Identity and naming
Preferred search name: Goshiki Shikkoku. Japanese name/label: 五式漆黒 (trade-channel wording). Confirm breeder-designated writing, pronunciation, and distinct-line status before public catalog promotion.
Quick facts and husbandry
Freshwater ornamental medaka. No strain-specific controlled water-parameter optimum was found in the reviewed references. General O. latipes husbandry applies; avoid claiming a bespoke temperature/pH target without studies or primary keeper records. Stable conditioned water, temperature consistency, appropriate oxygenation, cover, biosecurity and quarantine are prudent husbandry practices.
Appearance and diagnostic phenotype
Base Goshiki descriptions emphasize black body and orange/red fins, with reduced background-color response; exact Shikkoku variant trait standard unverified.
Grade criteria: Inspect multiple top- and side-view images of identified breeder stock under consistent light; evaluate the claimed defining expression separately from individual quality. No validated numeric grade threshold was located.
Genetics and reported lineage
Documented/reported cross: Historical Aquaphoria line labeled Goshiki/Shikkoku, possibly a darker selected Goshiki expression; precise breeding history not established.
Evidence interpretation: Do not conflate Goshiki Type R, Type B, Shikkoku and GOD variants without breeder records.
Do not infer dominant/recessive loci, trait percentages, guaranteed fry phenotypes or genetic fixation from this pedigree alone. Keep records of each actual parental pair and offspring generation.
Creator, lineage and history
Goshiki base traits documented by Medaka no Yakata; creator of the specifically named Shikkoku line not authenticated.
Precise release year and original breeder distribution should remain unverified unless supported in the evidence below.
Breeding and selection
Record parent provenance; photograph paired breeders, eggs/fry and juveniles by generation; tally appearance and body types at maturity; retain ordinary segregants rather than assuming every offspring carries the advertised expression. Quantitative inheritance data remain unknown.
Health, nutrition and compatibility
Use standard medaka juvenile/adult feeding and observe body type and fin condition. Do not assume variant-specific medical needs or environmental tolerance without evidence. Species is usually maintained with other appropriately sized peaceful fish; individual competition, fin form and quarantine must be assessed case by case.
Open verification tasks
Verify variant's original Japanese spelling, breeder, parent formula, and contrast with Type R / Type B.
Aquapedia publication decision: retain as a research dossier with explicit evidence state; do not promote uncertain trade subtypes to fully verified independent strains.
Public research references
Listed research leads are not automatically supporting evidence for every individual claim.
No eligible public supporting URLs are attached to this summary yet.