Chromis viridis
4-6 cm
It belongs to the class Actinopterygii, order Perciformes, family Pomacentridae, and genus *Gymnodon*. Appearance and color: The entire body is a bright, pale blue-green to pale green, with a slightly whitish belly. During the breeding season, the male's body color gradually changes to a yellowish tinge, while the posterior half of its body gradually turns black.