Tategoi: The Art and Skill Behind Koi Selection
- Kevin Warren
- 11 minutes ago
- 7 min read
Marushin Koi Farm Owner/Breeder, Mitsuhiro Tanaka, selecting tategoi from his tosai out of mud ponds. Photo Kevin Warren
How breeders assess developing Nishikigoi and what enthusiasts can learn from the decisions to keep, raise and reassess them.
Among a breeder’s young koi, the fish that attracts immediate attention is not necessarily the one with the greatest promise. The more difficult judgment concerns what is still developing: whether the body, skin and coloration justify further years of care. That distinction lies at the heart of Tategoi selection.
For enthusiasts, understanding the art and skill behind koi selection, or tategoi begins with looking beyond the markings that first catch the eye. For breeders, it means deciding which koi deserve more time—and accepting that the outcome remains uncertain.
What Tategoi Really Means
Tategoi (立て鯉) describes a koi being raised for its potential to improve. It is not a variety, an age category or a guarantee of championship quality. The term concerns development: qualities that are present but have not yet reached their best expression.
Breeders commonly retain such koi for further development, but it is incorrect to say that tategoi are never sold. Sakai Fish Farm, for example, has offered koi through its Super Tategoi Cup auction. A sale changes ownership; it does not necessarily mean that a koi has finished developing.
Nor is the term restricted to tosai, koi in their first year. The decision to continue raising a fish can extend beyond its first growing season.
The expected outcome also matters. Not every tategoi is being raised to become an exceptionally large koi. Some may achieve their best quality at a more modest size. Sakai Fish Farm’s explanation of the term makes this distinction while acknowledging that promising koi do not always develop as expected. Tategoi is a judgment about a fish’s future, not a fixed destination shared by every koi carrying the description.
From Parent Koi to Repeated Selection
The work begins with oyagoi, the parent koi. Breeders consider lineage, coloration and body conformation when choosing a pairing. These decisions establish the starting material from which subsequent selections will be made.
Pedigree alone, however, is not the whole calculation. In an interview published by Hikari, Kentaro Sakai emphasizes the importance of the combination of parental bloodlines in producing the desired qualities in their offspring.
After spawning and hatching, selection becomes a continuing part of husbandry. Breeders examine the offspring, retain those that meet their objectives and reduce the numbers being raised. This also gives the selected koi more growing space and reduces competition for food. Cuttlebrook Koi Farm in the United Kingdom has described successive harvests and assessments rather than a single decisive selection.
The criteria are not identical for every variety. In early Showa selection, for example, breeders retain black fry, known as kuroko. At that stage, selection is not an attempt to judge the finished arrangement of red, white and black that a mature Showa will display.
As the koi develop, assessment becomes more detailed. Body shape, skin quality, coloration, pattern and the relationship between these features receive continuing attention. A fish may be retained at one selection and offered for sale at a later one; sale does not necessarily mean that further improvement is impossible.
There is no final certification of tategoi status at the end of the first year. Japan’s Ministry of Agriculture, Forestry and Fisheries describes selection as a repeated process extending from fry into older koi, with some fish raised for shows and others eventually used as parents. These are different purposes: a promising developing koi does not automatically become oyagoi.
Reading the Qualities That Matter
Tategoi selection is not a checklist in which one outstanding feature cancels every weakness. The useful question is how the fish’s qualities work together—and whether there is a sound basis for expecting them to improve.
Body Conformation
Look at the whole frame rather than size alone. Zen Nippon Airinkai’s (ZNA) terminology distinguishes skeletal strength, body depth and overall conformation. It also identifies the ozutsu, the rear section of the body leading toward the tail, as important when assessing future body development.
For the enthusiast, this means examining the proportions from head to tail, not simply choosing the widest or heaviest-looking youngster. A broad back or substantial tail tube is useful evidence to consider, but neither should be treated as a promise of exceptional adult size.
Skin Quality
Skin quality concerns more than the brightness of a photograph. ZNA uses teri to describe the skin’s luster and associates it with good condition and finish. On koi with a white ground, that skin also provides the setting against which the colored markings are appreciated.
The practical lesson is to examine the fish itself whenever possible. Do not assume that an attractive pattern proves good skin, or that the absence of a tategoi label means a koi has poor skin.
Red Pigment and Pattern Edges
The assessment of hi, the red markings, involves their quality and consistency, not simply how dark the red appears. ZNA distinguishes the red pattern areas, or hi plates, from problems such as uneven coloration and gaps in pigment between scales.
Pattern edges also need to be understood correctly. Sashi is the softer leading edge where white scales overlap colored scales beneath them. Kiwa describes the trailing boundary of a marking. An orderly sashi should not automatically be mistaken for bleeding color or failing pigment. The two edges have different structures and should not be judged as though they were identical.
Black Pigment
With sumi, or black pigment, the distinction between developing and finished color is important. ZNA differentiates thick, lustrous black from shadowy pigment visible beneath the skin. It also notes that black lying over red can appear darker because of the underlying color.
A small amount of visible sumi therefore requires careful interpretation rather than immediate dismissal. Equally, a shadow beneath the skin is not a promise that a perfectly placed black marking will eventually appear. Ask what supports the breeder’s expectation, rather than filling in the missing pattern through wishful thinking.
Pattern in Relation to the Fish
Pattern remains part of the assessment, but it belongs alongside body shape, skin quality and long-term potential. Repeated selection specifically considers these qualities together, rather than treating an attractive arrangement of markings as sufficient on its own.
For a collector, the distinction is useful. Appreciating the pattern a koi has today and evaluating the fish it may become are related tasks, but they are not the same task.
The Environment Behind Development
Outdoor mud ponds, known as noike, are an established part of koi raising. They provide growing space and, particularly for young fry, natural food. They also require careful preparation and management; an earthen pond is not automatically a suitable growing environment simply because it contains mud and water.
Mud ponds are not the only route to successful development. In a RINKO magazine interview, Nishikigoi Niigata Direct described raising a Kohaku in concrete ponds that subsequently won the Nagaoka City Koi Show. Its account emphasized close observation, controlled stocking and adjustments to feeding during seasonal heat.
That example offers a more useful lesson than attributing quality to a particular pond type or regional water alone. The environment must be managed around the fish. The breeder’s work continues after selection, through the daily decisions that allow a promising koi to develop.
When Even Experienced Breeders Are Surprised
The Art and Skill Behind Koi Selection
The uncertainty of selection is not merely a beginner’s problem.
Discussing the Kohaku S Legend after its 2017 All Japan Combined Nishikigoi Show Grand Champion win, Kentaro Sakai recalled that he had not initially anticipated its eventual quality. When the koi was younger, its color was light and its head appeared large in relation to its slender body. Its development during the following year changed his assessment.
The lesson is not that selection is guesswork. It is that an informed judgment remains a judgment. Experience can improve the questions a breeder asks.
What Enthusiasts and Collectors Can Learn
When considering a koi described as Tategoi, ask for the reasoning behind the description. Which qualities does the breeder expect to improve? What is already established, and what remains uncertain? Is the expectation based on the individual fish, previous offspring from the same pairing, or experience?
These questions are more useful than the label alone.
Choose a koi you can appreciate while it develops, rather than one whose entire appeal depends on a hoped-for transformation. Missing color should not become an excuse to imagine any pattern you please, and a respected pedigree should not replace an examination of the fish in front of you.
Keep dated photographs under reasonably consistent conditions, along with notes on growth and visible changes. Use these records to compare your original expectations with what actually happens. Over time, they can become a practical record of your own observations.
Most importantly, allow appreciation to remain broader than ambition. A koi need not become an enormous show winner to justify the care given to it.
The value of understanding Tategoi is not simply learning which fish to buy. It is learning to look more carefully, ask better questions and recognize the work behind a breeder’s decision to keep a koi for another season.
Take your next step and Deepen your tategoi journey
The journey of understanding tategoi does not stop here. It is the beginning of a deeper appreciation for the craft behind every exceptional Nishikigoi.
Koi Waters invites you to continue exploring the world of Japanese koi breeding through the stories, farms, and living jewels that define this ancient art. Explore koi pond designs that give tategoi the environment they deserve to develop and be appreciated. And for ongoing stories, photography, and cultural insight from Japan, the full archive of Koi Waters magazine is always here, flowing gently forward with each new season.
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