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AQUAPEDIA / SOURCE-LINKED RESEARCH

Dorsalfinless Blue Miyuki / Ryusei

青幹之背ビレ無し / 流星

Historical Medaka research entryEvidence by claimIndependent review ongoing

Nakazato's 2013 Ryusei selection emphasizes dorsalfinless Blue Miyuki, allowing uninterrupted dorsal exterior-light expression.

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: Dorsalfinless Blue Miyuki / Ryusei; Japanese romaji: not verified; Japanese characters: 青幹之背ビレ無し / 流星. 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 1Yellow-bodied Dorsalfinless Medakastock (Nakazato)REPORTED INPUT / STAGE 2Miyuki Medaka, blue-bodyexterior-light stockREPORTED INPUT / STAGE 3Crossing and subsequent selection fordorsalfinless continuous exterior lightFOCAL STRAINAMERICAN / ENGLISH NAMEDorsalfinless Blue Miyuki /RyuseiJAPANESE NAME (ROMAJI)Not verifiedJAPANESE LETTERS (日本語)青幹之背ビレ無し / 流星
Dashed connectors show breeder-reported input or selection history; they do not prove genetic parentage. Not a confirmed genotype or parent-fish identification.

Original account explicitly identifies a yellow dorsalfinless × Miyuki breeding cross; exact male/female founder identities, subsequent F numbers, segregation and DNA unreported. Source: Medaka no Yakata original Ryusei breeding origin account, Yoshinori Nakazato

Browse the larger Medaka lineage atlas ↗

View this strain’s illustrated gene tree in Discord ↗

Lineage review · Batch 032: Original account explicitly identifies a yellow dorsalfinless × Miyuki breeding cross; exact male/female founder identities, subsequent F numbers, segregation and DNA unreported. Original breeder cross account ↗

Lineage review · Batch 017: The review has not established a defensible original breeding pair. The picture ancestry node remains deliberately disconnected. Specialist source ↗

Overview

The dorsal fin interrupts the reflective dorsal strip on a conventional Miyuki. The recorded dorsalfinless selected body form permits a more continuous visible line. Historical creator/source attribution: Yoshinori Nakazato / 中里良則.

Claim-by-claim evidence

Research findingEvidence classDirect references
Medaka no Yakata attributes the 2013 Dorsalfinless Blue Miyuki entry to 中里良則 (Kanagawa)Historical maker recordH89 ↗
The nickname Ryusei / 流星 refers to the continuous line-like shine over the backDocumented nickname interpretationH89 ↗
Absence of the dorsal fin and uninterrupted Miyuki exterior light are defining appearance traitsPhenotype recorded in catalogH89 ↗
The catalog does not detail exact named parents or complete generation countsPedigree remains unverifiedH89 ↗

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

Known research gaps

  • Dorsalfinless is a morphology trait, not a proof of a single source allele here.
  • Do not merge original Ryusei with every modern independently crossed dorsalfinless Miyuki descendant.
  • DNA-verified ancestry, independent inheritance ratios and authenticated present-day stock provenance require further source review.
  • No third-party photographs are rehosted without documented permission.

Related profiles and lineages

Original research sources

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