Orange-Back Wrasse

Cirrhilabrus aurantidorsalis

The orange-back wrasse, known scientifically as Cirrhilabrus aurantidorsalis, is a small reef fish endemic to the waters of northern Sulawesi, Indonesia, particularly around Lembeh and Tomini Bay. Divers can spot these fish in coral reef habitats at depths ranging from 10 to 25 meters. They exhibit a fusiform body shape with a distinctive yellow-to-orange coloration along their back, which becomes more pronounced in males. Males also feature a dark-red crown-like mark on their head, setting them apart from females and juveniles. This species is known for its social structure, living in harems with one dominant male and several females. The orange-back wrasse is thought to be a protogynous hermaphrodite, meaning individuals start as females and some transform into males as they mature. These fish primarily feed on zooplankton, using their specialized teeth to break down their food. While diving, encountering a group of orange-back wrasses can be an interesting experience as they swim along the edges of reefs, often in small groups. They are generally harmless to humans and are sometimes found in the marine aquarium trade. According to the IUCN Red List, the species is currently categorized as Least Concern.