Picture gene & lineage tree
Visual pedigree of breeder-reported inputs, where available. Dashed arrows represent documentary claims or selection history, not DNA-tested genes.
This strain's direct parent lines are not established by the reviewed sources. No breeding cross, genotype or inheritance pattern is implied. Source: Sources remain under review; ancestry connections will appear only with cited evidence.
Identification and origin
SNR Medaka USA maintains a dedicated Yoru (Night) variety card, reference STR-000096. It labels the source TOA, records Japanese origin, lists the fish in its collection since 2026, and shows an import in September 2026 (TOA). Its linked 2026 import-event listing calls the item Yoru (Night) — Mimu Medaka new release / 夜（美夢めだか新作）.
Important attribution boundary: SNR explicitly says that its “Original breeder” field names the breeder from whom it imported the fish, and is not necessarily the creator. “Mimu Medaka new release” is the seller's commercial description, not independently verified proof of original creation, exact release date or breeding parentage. TOA is a documented supplier in this shipment; do not attribute authorship to TOA without primary creator evidence.
Name disambiguation: Yoru, Yoru Kuro and Yozakura
The house name 夜 (Yoru) is not demonstrated to be the same genetic line as 夜黒 (Yoru Kuro, a black/lame-associated selected line) or 夜桜 (Yozakura, Night Sakura). Japanese fish publisher PCS (ピーシーズ) described Yoru Kuro (夜黒) in May 2022 as selected offspring of Yozakura × Black Lame Yellow Miyuki external-light stock maintained by Muchu Medaka (夢中めだか). That historical family is separate documented context; do not import that 2019–2022 reported pedigree into the different 2026 Yo
Appearance, diagnostic traits and grades
SNR provides multiple real specimen images and videos of its 2026 shipment, and explicitly notes that the imported/kept fish photographed are not necessarily ideal grading-standard individuals. Color can vary substantially with tub background and lighting. No primary breeder-published diagnostic trait list, grade thresholds or stabilized phenotype percentages were verified for this newly listed Yoru offering. Evaluate adult specimens with owner-permitted, provenance-labeled t
No SNR photographs or videos are embedded, downloaded or reproduced in this dossier: the importer explicitly prohibits copying and reposting without permission.
Genetics and lineage picture
Parent lines not documented. Neither the importer card nor the event listing establishes a specific foundation cross for Yoru (夜). The illustrated pedigree is deliberately unknown—no named parent arrows, assigned genotypes, Mendelian dominance/recessiveness, allele names or fixation percentages are inferred. In particular, historical Yoru Kuro parent lines are not substituted for Yoru's undocumented lineage.
A creator statement in Japanese, original-generation records, and verifiable breeder-provenance photographs would be needed to revise this picture.
Care, breeding and compatibility
Use evidence-based Oryzias latipes husbandry rather than inventing special Yoru requirements: stable dechlorinated freshwater, appropriate oxygenation/filtration, monitored water quality, cover and acclimation, developmentally suitable omnivorous medaka foods, and quarantine of newly acquired fish. Maintain documented parent identifiers, generation notes, hatch dates, size-class separation and color observations. No credible Yoru-specific optimum water parameters, treatment d
Authenticating a specimen
Keep the original 2026 import invoice or source listing, breeder/source name, acquisition date, specimen photographs and descendants' generation records together. The name alone and an apparent dark or luminous phenotype are insufficient to prove a particular creator or pedigree. Do not label ordinary Yozakura or Yoru Kuro stock as Yoru on visual similarity alone.
Sources, attribution confidence and open research
Editorial note: This is an evidence-stage trade-name dossier, not a creator-certified pedigree, formal strain registration or endorsement. Source URLs are for verification; no protected images or translated full articles have been republished.
Public research references
Listed research leads are not automatically supporting evidence for every individual claim.