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AQUAPEDIA / SOURCE-LINKED RESEARCH

Sky Blue Hikari (Shizuka)

スカイブルーヒカリメダカ / 静香

Historical Medaka named variety or selected lineEvidence by claimIndependent review ongoing

A sky-blue Hikari body-form selection in which pale pearly blue rather than grayish-blue body appearance was pursued across 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: Sky Blue Hikari (Shizuka); Japanese romaji: not verified; Japanese characters: スカイブルーヒカリメダカ / 静香. 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 1Pearl Blue/Blue Medaka family: palefemale-associated sky-blue colorselected into malesFOCAL STRAINAMERICAN / ENGLISH NAMESky Blue Hikari (Shizuka)JAPANESE NAME (ROMAJI)Not verifiedJAPANESE LETTERS (日本語)スカイブルーヒカリメダカ /静香
Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Not a confirmed genotype or parent-fish identification.

Sky Blue Hikari (Shizuka) shares 2004 Oba Pearl Blue selection history; exact Hikari body-form introduction, individual mother/father fish, F generations and DNA alleles not published. Source: Medaka no Yakata original breed-history record (Shizuka, 2004)

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View this strain’s illustrated gene tree in Discord ↗

Lineage review · Batch 20: The reviewed records do not establish a defensible breeding cross; picture ancestry remains disconnected. Original specialist source ↗

Overview

A sky-blue Hikari body-form selection in which pale pearly blue rather than grayish-blue body appearance was pursued across sexes. Distinct archive breeder credit and source-scoped provenance are documented below.

Claim-by-claim evidence

Research findingEvidence classDirect references
The historic catalog credits Yukio Oba / 大場幸雄 (Hiroshima); Selected pale-blue Hikari development.Breeder attributed in original Japanese specialist catalogueH78 ↗
The catalog describes sex-related differences in earlier Blue Medaka body colors and the breeder's selection of a pearl-blue appearance in both males and females.Reported historical breeder description; full parent log not providedH78 ↗
Pale, pearlescent blue body color with Hikari-body-form traits; the historic claim concerns appearance across sexes.Observable ornamental traits only, not genetic diagnosisH78 ↗
The breeder observation cannot establish chromosome-level color inheritance or the exact selection-generation count. Date reference: Catalog year 2004.Recorded naming and chronological limits; no DNA or current stock proofH78 ↗

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

Known research gaps

  • Date-group placement is source-reported and not proof of verified first sale or all original breeder generations.
  • Incomplete founder stock identities, absence of independently verified molecular genetics and uncertain current-shop stock authenticity.
  • Original historical photograph copyrights not cleared; external source photographs are not redistributed.

Related profiles and lineages

Original research sources

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