Katherine's Fairy Wrasse - Female
Katherine's Fairy Wrasse - Female
Goes well with:
FAQs Answers to the most common questions.
How do I tell a male Katherine’s Fairy Wrasse from a female or juvenile, and will the colors change after purchase?
Males develop the species’ showy terminal coloration: stronger pink-red/orange body tones, brighter blue/green facial highlights, and more extended fins, especially the dorsal and tail margins. Females and juveniles are usually smaller, plainer, and more tan, peach, or brownish with less pattern intensity. In a healthy tank, a female or juvenile can transition to male if no dominant male is present, but the change is gradual and depends on social conditions, diet, and overall stability. Newly purchased individuals may also look muted from stress, so expect the full coloration only after acclimation and consistent feeding.
What tank size and setup does Katherine’s Fairy Wrasse really need to stay healthy long-term?
A minimum of 75 gallons is the practical starting point, with 90+ gallons being much better if you want stable water quality and room for swimming. They are active, open-water wrasses that appreciate long horizontal space, a tight-fitting lid, and plenty of rockwork with caves and crevices for nighttime sleeping and retreating. A sand bed is helpful but not as essential as for sand-burying wrasses. Keep the aquascape secure, with sheltered zones and open lanes, because they can be skittish and may dash when startled.
Will Katherine’s Fairy Wrasse eat shrimp, snails, or other cleanup crew in a reef tank?
It is generally reef-safe and usually ignores corals, snails, and most cleanup crew. It may opportunistically pick at tiny ornamental crustaceans like very small shrimp, copepods, or amphipods, especially if they fit its mouth, but it is not typically a predator of larger cleaner shrimp or snails. Like many fairy wrasses, it is much more likely to hunt microfauna and frozen meaty foods than bother established reef invertebrates. Still, very small decorative shrimp and newly introduced tiny livestock should be watched.
What should I feed Katherine’s Fairy Wrasse to keep its color strong and prevent it from wasting away?
Feed a varied diet of small meaty foods multiple times per day if possible: enriched mysis, finely chopped seafood, quality marine pellets, frozen copepods, and other planktonic fare. This species does best with frequent feeding because it is an active forager with a relatively high metabolism. Color and body condition improve when the diet includes carotenoid-rich foods and regular vitamin enrichment. A tank with live rock and pod production is a big plus, but it should not be relied on as the only food source.
How aggressive is Katherine’s Fairy Wrasse, and can I keep more than one fairy wrasse together?
It is usually peaceful to semi-peaceful, but males can be assertive toward similar-looking fairy wrasses, especially other males in the same genus or closely related species. In larger tanks, it can often be kept with other wrasses if introduced carefully and if there is enough space and multiple hiding areas. The safest approach is to keep one male with females or with dissimilar tankmates, or to add fairy wrasses at the same time in a sufficiently large aquarium. Like many wrasses, it may become more territorial if underfed or cramped.
All listed sizes are approximate, not guaranteed, and may vary slightly.
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
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Jumping risk: A securely fitted mesh screen or aquarium lid is essential.
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Peaceful disposition: Best maintained with peaceful to moderately assertive marine fish rather than highly aggressive tankmates.
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Wrasse compatibility: Territorial behavior can occur toward similar fairy or flasher wrasses, especially between mature males.
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Active feeding requirements: Benefits from multiple small meals of nutritious plankton-sized marine foods throughout the day.
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Sexual coloration: Females and juveniles are more uniformly orange-red, while mature males develop stronger blue markings and elongated fins.
