of the colored variants of the Amur carp.
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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.
Koi pond
Koi ponds are ponds used for holding koi, usually as part of a landscape. Koi ponds can be designed specifically to promote health and growth of the Nishikigoi or Japanese Ornamental Carp. The architecture of the koi pond can have a great effect on the health and well being of the koi. The practice of keeping koi often revolves around "finishing" a koi at the right time. The concept of finishing means that the fish has reached its highest potential. Koi clubs hold shows where koi keepers bring their fish for judging. The skimmer allows water to be drawn from the surface of the pond. It collects leaves, pollen, twigs, uneaten food and all other kinds of floating debris.
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".
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".
Koi Pond (The Office)
"Koi Pond" is the 8th episode of the sixth season of the U.S. comedy series "The Office" and the show's 108th episode overall. It was written by Warren Lieberstein and Halsted Sullivan and directed by Reggie Hudlin. It originally aired on NBC on October 29, 2009. The series—presented as if it were a real documentary—depicts the everyday lives of office employees in the Scranton, Pennsylvania, branch of the fictional Dunder Mifflin Paper Company. In this episode, Michael and Jim head off to a meeting and Michael comes back soaked after having fallen in a koi pond. Meanwhile, Pam and Andy, as the two worst salespeople in the branch, have to go cold calling for sales.
Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish. A relatively small member of the carp family (which also includes the Prussian carp and the crucian carp), the goldfish is native to East Asia. It was first selectively bred in Ancient China more than a thousand years ago, and several distinct breeds have since been developed. Goldfish breeds vary greatly in size, body shape, fin configuration and colouration (various combinations of white, yellow, orange, red, brown, and black are known). Starting in ancient China, various species of carp (collectively known as Asian carp) have been bred and reared as food fish for thousands of years.
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.
1_Apprentice
Oh interesting, Ive been actually wanting to get some for my small pond, Are they hard to take care of? 
0_Wizard
Not really.  They are coldwater fish and they have a great ability to adapt to many different climates. 
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.
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Marine aquarium
A marine aquarium is an aquarium that keeps marine plants and animals in a contained environment. Marine aquaria are further subdivided by hobbyists into fish only (FO), fish only with live rock (FOWLR), and reef aquaria. Fish only tanks often showcase large or aggressive marine fish species and generally rely on mechanical and chemical filtration. FOWLR and reef tanks use live rock, a material composed of coral skeletons harboring beneficial nitrogen waste metabolizing bacteria, as a means of more natural biological filtration. Marine fishkeeping is different from its freshwater counterpart because of the fundamental differences in the constitution of saltwater and the resulting differences in the adaptation of its inhabitants.
Coldwater fish
Coldwater fish, in the context of aquariums, refers to fish species that prefer colder water temperatures than average tropical fish, typically below . Some examples are koi and goldfish. These species tend to grow more slowly and live longer than fish that live in warmer waters, and are generally felt to be easier to keep. Coldwater fish are fish such as goldfish, koi, and other members of the carp family that are able to survive in cold water temperatures. When kept in a household aquarium, they do not require a heater and are quite comfortable at around 60 °F (15 °C). These fish are also desirable choices for outdoor ponds and can stand temperatures down to 10 °C.
Freshwater fish
Freshwater fish are those that spend some or all of their lives in fresh water, such as rivers and lakes, with a salinity of less than 0.05%. These environments differ from marine conditions in many ways, the most obvious being the difference in levels of salinity. To survive fresh water, the fish need a range of physiological adaptations. 41.24% of all known species of fish are found in fresh water. This is primarily due to the rapid speciation that the scattered habitats make possible. When dealing with ponds and lakes, one might use the same basic models of speciation as when studying island biogeography.
Fish farming
Fish farming or pisciculture involves raising fish commercially in tanks or enclosures such as fish ponds, usually for food. It is the principal form of aquaculture, while other methods may fall under mariculture. A facility that releases juvenile fish into the wild for recreational fishing or to supplement a species' natural numbers is generally referred to as a fish hatchery. Worldwide, the most important fish species produced in fish farming are carp, tilapia, salmon, and catfish. Demand is increasing for fish and fish protein, which has resulted in widespread overfishing in wild fisheries. China provides 62% of the world's farmed fish.
Aquaponics
Aquaponics () refers to any system that combines conventional aquaculture (raising aquatic animals such as snails, fish, crayfish or prawns in tanks) with hydroponics (cultivating plants in water) in a symbiotic environment. In normal aquaculture, excretions from the animals being raised can accumulate in the water, increasing toxicity. In an aquaponic system, water from an aquaculture system is fed to a hydroponic system where the by-products are broken down by nitrifying bacteria initially into nitrites and subsequently into nitrates, which are utilized by the plants as nutrients, and the water is then recirculated back to the aquaculture system.
Climatic adaptation
Climatic adaptation refers to adaptations of an organism that are triggered due to the patterns of variation of abiotic factors that determine a specific climate. Annual means, seasonal variation and daily patterns of abiotic factors are properties of a climate where organisms can be adapted to. Changes in behavior, physical structure, internal mechanisms and metabolism are forms of adaptation that is caused by climate properties. Organisms of the same species that occur in different climates can be compared to determine which adaptations are due to climate and which are influenced majorly by other factors.
Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish. A relatively small member of the carp family (which also includes the Prussian carp and the crucian carp), the goldfish is native to East Asia. It was first selectively bred in Ancient China more than a thousand years ago, and several distinct breeds have since been developed. Goldfish breeds vary greatly in size, body shape, fin configuration and colouration (various combinations of white, yellow, orange, red, brown, and black are known). Starting in ancient China, various species of carp (collectively known as Asian carp) have been bred and reared as food fish for thousands of years.
1_Apprentice
Oh very nice, I suppose they would be a good fish choice then, How big do they generally get? 
0_Wizard
Koi are pretty small, similar to goldfish.  They stand out due to their patterning and coloration.
Koi varieties are distinguished by coloration, patterning, and scalation.
chosen_Koi_0
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.
Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish. A relatively small member of the carp family (which also includes the Prussian carp and the crucian carp), the goldfish is native to East Asia. It was first selectively bred in Ancient China more than a thousand years ago, and several distinct breeds have since been developed. Goldfish breeds vary greatly in size, body shape, fin configuration and colouration (various combinations of white, yellow, orange, red, brown, and black are known). Starting in ancient China, various species of carp (collectively known as Asian carp) have been bred and reared as food fish for thousands of years.
Common goldfish
The common goldfish, also known as a feeder goldfish, is a breed of goldfish. Goldfish are a form of domesticated wild carp and are a close relative of koi. Most varieties of fancy goldfish were derived from this simple breed. Common goldfish come in a variety of colors including red, orange, yellow, white, black, and calico goldfish, with the most common variation being orange (combined with its shiny fins, hence the name). Sometimes, color may be an indication of the fish’s health status. Common goldfish are social animals who prefer living in groups. They are able to interact with any fish belonging to the same species.
Comet (goldfish)
The comet or comet-tailed goldfish is a single-tailed goldfish bred in the United States. It is similar to the common goldfish, except slightly smaller and slimmer, and is mainly distinguished by its long deeply forked tail. Comet goldfish tend to be showcased as large diverse variety of colors, unlike your common house pet goldfish. The comet-tailed goldfish breed was developed in the United States from the common goldfish by Hugo Mulertt, a government worker, in the 1880s. The comet goldfish was first seen in the ponds of the U.S. Government Fish Commission in Washington, D.C.. Mulertt later became a propagator of goldfish and an author of books on goldfish.
Multiple patterning
Multiple patterning (or multi-patterning) is a class of technologies for manufacturing integrated circuits (ICs), developed for photolithography to enhance the feature density. It is expected to be necessary for the upcoming 10 nm and 7 nm node semiconductor processes and beyond. The premise is that a single lithographic exposure may not be enough to provide sufficient resolution. Hence additional exposures would be needed, or else positioning patterns using etched feature sidewalls (using spacers) would be necessary. Although EUV has been projected to be the next-generation lithography of choice, it would still require more than one lithographic exposure, due to the foreseen need to first print a series of lines and then cut them; a single EUV exposure pattern has difficulty with line end-to-end spacing control.
Fishkeeping
Fishkeeping is a popular hobby, practiced by aquarists, concerned with keeping fish in a home aquarium or garden pond. There is also a piscicultural fishkeeping industry, as a branch of agriculture. Fish have been raised as food in pools and ponds for thousands of years. Brightly colored or tame specimens of fish in these pools have sometimes been valued as pets rather than food. Many other cultures kept fish for both functional and decorative purposes. Ancient Sumerians kept wild-caught fish in ponds, before preparing them for meals. Depictions of the sacred fish of Oxyrhynchus kept in captivity in rectangular temple pools have been found in ancient Egyptian art.
A Riot of Goldfish
A Riot of Goldfish (金魚撩乱) is a short story written by Japanese author Okamoto Kanoko in 1937. Okamoto Kanoko 岡本かの子 (1889-1939) wrote "A Riot of Goldfish" in 1937. Okamoto was a Buddhist scholar, an aesthete, and a feminist, all of which influences appear in the text. She was an active member of the feminist group Bluestockings ("seitosha"). Also common in her work is water-related imagery, sensual descriptions of female beauty, the rejection of traditional female roles, an embellished prose style, and a unique use of language. The protagonist in A Riot of Goldfish, Mataichi, attempts in vain to create the perfect goldfish.
1_Apprentice
Oh got ya, I have seen them before at our local park, there is a giant pond there, How long do they love for? 
0_Wizard
I really do not know.  I do know that they originated in East Asia back in 5th century BC.
The Amur carp ("Cyprinus rubrofuscus"), a member of the common carp ("Cyprinus carpio") species complex native to East Asia, was aquacultured as a food fish at least as long ago as the fifth century BC in China, and Jin Dynasty (fourth century AD) texts mentioned carp with various colors.
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Ancient history
Ancient history is the aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly 5,000 years, beginning with Sumerian Cuneiform script, the oldest discovered form of coherent writing from the protoliterate period around the 30th century BC. The term classical antiquity is often used to refer to history in the Old World from the beginning of recorded Greek history in 776 BC (First Olympiad). This roughly coincides with the traditional date of the founding of Rome in 753 BC, the beginning of the history of ancient Rome, and the beginning of the Archaic period in Ancient Greece.
List of ancient great powers
In an ancient context, recognized great powers came about first in Europe during the post-Napoleonic era. The formalization of the division between small powers and great powers came about with the signing of the Treaty of Chaumont in 1814. A great power is a nation or state that, through its great economic, political and military strength, is able to exert power and influence over not only its own region of the world, but beyond to others. The historical terms "Great Nation", a distinguished aggregate of people inhabiting a particular country or territory, and "Great Empire", a considerable group of states or countries under a single supreme authority, are colloquial; their use is seen in ordinary historical conversations (historical jargon).
Ancient Macedonians
The Macedonians (, "Makedónes") were an ancient tribe that lived on the alluvial plain around the rivers Haliacmon and lower Axios in the northeastern part of mainland Greece. Essentially an ancient Greek people, they gradually expanded from their homeland along the Haliacmon valley on the northern edge of the Greek world, absorbing or driving out neighbouring non-Greek tribes, primarily Thracian and Illyrian. They spoke a Hellenic language, although the "lingua franca" of the region was at first Attic Greek and then Koine Greek. Their religious beliefs mirrored those of other Greeks, following the main deities of the Greek pantheon, although the Macedonians continued Archaic burial practices that had ceased in other parts of Greece after the 6th century BC.
Palaeography
Palaeography (UK) or paleography (US; ultimately from , "palaiós", "old", and , "graphein", "to write") is the study of ancient and historical handwriting (that is to say, of the forms and processes of writing, not the textual content of documents). Included in the discipline is the practice of deciphering, reading, and dating historical manuscripts, and the cultural context of writing, including the methods with which writing and books were produced, and the history of scriptoria. The discipline is important for understanding, authenticating, and dating ancient texts. However, it cannot in general be used to pinpoint dates with high precision.
Ancient Greek art
Ancient Greek art stands out among that of other ancient cultures for its development of naturalistic but idealized depictions of the human body, in which largely nude male figures were generally the focus of innovation. The rate of stylistic development between about 750 and 300 BC was remarkable by ancient standards, and in surviving works is best seen in sculpture. There were important innovations in painting, which have to be essentially reconstructed due to the lack of original survivals of quality, other than the distinct field of painted pottery. Greek architecture, technically very simple, established a harmonious style with numerous detailed conventions that were largely adopted by Roman architecture and are still followed in some modern buildings.
Poland in Antiquity
Poland in Antiquity is characterized by peoples belonging to numerous archeological cultures living in and migrating through various parts of the territory that now constitutes Poland in an era that dates from about 400 BC to 450–500 AD. These people are identified as Slavic, Celtic, Germanic, Baltic and Thracian tribes. Other groups, difficult to identify, were most likely also present, as ethnic composition of archeological cultures is often poorly recognized. While lacking use of a written language to any appreciable degree, many of them developed relatively advanced material culture and social organization, as evidenced by the archeological record, for example judged by the presence of richly furnished, dynastic "princely" graves.
History of Buddhism
The history of Buddhism spans from the 5th century BCE to the present; which arose in the eastern part of Ancient India, in and around the ancient Kingdom of Magadha (now in Bihar, India), and is based on the teachings of Siddhārtha Gautama. This makes it one of the oldest religions practiced today. The religion evolved as it spread from the northeastern region of the Indian subcontinent through Central, East, and Southeast Asia. At one time or another, it influenced most of the Asian continent. The history of Buddhism is also characterized by the development of numerous movements, schisms, and schools, among them the Theravāda, Mahāyāna and Vajrayāna traditions, with contrasting periods of expansion and retreat.