Lunare Wrasse - Fiji

The Fiji Lunare Wrasse, Thalassoma lunare, also known as the Moon Wrasse or Lyretail Wrasse, is a brilliantly colored and highly active saltwater fish. Adults develop rich green to blue coloration accented by vertical red to violet lines, intricate pink and turquoise markings across the face, blue-edged fins, and a striking yellow crescent within the lyre-shaped tail. Mature terminal males become especially vivid, often developing a blue head that transitions into green across the body.

Fiji lies within the natural Indo-Pacific distribution of this widespread reef species. Around the islands, Lunare Wrasses inhabit shallow lagoon reefs, reef flats, and protected seaward reefs, where they spend much of the day rapidly cruising over coral and rock structure in search of small benthic invertebrates, fish eggs, and other animal prey.

Capable of reaching approximately 18 inches at maximum adult size, this is a substantial and energetic marine aquarium fish that requires significantly more swimming space than juvenile specimens might suggest. Its intense coloration and confident personality make it an impressive centerpiece for a large fish-only aquarium or carefully planned predator-style reef, although ornamental invertebrates are at considerable risk.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 180 gallons
Temperament: Semi-aggressive
Diet: Carnivore
Reef Safe: With Caution
Region: Fiji / Indo-Pacific
Scientific Name: Thalassoma lunare

Tank Requirements

Provide a large aquarium with extensive horizontal swimming space and substantial, securely positioned rockwork. Caves, ledges, and sheltered retreats are beneficial, but the aquascape should remain open enough for this fast-moving wrasse to cruise freely throughout the system.

Stable rockwork is important because mature specimens are powerful and inquisitive foragers that may investigate crevices and disturb loose rubble while searching for food. A sand substrate can provide a natural appearance, although this species does not require a deep sand bed for sleeping.

Moderate to strong water movement, excellent oxygenation, and efficient filtration are recommended. The Lunare Wrasse has a high activity level and benefits from clean, well-circulated water.

A tightly fitted lid or secure mesh cover is essential. Thalassoma wrasses are powerful jumpers and can escape through surprisingly small openings when startled or during territorial interactions.

Diet and Feeding

The Lunare Wrasse is a carnivorous reef predator that naturally feeds primarily on small benthic invertebrates and fish eggs, along with other available animal prey.

Offer a varied captive diet including mysis shrimp, enriched brine shrimp, krill, chopped shrimp, clam, mussel, squid, and other appropriately sized marine seafood. High-quality frozen carnivore blends and marine pellets can also be incorporated once the fish readily accepts prepared foods.

Feed one to two substantial meals per day, adjusting portion size according to the fish's body condition and activity level. Smaller specimens may benefit from somewhat more frequent feeding.

Regular feeding will not eliminate its natural hunting instincts, so ornamental invertebrates should not be assumed safe simply because the wrasse is well fed.

Temperament and Tankmates

The Fiji Lunare Wrasse is active, confident, and semi-aggressive. Territorial behavior often becomes stronger as the fish matures, particularly in large terminal males.

Suitable tankmates include robust tangs, rabbitfish, larger angelfish, compatible triggerfish, larger wrasses, and other substantial peaceful to semi-aggressive marine fish capable of handling its energetic behavior.

Small, timid, or slow-moving species may be intimidated by its constant activity. Very small fish should also be selected cautiously around a mature adult.

Keeping a single Lunare Wrasse is generally the most straightforward arrangement. Additional Thalassoma wrasses or similarly assertive species require substantially more space and careful introduction planning.

Reef Compatibility

The Lunare Wrasse is reef safe with caution. It does not normally target healthy coral tissue, so SPS, LPS, and soft corals can potentially be maintained with the fish.

The primary concern is predation on mobile invertebrates. Ornamental shrimp, crabs, hermit crabs, snails, brittle stars, small sea urchins, mollusks, and other suitably sized reef animals may be hunted and consumed.

Large specimens may also disturb loose coral frags, shells, or rubble while searching the aquascape for prey. It is therefore best suited to a robust reef aquarium where ornamental invertebrates are not a priority or to a fish-only-with-live-rock system.

Water Parameters

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

Stable salinity, strong oxygenation, and consistently good water quality are more important than maintaining exact values within these ranges.

Common Considerations

• Large adult size: Maximum length can approach 18 inches, requiring substantial permanent swimming space.

• Fiji collection locality: Fiji is part of the species' natural Indo-Pacific distribution and does not require different husbandry from other Thalassoma lunare populations.

• Predatory toward invertebrates: Shrimp, crabs, snails, mollusks, brittle stars, and other mobile invertebrates may become prey.

• Increasing territoriality: Mature specimens can become assertive, particularly toward other wrasses.

• Secure lid essential: This fast, powerful wrasse is an accomplished jumper and should always be kept in a tightly covered aquarium.