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Bloodlines and parent koi (oyagoi)

By the koi.wiki editorial team · Updated

Key facts: Oyagoi (親魚) refers to adult parent koi selected for breeding, and a koi's bloodline traces its lineage back to specific historic breeding lines associated with named breeders or farms[1][2].
In nishikigoi (錦鯉) breeding, the term oyagoi (親魚) describes the adult breeder koi used to produce offspring, typically fish older than three years[3][1]. Over more than a century of selective breeding, distinct bloodlines have emerged within major varieties such as Kohaku and Taisho Sanshoku (Sanke), each associated with a particular founding breeder or farm and a set of inherited pattern and color traits[2][1].The All Japan Nishikigoi Promotion Association maintains documentation on nishikigoi genealogy, reflecting the importance placed on traceable lineage within the Japanese koi industry[4][5].

What is oyagoi?

Oyagoi (親魚) is the term for adult breeder koi kept specifically for producing spawn[1]. According to the koi dealer Kodama Koi Farm, successful breeding typically requires one healthy female and two to three males, all older than three years[3]. Breeders select oyagoi for traits they hope to pass on, such as pattern quality, body conformation, and skin and color clarity, which are central to grading in varieties like Kohaku, Showa Sanshoku, and Sanke[6].

Kohaku bloodlines

According to Wikipedia, the Kohaku (紅白) variety dates to 1888, when a breeder named Kunizo Hiroi crossed a red-headed female koi with one of his own males whose markings resembled cherry blossoms, producing the now-extinct Gosuke bloodline from which all known Kohaku bloodlines descend, including Tomoin, Sensuke, Yagozen, and Manzo[2]. Of these, the Tomoin and Yagozen lines are described as the two remaining major Kohaku bloodlines in Japan today[2].The American Koi Judges Association glossary separately lists Sensuke and Manzo as named Kohaku bloodlines, and notes that the Yagozen lineage was developed in the 1950s[1].

Sanke bloodlines

Named lineages also exist within the Taisho Sanshoku (Sanke) variety. The AKJA glossary lists Matsunosuke, Jinbei, and Torazo as Sanke bloodlines, and describes the Sadazo lineage as having bright hi (red) markings with small sumi (black) markings that do not overlap the hi[1].

Breeders and farms

Named bloodlines are often tied to specific breeders or farms. The AKJA glossary credits Dainichi Koi Farm to Minoru Mano, described as having started breeding koi as a young man and becoming a leading breeder in Japan before his death in November 1998; the glossary states he is remembered for Kohaku, Showa, and Sanke he bred[1]. The glossary also names Isumiya as a historically noted breeder[1].According to the koi dealer Kodama Koi Farm, koi from breeders such as Dainichi, Sakai, and Momotaro are often associated with higher prices due to their lineage and reputation, though this reflects the commercial perspective of a koi dealer rather than an independent valuation standard[6].

Early ancestral types

The AKJA glossary records several historic, ancestral forms that predate the modern Kohaku. Hoo Aka, a koi with red gill plates, and Hookazuki, a black carp with red cheeks, are both described as early ancestors of the modern Kohaku[1]. Menkaburi, meaning hood, is listed as an early Kohaku with a red head, and Zukinkaburi as an early Kohaku with a red forehead[1]. These terms illustrate how pattern types that are now standardized, such as the Tancho and maruten head markings, evolved from earlier, less uniform forms[1].

Pattern terms linked to lineage

Genealogy documentation

The All Japan Nishikigoi Promotion Association (JNPA) publishes material specifically on nishikigoi genealogy as part of its educational content on the breeding of nishikigoi[4]. A related organization, Shinkokai USA, also maintains a Nishikigoi Genealogy page as part of its online resources[5]. These efforts reflect the broader emphasis within the Japanese koi community on documenting and preserving lineage information for major varieties.

Common questions

What does oyagoi mean?
Oyagoi (親魚) refers to adult breeder koi, typically fish older than three years, selected and kept specifically for producing spawn[1][3].
What are the main Kohaku bloodlines?
According to Wikipedia, all known Kohaku bloodlines descend from the now-extinct Gosuke line and include Tomoin, Sensuke, Yagozen, and Manzo, with Tomoin and Yagozen remaining the two major bloodlines in Japan today[2].
Are there named Sanke bloodlines?
Yes; the American Koi Judges Association glossary lists Matsunosuke, Jinbei, Torazo, and Sadazo as Sanke lineages[1].
Who was Minoru Mano?
Minoru Mano founded Dainichi Koi Farm, started breeding koi as a young man, and became regarded as a top breeder in Japan before his death in November 1998, according to the American Koi Judges Association glossary[1].
Does bloodline affect the price of a koi?
According to the koi dealer Kodama Koi Farm, lineage and breeder reputation are factors that can affect pricing, with koi from well-known breeders often commanding higher prices[6].

References

  1. ^ Glossary – American Koi Judges Association (AKJA). American Koi Judges Association. akjajudges.com/glossary/. Retrieved November 2026.
  2. ^ Kōhaku (fish) (Wikipedia). Wikipedia. en.wikipedia.org/wiki/Kohaku_(fish). Retrieved November 2026.
  3. ^ How to Breed Koi. Kodama Koi Farm (koi dealer). kodamakoifarm.com/how-to-breed-koi/. Retrieved November 2026.
  4. ^ Nishikigoi Genealogy - All Japan Nishikigoi Promotion Association. All Japan Nishikigoi Promotion Association. jnpa.info/en/nishikigoi/genealogy/. Retrieved November 2026.
  5. ^ Nishikigoi Genealogy - Shinkokai USA Official Website. Shinkokai USA (JNPA). shinkokaiusa.com/nishikigoi-genealogy. Retrieved November 2026.
  6. ^ All About Gosanke Koi Fish Varieties "The Big Three!". Kodama Koi Farm (koi dealer). kodamakoifarm.com/gosanke-koi-fish/. Retrieved November 2026.
  7. ^ Kohaku - Koi for Sale and History - Kodama Koi Farm. Kodama Koi Farm (koi dealer). kodamakoifarm.com/variety/kohaku/. Retrieved November 2026.