Which कोई मछली breeds come in काला?

Club breed standards describe काला for the कोई.

कोई मछली color

काला

Solid black pigment. In birds often with a green or purple sheen; on skin, legs, beak, comb and tongue the dark pigment some standards call for.

8 कोई मछली breeds list काला. It is in a club standard for 4 breeds.

Breed	JNPA
कोईसांके	मानक (“black imprints (urushizumi)”)
कोईशोवा	मानक (“black body (black background)”)
कोईबेक्को	मानक (“black imprints shaped like spots”)
कोईउत्सुरी	मानक (“black body (black background)”)

How काला can appear or change over an animal's life.