Picture gene & lineage tree
Visual pedigree of breeder-reported inputs, where available. Dashed arrows represent documentary claims or selection history, not DNA-tested genes.
Specialist explicitly describes Wakasagi as derived from Seiryu Kiryu; not a fish-species cross Source: Medaka WEB Zukan No.0902 (Oba Wakasagi selection history)
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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 21: 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
A 2020 Oba blue exterior-light house derivative selected for internal-black appearance and lateral reflection. The evidence below is based on a documented specialist variety entry, not independently verified laboratory genetics.
Claim-by-claim evidence
| Research finding | Evidence class | Direct references |
|---|---|---|
| The specialist variety catalogue identifies Yukio Oba / 大場幸雄 as the original maker for the 2020 record. | Documented specialty-catalogue attribution, not independently authenticated creator correspondence | W902 ↗ |
| Blue-toned external reflection alongside visually distinct internal black tissue pigmentation. | Source-defined phenotype and classification, not DNA genotype | W902 ↗ |
| The source says this derived from the Seiryu Kiryu exterior-light stock and was named after its superficial resemblance to another freshwater fish. | Specialist historical selection summary; precise broodstock not verified | W902 ↗ |
| A resemblance-based nickname is not evidence of species mixing; this remains a selected Medaka line. | Differentiation from another historical name or pedigree limitation | W902 ↗ |
Evidence labels refer to documentary strength. They do not assert independently tested genetics.
Known research gaps
- No independently inspected original breeder register, genotype assay or complete individual parent-fish mating ledger is available.
- Source attribution and the historical year should not be interpreted as confirmed first retail sale date or authentication of present-day fish.
- External catalogue images are not republished without separately verified copyright/reuse permission.
Related profiles and lineages
Original research sources
Every row above links directly to its cited reference; publication or creation years are not interchangeable.
- W902: Medaka WEB Zukan No.0902: Wakasagi — 2020 Oba internal-black derivative