Understanding Lineage and Fixation
Jun 27, 2026 · AMA Admin
Why AMA talks about “lineage” and “fixation” so often — and what they mean for a strain.
Medaka are incredibly diverse, and not all strains are stable.
Fixation refers to how reliably a strain passes on its traits. Without it, a “strain” can disappear in just a few generations.
Lineage connects us to a strain's origins and the work of its creator (作出者). Understanding both is the foundation of responsible breeding and honest representation.