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1. First, the koi cannot be missing anything like a fin or have any abnormalities like a pushed in mouth all of which will disqualify the koi from judging. The exception is the second set of barbels.
2. Second the koi must be healthy and not show signs of disease or parasites, which could disqualify the koi from judging. An exception is made for split fins or bruises judged to be caused during transportation.
3. Third, is the importance of body conformation. Broad, thick body shape of female koi is preferred giving an imposing appearance when compared to the thin trout shaped body of a male koi. Shape and size of the fins are important to be in proportion to the body. The head shape is important that it not be too short or too long or turn to one side. The koi when viewed from above should be symmetrical on both sides and not have one side flatter than the other. Even the way a koi swims is taken into account on conformation. Not all female koi hold their eggs well, which could affect conformation.
4. Fourth, in my opinion is quality of skin and deep, vibrant colors, which makes koi “living jewels”. This also includes how well the koi is “finished”, are all of the colors up, and is there a good sheen on the skin. It is conformation and quality that will catch a Judges eye from a distance.
5. Fifth is pattern that is artistically balanced and not front, tail or side heavy. Pattern must also be proportional to the size of the koi and not have a small pattern on a huge body or a huge pattern on a small body.
6. Last is uniqueness or character usually of the pattern on the head that makes this koi special.