Miyuki Medaka appraisal

External body sheen (metallic light on the back) is the most distinctive characteristic. When the sheen coverage extends continuously from head to the tip of the tail fin—referred to as "full body"—it is considered the highest grade, with the extent of the sheen and the clarity of color being the essence of the evaluation.

解説用イラスト: Miyuki Medaka — AI-generated illustration for explanation. Not an actual listed individual.

What determines the price

Extent of body sheen coverage (full body, etc.)
High
Body sheen (the metallic light on the back) coverage from head to tail tip is the core of evaluation. Greater full-body coverage receives higher ratings.
Color and clarity of body sheen.
High
The combination of body sheen color (such as silver, blue, green, or sky blue) with the base body color affects quality. Individuals with clear, vivid sheen are rated higher than those with dull sheen.
Body Shape Balance
Medium
As a foundation for displaying body sheen effectively, proper body shape is also important.
Strain Stability
Medium
Lineage information regarding whether body sheen appears stably across generations is also valuable for evaluation.

Appraisal points

Check the extent of body sheen coverage.

Good:: The external light stripe extends unbroken from the head to near the base of the tail fin (full-body or better).
Caution:: Individuals with the light stripe only on part of the back are at a selection stage with weak external coloration.

Examine the color and clarity of the light stripe.

Good:: The external light stripe is clear and luminous, with beautiful harmony between the stripe and base color.
Caution:: If the stripe is dull or has a brownish tint, condition assessment is necessary.

Examine the condition of the tail fin.

Good:: The tail fin is symmetrical on both sides and spreads cleanly, with the external light stripe continuing to the tail fin.
Caution:: Bent or missing tail fins may indicate transport damage.