Breeding the Rosy-Scales Fairy Wrasse (Cirrhilabrus rubrisquamis)

Cirrhilabrus rubrisquamis is a poorly known mesophotic fairy wrasse from the Chagos Archipelago. Its deep habitat and pelagic larvae place breeding far outside home aquaria; this guide outlines its known biology.

Overview

Cirrhilabrus rubrisquamis (Randall & Emery, 1983) is native to the Chagos Archipelago in the Indian Ocean, where it lives on mesophotic reefs at depths of 41 to 70 m and reaches about 7.2 cm standard length. The species is generally very poorly known and is listed as Data Deficient by the IUCN; a population once attributed to it in the Maldives was reclassified as a separate species, C. finifenmaa, in 2022. As a member of the genus it follows the fairy-wrasse pattern of protogyny and pelagic spawning.

Sexing

Detailed dimorphism data for this little-studied species are limited, but as a Cirrhilabrus it is a protogynous hermaphrodite in which all individuals begin as females and the dominant member of a group changes into a functional male. The resulting terminal male is the largest fish and carries the brighter coloration and longer fins characteristic of the genus, while females remain smaller and plainer.

Spawning Behavior & Trigger

Genus-wide reproductive behaviour applies: a dominant male courts a harem of females using a rapid 'flashing' display that briefly reveals metallic blue or violet patches absent at rest, signalling male identity, deterring rivals and advertising spawning readiness. Spawning is a brief paired rise into open water where buoyant eggs and sperm are shed together. The species' deep, mesophotic habitat means these events occur well below the depths typical aquarists observe.

Egg & Fry Care

Fairy wrasses broadcast small buoyant eggs that hatch into planktonic larvae, with no nest, guarding or parental care. The larvae drift and feed in open water during a prolonged pelagic phase. There is no documented method for rearing the larvae of this rarely imported species, and captive breeding has not been reported.

Common Challenges

Two obstacles compound here: the species is a deep mesophotic fish that is uncommon in the trade, and like all fairy wrasses its planktonic larvae cannot be raised in home systems. Any attempt to keep adults in conditions resembling their habitat must account for their deep-reef origin and zooplankton-based feeding.