About Neoglyphidodon polyacanthus (Ogilby, 1889)
Adults of Neoglyphidodon polyacanthus can reach a maximum length of 12 centimetres (4.7 inches). Adults and juveniles of this species differ in coloration: adult Neoglyphidodon polyacanthus are grayish black, while juveniles are yellow with blue lines that run from the eye to their eyespot. Individuals gradually lose their juvenile coloration as they mature. This fish species lives on reefs in the western Pacific Ocean. Its confirmed range extends from the southern Great Barrier Reef in Australia and New Caledonia, and it is found throughout Lord Howe Island. Adults live outside lagoons, while juveniles inhabit lagoons. The species occurs at depths between 2 metres (6.6 ft) and 30 metres (98 ft).
