Zebra angelfish are often confused with silver angels but differ from them in having an extra vertical body band. There is considerable variation seen in the thickness of these bands and also in terms of the straightness, sometimes, as with the fish shown here, additional broken spots, dots and bars are present. Zebras often show more blue colouration around the head and in the fins compared to silver angels. The dorsal fin pattern can also be quite distinctive, with more striations and a spotted or broken pattern.
The zebra pattern is caused by a single dominant gene, homozygous individuals tend to grow more slowly than heterozygous and wild type fish, why this should be is not known.