One spot demoiselle
  • Chrysiptera unimaculata
  • EnglishName: One spot demoiselle
  • Local Name : Dhonkaru dhanbaa
  • Size : Common to 6 cm; max. 8 cm
  • Family: POMACENTRIDAE
  • Order : Perciformes
  • Distinctive Characters: Dorsal fin with 13 spines and 13-14 rays. Anal fin with 2 spines and 12-14 rays. Pectoral rays 18-19. Body depth 2.1-2.4 in standard length. Suborbital bones scaleless, their lower edges smooth. Margin of preopercle smooth. Caudal fin slightly forked with rounded lobes.
  • Colour: Generally dark brown with yellowish pectoral fins. A small black spot at the base of posterior dorsal rays. Small juveniles mainly yellow with a blue stripe along back and an ocellus at middle of dorsal fin.
  • Habitat and Biology: Inhabit reef flat areas, exposed to mild or moderate surge up to 2 m. Usually seen among rubble or over barren beach-rock with occasional crevices. Occurs solitary or in small groups. Feeds mainly on benthic algae.
  • Distribution: Indo-West Pacific.
  • Remarks: Chrysiptera unimaculata is sometimes confused with C. biocellata but the former generally lacks a white bar on middle of body. Also C. biocellata tend to be seen in more sheltered areas.