FishCommonVisible while snorkeling

Yellowbar angelfish

Pomacanthus maculosus

An arm-length blue giant with a glowing yellow crescent on its flank – and when startled it produces a thump you can feel through the water.

Photo: iNaturalist – (c) zsispeo, some rights reserved (CC BY-NC-SA)

The yellowbar angelfish (Pomacanthus maculosus) is one of the largest and most striking angelfish on Hurghada's reefs: a glowing, irregular yellow crescent marks its 40-centimetre bluish-purple body – so distinctive that old Arab fishermen called it the "map fish", the blotch resembling a continent. The tail is pale yellow with a finely marbled pattern. Juveniles look entirely different – dark blue with vertical white-and-light-blue stripes – and are often mistaken for another species.

It lives the classic life of a big Pomacanthus: territorial, claiming a stretch of reef that it patrols daily with slow, dignified strokes. It is an omnivore with a preference for sponges and algae. Its most theatrical trait is its voice: when startled it produces a deep drumming thump that carries far underwater – more than one diver has flinched at it in the dark corner of a wreck.

Around Hurghada you will meet it in sheltered lagoons, around wrecks and on plateaus dotted with coral blocks, from 3 down to 30 metres. One or two large individuals almost always cruise the El Mina wreck. It is not skittish: if you do not chase it, it will calmly pass you by, the yellow crescent glowing through the blue haze – snorkelers have a fair chance of seeing it in the shallower lagoons too.

Did you know?

Its thumping call does not come from its mouth: it vibrates its swim bladder like a drumhead. The sound is strong enough that researchers believe it marks territory and deters intruders – startling divers is just a bonus.

Where can you meet it?

An encounter at the El Mina wreck is almost guaranteed, and big individuals also patrol the El Fanadir plateau, the coral blocks of Abu Ramada and the sheltered lagoons of Giftun.

Frequently asked questions

Yes: when startled or defending its patch it emits a deep drum-like thump that you hear clearly underwater – you almost feel it in your chest. Completely harmless, but quite a surprise the first time.

Quite likely: it frequents sheltered lagoons and shallow plateaus, and its size and yellow crescent are hard to miss. The biggest individuals, though, prefer wrecks and deeper coral blocks.

The striped "baby outfit" is protection: adults do not see the striped juveniles as rivals, so they tolerate them inside their territory. As the fish grows, the stripes gradually give way to the blue body and yellow bar.