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AQUAPEDIA / SOURCE-LINKED RESEARCH

Utsubuki Black Lame Yellow Miyuki F4 Cross

黒ラメ黄幹之F4♀×改良メダカ♂

Breeder-described Medaka line or in-development selectionEvidence by claimIndependent review ongoing

Utsubuki crossed a female F4 Black Lame Yellow Miyuki house line with a gifted improved-Medaka male of unknown exact variety.

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: Utsubuki Black Lame Yellow Miyuki F4 Cross; Japanese romaji: not verified; Japanese characters: 黒ラメ黄幹之F4♀×改良メダカ♂. 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 1JOURAKUAN Black Lame Yellow Miyuki F4femaleREPORTED INPUT / STAGE 2Gifted male (pedigree unknown)REPORTED INPUT / STAGE 3Later selection for deeper pigment andlightFOCAL STRAINAMERICAN / ENGLISH NAMEUtsubuki Black Lame YellowMiyuki F4 CrossJAPANESE NAME (ROMAJI)Not verifiedJAPANESE LETTERS (日本語)黒ラメ黄幹之F4♀×改良メダカ♂
Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Not a confirmed genotype or parent-fish identification.

Gifted male strain unresolved: do not invent its identity Source: Utsubuki first-person F4 house-cross description

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View this strain’s illustrated gene tree in Discord ↗

Lineage review · Batch 21: Historical source describes the breeding stock or selected form shown by dashed connections. This does not establish individual parentage, genotype, or dominance. Original specialist source ↗

Overview

Utsubuki crossed a female F4 Black Lame Yellow Miyuki house line with a gifted improved-Medaka male of unknown exact variety. This account distinguishes original founder varieties, named selected variants, and unfinished breeder projects.

Claim-by-claim evidence

Research findingEvidence classDirect references
Developer role: Utsubuki Medaka / うつぶきメダカ — Breeder-submitted unnamed experimental house cross.Breeder-submitted role, separate from original source-stock creatorsJMU ↗
The breeder reports raising a JOURAKUAN Black Lame Yellow Miyuki family to F4, crossing a female with a gifted male, and still selecting for deeper body color and pale blue exterior light.First-person breeding/selection account; publication and sale chronology not independently completeJMU ↗
Variable body pigmentation and exterior-light coverage, with no declared stable standard yet.Observed or intended visual selection; not a genetic trait testJMU ↗
The gifted male's original variety, full pedigree and any final cultivar name remain UNKNOWN; do not imply JOURAKUAN created the derivative.Lineage ambiguity or experimental development constraintJMU ↗

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

Known research gaps

  • Fish-specific parent identifiers, stock provenance, and any complete breeding generation log are not independently verified.
  • DNA causation, segregation ratios, phenotype stability across breeders and first commercial sale year are unverified.
  • Third-party fish photos cannot be reused without creator or rights-holder permission.

Related profiles and lineages

Original research sources

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