Research overview
Explore how the Japan Medaka Association separates trait-based descriptions from trade names, breeder lines and unsupported genetic ancestry, with practical identification pointers.
What the classification actually does
An association classification provides consistent language for visible traits. A fish's trade name, breeder lineage, appearance and verified genotype are distinct kinds of information. Keeping these distinctions allows researchers to compare similar-looking animals without inventing shared ancestry.
Traits breeders should record
Aquapedia entries should record observed body color, transparent or semi-transparent scale effects, eye shape, lamé versus external body light, fin form and body proportions separately. Observation conditions such as viewing angle and background may affect the result.
Origin claims and uncertainty
The association manual contains historical breeder credits and descriptions of how particular varieties developed. Those are valuable attributed documentary claims, but they are not independent DNA verification of every descendant sold under the same nickname.
Copyright and source status
This is independent Aquapedia commentary, not an official or complete English translation of the JMA manual. Read and download the original fifth-edition source directly at the Japan Medaka Association website. Private study translations are not offered here.
Full English translation permission: pending (October 18, 2026)
Aquapedia Research sent a request in Japanese to the Japan Medaka Association on October 18, 2026, seeking written permission to publish a complete English text, an English PDF, and any included charts and photographs whose rights can be cleared. JMA has not yet granted permission. This page remains an independently authored English research companion, not a complete JMA manual translation. Read the official original at the source link below.
Expanded Aquapedia classification field guide
Explore 13 independent educational studies, a 63-term Japanese/English observation atlas and 54 new breeder questions ↗. This is Aquapedia original English commentary, not a JMA-endorsed or copied translation.
Source, permissions and confidence
Original fifth-edition Japanese manual © Japan Medaka Association. Private translations may not be redistributed or reproduced on this site without written authorization.