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AQUAPEDIA / SOURCE-LINKED RESEARCH

Pure White (Yukikomachi)

ピュアホワイト / 雪小町

Historical Medaka research identityEvidence by claimIndependent review ongoing

Oba's 2003 Pure White line selected white 'Milky' body color expressed in both sexes.

Picture gene & lineage tree

Visual pedigree of breeder-reported inputs, where available. Dashed arrows represent documentary claims or selection history, not DNA-tested genes.

Horizontal branching Medaka lineage. American name: Pure White (Yukikomachi); Japanese romaji: not verified; Japanese characters: ピュアホワイト / 雪小町. Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Documented source links and evidence qualifiers follow the diagram.AQUAPEDIA / MEDAKA LINEAGE ATLASSTRAIN PEDIGREEREPORTED LINEAGEDASHED BRANCHES • REPORTED INPUTS / SELECTION STAGESNot an individual-fish pedigree or DNA / dominance test.REPORTED INPUT / STAGE 1White Medaka base populationREPORTED INPUT / STAGE 2Rare all-white male and subsequentcolor-selection generationsFOCAL STRAINAMERICAN / ENGLISH NAMEPure White (Yukikomachi)JAPANESE NAME (ROMAJI)Not verifiedJAPANESE LETTERS (日本語)ピュアホワイト / 雪小町
Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Not a confirmed genotype or parent-fish identification.

Original observation and multi-generation fixation description; no DNA test or authenticated parental specimens Source: Medaka no Yakata original Oba Pure White Yukikomachi breeding history

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Lineage review · Batch 024: Breeder or specialist records establish the pictured historical population, selected form or source stock. Dashed arrows do not imply DNA-confirmed parents or dominance. Original breeder/specialist source ↗

Lineage review · Batch 19: At this earlier review, no defensible original breeding cross was established. A later Batch 024 review documented source-stock or selection history; see that updated note above. Individual founder parentage remains unverified. Original specialist source ↗

Overview

Oba's 2003 Pure White line selected white 'Milky' body color expressed in both sexes. The farm reports finding a rare pure-white male among white Medaka and selectively breeding for the same white body coloration in males and females. Creator-versus-discoverer status is source-scoped.

Claim-by-claim evidence

Research findingEvidence classDirect references
Historical record: Yukio Oba / 大場幸雄 — Created at Medaka no Yakata, according to farm.Archive maker or discoverer attributionE78 ↗
The farm reports finding a rare pure-white male among white Medaka and selectively breeding for the same white body coloration in males and females.Source-described historical breeding and development, not independently genotypedE78 ↗
Uniform milky-white body appearance is preferred rather than the creamier, yellow-tinged 'Silky' selection.Visual phenotype only; individual expression can varyE78 ↗
The breeder's greater-than-99-percent expression statement is a house report, not an independently measured breeding trial. Historical context: 2003.Editorial distinction grounded in cited source; exact sale dates not guaranteedE78 ↗

Evidence labels refer to documentary strength. They do not assert independently tested genetics.

Known research gaps

  • The rare founding male and generation records cannot be authenticated from public documents.
  • Cited first-generation and selected-parent statements do not prove DNA genotype, inheritance rate or present-day breeder-stock identity.
  • No third-party breeder/catalogue image is reproduced; photo rights and original genetic records require independent review.

Related profiles and lineages

Original research sources

Every row above links directly to its cited reference; publication or creation years are not interchangeable.