When Do Naturally Spawned Koi Fry Develop Their Adult Colors?

Koi vs. Goldfish Color Timing

Goldfish: start drab, color up after 1-2 inches. Koi: show pattern almost from "visible fish" stage (1/2 inch).

Your Fry at 5-6 Inches

Should be near final pattern. Lighter color may indicate:

• Pale parents (yamabuki, platinum, etc.)
• Poor diet (lack carotenoids).
• Genetic throwback.

Check Parentage

What colors are the adults? If all are vibrant, the fry may still deepen. "Don't give up"—koi color can intensify into year 2-3.