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Word(Pronunciation) Meaning
Obachi(oh bah' chee)
Tail section. A specific term for Ozutsu. It specifies the top section of the Ozutsu, not the sides or the bottom. The tail section is a very important part for Koi, and thus, there are many special terms.

Obi Zumi
(oh bee' zoo' mee)

Belt Sumi. A shape of Sumi that is thin, long and square like an Obi (belt). Several Sumi patches usually connect to create the pattern. Used mainly to describe the Sumi in Taisho Sanshoku (Sanke). The pattern must cross the backbone and look like an Obi. It would be perpendicular to Tate Zumi.
Ochibashigure
(oh' chee bah she goo reh')
Gray markings on either a brown , yellow or green koi.
Odome(oh doe' meh) Line between the last color and Shiroji in the tail section. Odome is the way the pattern appears as it stops or finishes in the tail section. A good Odome must create a clear line and leave white showing. The pattern in the tail section must consist of both Hi and Shiroji in Kohaku, and Hi, Shiroji and Sumi for both Taisho Sanshoku (Sanke) and Showa. When the tail section ends with adequate Shiroji before the fin (especially in Gosanke), we say that the "Odome is good." When the Shiroji is too wide or when only Hi or Sumi reach the tail, we say that the "Odome is bad."
Odome Hi
(oh doe' meh he')
Red pattern on the tail section.
Odome Zumi
(oh doe' meh zoo' me)
Sumi on the tail section.
Ogon(oh' gone) Means the variety of metallic-gold scaled Koi (yamabuki ogon).
Oh Zumi(oh' zoo' mee) Relatively large Sumi on the body. Also called Doka Zumi.
Ojiya City(oh gee' yah) The birthplace in Niigata of Nishikigoi.
Okute(oh coo' the) Late bloomer.
Oni Uroko
(oh ni' oo row koh)
The large, dark-blue scales running down the back of Shusui.
Otomo(oh tow' mow) Companion. Often used to describe free Nishikigoi that are included along with the purchase of an excellent quality Nishikigoi.
Oyabone
(oh yah' bow neh)
The tickest bone of the pectoral fin, dorsal fin and tail fin. The bone of each fin that is closest to the head. Ideally, it should be white. When it has some color, we say that the "Oyabone is disgraced."
Ozuke Hi
(oh' zoo keh hee)
Hi at the very base of the tail fin. Not desirable.
Ozutsu(oh zoi t-sue) Tail section. This term is used for the part of the body located from the end of the dorsal fin to the root of the tail. It is an important section because it contains the Odome. In addition, Nishikigoi with thick Ozutsu look powerful; while Koi with thin Ozutsu look feeble. If a Koi has a thick Ozutsu while it is young, it may have the potential to grow in to a Jumbo Koi. Obachi specifies the top section of the Ozutsu, not the sides or the bottom.

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