Neon Damselfish Pomacentrus coelestis

The Neon Damselfish is native to reefs and lagoons of the eastern Indian Ocean and the western Pacific, from Sri Lanka to Japan/Hawaii/northern Australia. It grows to 9cm long.

It looks almost identical to the Caerulean Damselfish, Pomacentrus caeruleus, of the western Indian Ocean, which has blue and yellow in similar places and grows to 10cm. The main difference between the two species other than geography is DNA.

A number of other damselfish in the Pomacentrus genus with yellow bellies (eg the Goldbelly, P. auriventris) called the "coelestis complex" look a little similar but have more visible differences.