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Halfblack Locus

Non-wild alleles at this locus:
Halfblack (h)

Possible phenotypes:
Halfblack (h/h)

Halfblack (h/h)
Half Black

Halfblack is a recessive gene and does not affect the phenotype when in single dose (h/+). In double dose however, the rear portion of the fish, from the last body stripe to the tip of the tail is black, the fins (or the rear portion of them) are also black. Expression of Halfblack is very sensitive to environmental conditions. Requirements for the pattern expression have not been totally worked out and documented, though lighting intensity and duration, water volume per fish, food and frequency, have all shown to play a large part in getting fry to eventually "turn". Some people have reported better success with expression of Halfblack when using dark colored gravel or a dark painted tank bottom. As a result fry from a Halfblack pair do not always express the phenotype even though they carry the mutation. Furthermore it is possible to get expressing Halfblack fry from non-expressing Halfblack parents.

 

Phenotypes resulting from Halfblack (h) and other mutations

Mutations

(h/h)

Ghost (S/+) Halfblack Ghost
Half Black Ghost
Blushing (S/S) Halfblack Blushing
Half Black Blushing
Zebra (Z/+ or Z/Z) Zebra Halfblack
Zebra Half Black
   



Links to more information about the Halfblack allele
Dr. Joanne Norton, FAMA: August 1985, Vol.8, #8
Dr. Joanne Norton, FAMA: May 1989, Vol.12, #5

Dr. Joanne Norton, FAMA: December 1993, Vol. 16, #12

Approved by The Angelfish Society Standards Committee on February 11, 2007.