Koi names describe more than a palette. Color arrangement, skin sheen, and scale type all help identify the fish. This guide explains the familiar groups and the distinctions that are easy to miss in photographs.
Kohaku: Red on White
Kohaku have a white ground with red markings. Red is often described as hi or beni; the white ground is shiroji. Notice the body and skin as well as how the red plates are arranged. Neither a fixed number of steps nor a compulsory symbolic meaning defines every good Kohaku.
Taisho Sanke: Red, White, and Black
Sanke combine white and red with black markings, called sumi. The black usually reads as separate accents rather than the wrapping organization familiar in Showa. Do not turn a general identification cue into an absolute rule that one unexpected black area settles every classification.
Showa Sanshoku: A Different Three-Color Arrangement
Showa also combine red, white, and black. Black often involves the head and extends around the body, helping distinguish them from Sanke. Modern examples vary in how much white they show. Compare the organization of the pattern rather than simply choosing whichever fish has more black.
Utsurimono and Bekko
GroupUseful descriptionExamplesUtsurimonoBlack-based contrast with one other main colorShiro Utsuri, Hi Utsuri, Ki UtsuriBekkoWhite, red, or yellow with black markingsShiro Bekko, Aka Bekko, Ki BekkoThe two groups can be confused when viewed only from above or in a cropped photograph. Look for how the black is organized and consult a variety profile when the fish is ambiguous.
Ogon: Single-Color Metallic Koi
Ogon have metallic skin and a single main color. Yamabuki Ogon are yellow, Platinum Ogon are white, and Orenji Ogon are orange. The metallic quality matters: a non-metallic yellow Kigoi is not a Yamabuki Ogon merely because it looks golden in bright light.
Asagi and Shusui
Asagi are recognized by blue-gray reticulated scaling on the back and red-orange areas lower on the body and fins. Shusui are related reduced-scale koi with prominent larger scales along the dorsal region. Their appearance needs to be read as a whole; 'blue fish' is only a broad visual starting point.
Goshiki and More Complex Names
Goshiki means five colors, but that is not a requirement to count five obvious separate patches on every fish. The group is known for a complex darker ground with red patterning, and appearance can develop. Goshiki should not automatically be described as a metallic mosaic. Other names need their own profiles rather than an improvised color formula.
Doitsu, Ginrin, and Metallic Are Different Axes
Doitsu describes reduced scaling, including forms with conspicuous rows of large scales. Ginrin describes reflective scales. Metallic refers to the skin sheen. These descriptors can combine with variety names and should not be treated as interchangeable alternatives to them.
Learn from Comparable Views
Use representative light, full-body views, and swimming video where available. The ZNA variety profiles give more detailed examples. For related questions, see Japanese terminology, color vocabulary, scale features, and judging criteria. Identification is a way to understand the fish, not a substitute for checking health or care requirements.