Chagoi

Looks how to spot one

Scales

Chagoi have a sturdy, deep-bodied carp shape with large, neat scales covering the whole body. They are non-metallic, meaning their skin has a soft, matte finish rather than a shiny or metallic sheen. Their fins are typically rounded and match the body colour.65

Personality what they are like

Chagoi are famously gentle and sociable. They often swim up to greet people, happily accept touching, and are usually the first to come to the surface at feeding time. Their calm nature can help shy or nervous koi in the same pond become more confident and interactive.61

Daily activity how busy a day looks

Chagoi are moderately active and need plenty of room to swim, forage, and interact. A spacious pond with at least 250 gallons per adult fish is recommended, with a depth of 3 to 6 feet to help with temperature stability and winter safety.3

Grooming and care the hands-on bits

Chagoi require clean, well-filtered water with stable conditions. Regular water testing and maintenance are essential. They do not need structured grooming, but their pond should have strong aeration and reliable filtration to support their size and activity.3

Home where they are happiest

Koi prefer slow-moving freshwater with some depth, around 2 metres (6.6 feet) or more. They tolerate a range of turbidity and flow, but a deep, well-filtered pond is best. In some regions, koi are considered invasive and may be regulated or illegal to keep outdoors; check local laws before acquiring one.78

Food basics what goes in the bowl

Chagoi are omnivorous bottom-feeders. In the wild they eat benthic organisms, detritus, arthropods, larvae, and weeds. As pets, they do well on a complete commercial koi pellet suited to their life stage and water temperature. Offer leafy greens or peas as occasional treats, but avoid overfeeding, especially in cooler months.73

Company who they like around

Koi are social fish and do best in a small group rather than alone. Chagoi are especially friendly and can help calm other koi. They are not venomous or aggressive, but they need enough space and compatible tankmates to thrive.36

The story where it all began

Chagoi are a colour variety of the koi, which is a domesticated form of the Amur carp (Cyprinus rubrofuscus). They were first bred in Japan during the Taisho Era (1912-1926). Unlike many other koi varieties that were developed for specific colours or patterns, Chagoi came about almost by accident. Farmers selectively bred common carp for traits that made them better as food, such as large size and a tame, friendly nature. Over a few generations, the fish became noticeably bigger and more docile, and their colour shifted to a brownish tea tone. They were then recognised as a distinct variety and kept as pets rather than food. The name 'Chagoi' comes from 'cha', meaning tea or brown, and 'goi', meaning carp. Today they are loved for their gentle personality and impressive size.12

Recognised by the official bits

Koi keeping community

Recognised as a non-metallic, single-colour variety of koi, prized for its friendly temperament and large size.6