Pomacentrus coelestis (Jordan and Starks, 1901)
Abundant in the Solitary Islands Marine Park. Distributed through the eastern Indian Ocean and western Central Pacific region, north to southern Japan, south to Lord Howe Island. In Australia recorded from Western Australia, across the tropical north to Queensland, south to southern NSW, and including Lord Howe Island.
Frequents coastal and outer reefs. Hides in coral or under rocks if approached too closely. Feeds on zooplankton in the water column. Depth to 20m.
The brilliant blue makes them a much-remembered fish by snorkellers as they are so noticeable. Usually found in groups and possess a darting swimming motion, close to the substrate. Sometimes seen in association with Yellowfin Demoiselle, Chrysiptera flavipinnis. Grows to 8cm.