Half Black Angelfish

Note Fish shown is a half black veiltail

Half black angels are one of the oldest varieties of domestic angelfish (developed in by a Belgian fish breeder, M. Carels, shortly after the second world war); despite this they are not very readily available. The reason for their scarcity is that they only develop their distinctive colouration when raised in optimum conditions. Over-crowding or under-feeding will result in fish that look like normal silver angels. To further complicate matters their colouration is due to a recessive gene, the expression of which, many suspect, may be further influenced by "modifier genes". The upshot of this is that "outcrossing" to strengthen a line may require several generations before good examples are once again being produced.

Genetic code for a half black is hb/hb