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AQUAPEDIA / SOURCE-LINKED RESEARCH

Black Small-eye Hikari (Kojiro)

ブラックスモールアイヒカリ / 小次郎

Medaka historically documented variety / house-selectionEvidence by claimIndependent review ongoing

A Hikari body-form derivative of Oba's Pure Black Small Eye / Kurobee line, named Kojiro.

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: Black Small-eye Hikari (Kojiro); Japanese romaji: not verified; Japanese characters: ブラックスモールアイヒカリ / 小次郎. 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 1Pure Black small-eye (Kurobee) housefamilyREPORTED INPUT / STAGE 2Hikari body-form selection named KojiroFOCAL STRAINAMERICAN / ENGLISH NAMEBlack Small-eye Hikari(Kojiro)JAPANESE NAME (ROMAJI)Not verifiedJAPANESE LETTERS (日本語)ブラックスモールアイヒカリ /小次郎
Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Not a confirmed genotype or parent-fish identification.

Historic selected Hikari morphology of Pure Black stock; no original parent fish identified Source: Medaka no Yakata historical Pure Black Hikari (Kojiro) breeder archive

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View this strain’s illustrated gene tree in Discord ↗

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 016: The reviewed sources do not establish a defensible specific parent mating; the illustrated pedigree intentionally remains disconnected. Review Japanese specialist record ↗

Overview

A Hikari body-form derivative of Oba's Pure Black Small Eye / Kurobee line, named Kojiro. Documentation and incomplete source history follow.

Claim-by-claim evidence

Research findingEvidence classDirect references
Creator / house credit: Yukio Oba / 大場幸雄, Hiroshima.Source-scoped maker or explicit unknownH78 ↗ F54 ↗
The original shop credits Kojiro as the Hikari-type form of Pure Black; its naming narrative later inspired paired house names.Breeder-historical origin description; DNA not verifiedH78 ↗ F54 ↗
Dark body and minute eyes with Hikari body-form expression.Source-described visual traits, not a molecular genotypeH78 ↗ F54 ↗
This is a selected body-form branch, not a new unrelated original black-color founder and not a synonym of Orochi. Archive scope: 2001 historical group; exact line-release year unconfirmed.Documentary distinction and publication-date limitationH78 ↗ F54 ↗

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

Known research gaps

  • Exact individually authenticated parent stock, all breeding generations and any stable genotype or inheritance ratio are unknown.
  • Historic year-group inclusion does not guarantee a breeder's actual first commercial sale year or present-day retail provenance.
  • Original fish photographs and source-owned images are not republished without explicit licensing.

Related profiles and lineages

Original research sources

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