Katherine's Fairy Wrasse - Female

Katherine’s Fairy Wrasse (Cirrhilabrus katherinae) is a beautiful and relatively compact saltwater fish prized for its refined coloration, graceful swimming behavior, and excellent suitability for reef aquariums. Females and juveniles are predominantly warm orange-red, while mature males develop a more elaborate pattern with reddish coloration through the middle of the body, lighter areas along the back and belly, brilliant blue accents along the dorsal and anal fins, and elongated pelvic fins.

Native to the western Pacific, including southern Japan, Guam, and the Mariana Islands, this species inhabits exposed outer reef environments where it swims above coral and rubble structure in search of zooplankton. Katherine’s Fairy Wrasse brings continuous movement and attractive coloration to a marine aquarium without becoming overly large, making it an appealing choice for established reef systems and peaceful fish-only aquariums.

Generally peaceful with unrelated species, this fairy wrasse can become territorial toward similar Cirrhilabrus wrasses, particularly as males mature. Providing adequate swimming space, secure rockwork, and carefully selected tankmates helps this active species settle comfortably into the aquarium.

Quick Care Guide

Care Level: Easy to Moderate
Minimum Tank Size: 50 gallons
Temperament: Peaceful
Diet: Carnivore / Planktivore
Reef Safe: Yes
Region: Western Pacific – Japan, Guam, and Mariana Islands
Scientific Name: Cirrhilabrus katherinae

Tank Requirements

Provide a mature saltwater aquarium with substantial rockwork for shelter while leaving generous open areas for swimming. Caves, crevices, and overhangs allow the wrasse to retreat when startled and provide secure nighttime resting areas.

A sand bed is not required because fairy wrasses typically sleep within rockwork rather than burying themselves. Moderate to strong, varied water movement is appropriate and complements the active swimming behavior of this outer-reef species.

A tight-fitting mesh screen or secure aquarium lid is essential. Katherine’s Fairy Wrasse is an accomplished jumper and may leave an uncovered aquarium when startled, chased, or newly introduced. Openings around plumbing, cables, and filtration equipment should also be secured.

Diet and Feeding

In its natural habitat, Cirrhilabrus katherinae feeds primarily on small zooplankton captured from the water column. Aquarium specimens should receive a varied diet rich in appropriately sized marine proteins.

Offer enriched mysis shrimp, enriched brine shrimp, copepods, finely chopped shrimp and other marine seafood, quality frozen marine blends, and appropriately sized marine pellets or flakes. Rotating several foods helps support healthy body condition and vibrant coloration.

Two to three smaller feedings per day are beneficial for this active planktivore when practical. Newly introduced specimens may initially prefer frozen or live-style foods before readily accepting prepared diets.

Temperament and Tankmates

Katherine’s Fairy Wrasse is generally peaceful and well suited to community marine aquariums. Appropriate tankmates include gobies, blennies, cardinalfish, clownfish, peaceful angelfish, tangs, and other non-predatory species that will not continually intimidate it.

Some displaying, chasing, or territorial behavior may occur toward other fairy and flasher wrasses, particularly males with similar coloration or body shape. Multi-wrasse aquariums benefit from additional swimming space, numerous hiding areas, and carefully planned introductions.

A single specimen works well in most aquariums. In larger systems, it may also be maintained with compatible fairy wrasses or as part of a carefully managed mixed-sex group.

Reef Compatibility

Katherine’s Fairy Wrasse is considered reef safe and does not normally damage or consume corals, clams, or other sessile reef organisms. Its small size and plankton-feeding behavior make it especially well suited to coral-dominated reef aquariums.

It is also generally compatible with ornamental shrimp, crabs, snails, and other common reef invertebrates. Naturally occurring copepods and other tiny microcrustaceans may be consumed as part of its normal feeding behavior.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Maintain stable, well-oxygenated water with consistently good water quality. Stability is more important than targeting one exact value within these ranges, and sudden changes in salinity or temperature should be avoided.

Common Considerations

• Jumping risk: A securely fitted mesh screen or aquarium lid is essential.

• Peaceful disposition: Best maintained with peaceful to moderately assertive marine fish rather than highly aggressive tankmates.

• Wrasse compatibility: Territorial behavior can occur toward similar fairy or flasher wrasses, especially between mature males.

• Active feeding requirements: Benefits from multiple small meals of nutritious plankton-sized marine foods throughout the day.

• Sexual coloration: Females and juveniles are more uniformly orange-red, while mature males develop stronger blue markings and elongated fins.