What is "centropyge"

Centropyge (common name: dwarf angelfish) is a genus of marine angelfishes. The genus is the largest within the Pomacanthid family, comprising over 30 described species. Species in this group do not exceed 15 cm (approximately six inches) in length and live in haremic structures with one dominant male and multiple females. Although it is hard to identify their gender; females are often shorter and more round finned (which is more obvious when looking at a group of specimens). Like many other reef fish and all marine angelfish, species in this genus are protogynous hermaphrodites, meaning that they start their adult lives as females and the dominant individual in a group can change to a male within days. A reversal of this sex change is possible if the social status of the individual changes, it is however a process that requires much more time (weeks to months).