Koi pattern
Effen
One color all over with no pattern or white: self in rabbits, cavies, rats and canaries; a tongue or hoof of one even color.
3 Koi breeds list Effen. It is in a club standard for 1 breed.
Breeds whose standards accept Effen
| Breed | JNPA |
|---|---|
| KoiOgon | Standaard (“no imprints; the whole body one color”) |