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Hawaiian Longfin Anthias
Pseudanthias hawaiiensis
A beautiful anthias endemic to the Hawaiian Islands, characterized by an elongated dorsal fin and vibrant, striking body coloration.
Water Temperature
22 - 26 °C
pH Value
8.1 - 8.4
Water type
Marine
Tank level
Bottom and middle
Adult size
10 cm
Minimum tank volume
>= 280 L
Minimum group
>= 4
KH
8 - 12 dKH
Species description
Geographical Origin and Habitat: This species is endemic to the Hawaiian Islands and Johnston Atoll in the Central Pacific. It inhabits deep outer reef slopes, drop-offs, and rocky ledges exposed to strong ocean currents, typically at depths of 25 to over 100 meters, where water is cool and oxygen-rich.
Taxonomy and Morphology: Member of the Serranidae family, subfamily Anthiadinae. It features a slender, elongated body and a lyre-shaped tail. Males are distinguished by a highly elongated third dorsal fin spine that forms a long filament. Adults reach a maximum length of approximately 10 centimeters.
Social Behavior: Highly gregarious and peaceful. They form large schools in the water column above the reefs, swimming against the current to feed on drifting zooplankton. They exhibit protogynous hermaphroditism, where a harem is controlled by a dominant male who is replaced by the largest female if he dies.
Coloration and Sexual Dimorphism: Displays striking coloration with significant sexual dimorphism. Males are bright red and orange on the back, with violet sides, and yellow dorsal and caudal fins bordered in hot pink. Females are smaller and mostly yellow-orange with softer pink accents.
Care, breeding and tankmates
Aquarium Setup: Requires a mature marine aquarium of at least 300 liters, providing a large open swimming area and plenty of live rock arranged with caves and overhangs for hiding. Strong water flow created by wavemakers is essential to simulate reef currents. The tank must be securely covered.
Diet and Feeding: Planctivorous carnivore. It must be fed small portions multiple times daily (at least 3-4 times). Offer high-quality frozen foods like vitamin-enriched copepods, mysis, brine shrimp, and fish eggs. Dry food is rarely accepted initially during acclimation.
Water Quality: Demands pristine water with stable reef parameters. Temperature should be kept slightly cooler, between 22 and 25 °C. Maintain pH 8.1 to 8.4, and specific gravity between 1.020 and 1.025. A powerful protein skimmer and frequent water changes are highly recommended.
Compatibility and Cohabitation: Completely reef-safe. Best kept in groups consisting of one male and four or more females to distribute territory. House with peaceful reef fish. Avoid highly active or aggressive tankmates that might outcompete them for food.
Aquarium Breeding: Not successfully bred in home aquariums due to their pelagic spawning habits and the extreme difficulty of raising the fragile larvae through their planktonic stage in closed filtration systems.
Risks and Diseases: Highly prone to stress during transit and acclimation, which often triggers outbreaks of marine ich (Cryptocaryon). The main risk is starvation, as their fast metabolism requires frequent feeding. Provide a quiet, low-stress introduction.
Geographic Origin and Distribution
This species is endemic to the Hawaiian Islands and Johnston Atoll in the Central Pacific. It inhabits deep outer reef slopes, drop-offs, and rocky ledges exposed to strong ocean currents, typically at depths of 25 to over 100 meters, where water is cool and oxygen-rich.
Origin
Tropical oceans and reefs
Fish profile
- Temperament
- Peaceful
- The temperament of Pseudanthias hawaiiensis is generally peaceful towards completely unrelated fish, making them wonderful community residents. However, they establish a strict pecking order within their own group, which can involve some chasing and posturing. The dominant male will frequently display to the females to maintain his status and keep the harem in line. While usually harmless, this internal squabbling requires adequate space and hiding spots for subordinate individuals. They should not be housed with overly aggressive predators that might bully or consume them.
- Diet
- Carnivore
- In the wild, Pseudanthias hawaiiensis is a dedicated zooplanktivore that constantly picks tiny organisms from the water column. In the home aquarium, they require a varied diet consisting of high-quality frozen or live meaty foods. Suitable options include mysis shrimp, enriched brine shrimp, copepods, and finely chopped seafood. Getting them to accept dry prepared foods like high-quality flakes or small pellets can take time and patience. A diverse nutritional profile is crucial for maintaining their vibrant coloration and immune health.
- Life expectancy
- 3-7 years
- The Hawaiian Anthias typically enjoys a lifespan of 3 to 7 years in captivity when provided with proper husbandry. Achieving this requires excellent water filtration, a stress-free environment, and a consistent feeding routine. Regular health monitoring and maintaining pristine water conditions are key to ensuring they reach their maximum lifespan. Minimizing aggression from tankmates also plays an important role in their overall longevity.
- Adult size
- 10 cm
- The catalog's scalar value is 10 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 7.69 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Pseudanthias hawaiiensis (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Harem
- This species exhibits a fascinating social structure characterized by protogynous hermaphroditism, where all individuals are born female. A typical group consists of a single dominant male maintaining a harem of several females. If the dominant male is removed or dies, the largest and most dominant female will morph into a male to take his place. For the home aquarium, it is best to purchase a group of females and allow this natural transition to occur. Keeping multiple males usually results in fatal aggression unless the tank is massive.
- Feeding frequency
- Twice daily
- Due to their incredibly active metabolism and natural grazing behavior, Pseudanthias hawaiiensis requires multiple feedings throughout the day. It is highly recommended to feed them small amounts at least three to four times daily. Infrequent, large feedings are poorly digested and can lead to malnutrition or starvation over time. Automated feeders can be very useful for dispensing small amounts of dry food while the aquarist is away. Consistent, frequent meals are the key to long-term success with this species.
- Bioload
- Pseudanthias hawaiiensis contributes a moderate amount to the overall bioload of a marine aquarium system. Due to their highly active nature and constant swimming, they require frequent feedings which indirectly increases the organic waste produced. Excellent filtration and regular water changes are strongly recommended to process these nutrients. Maintaining a robust protein skimmer will help manage the dissolved organics effectively. Proper husbandry ensures that the bioload remains manageable over the long term.
- Flow
- Strong
- This species originates from dynamic reef environments where strong water movement is a constant factor. Pseudanthias hawaiiensis thrives in aquariums that provide moderate to strong, turbulent water flow across the aquascape. Brisk currents simulate their natural habitat and encourage their natural schooling and feeding behaviors in the water column. Powerheads or wavemakers should be positioned to create broad, sweeping flow patterns rather than harsh, direct streams. Adequate flow also keeps particulate food suspended longer, giving them more time to feed.
- Jump risk
- Yes
- Like many highly active reef fishes, Pseudanthias hawaiiensis presents a moderate to high risk of jumping out of an open aquarium. They are easily startled by sudden movements, lighting changes, or aggressive tank mates, which can trigger a flight response. It is strongly advised to keep a tight-fitting lid or a custom mesh screen over the tank at all times. Even small gaps around equipment and overflow boxes should be covered to prevent tragic accidents. Taking these precautions is a simple but vital part of their husbandry.
- Reproduction
- Oviparous
- Breeding Pseudanthias hawaiiensis in a home aquarium is exceptionally rare and presents significant challenges for even advanced hobbyists. They are pelagic spawners that release their eggs and sperm into the water column during synchronized mating rituals. The resulting larvae are microscopic and require highly specialized, perfectly sized live planktonic foods to survive. Furthermore, the larval stage is extremely long and sensitive to minute changes in water quality. Consequently, nearly all specimens available in the trade are wild-caught rather than captive-bred.
- Compatibility & tankmates
- Reef safe
- This species is generally considered completely reef safe and makes a stunning addition to mixed reef aquariums. Pseudanthias hawaiiensis will typically ignore corals, sessile invertebrates, and most motile invertebrates like ornamental shrimp. They are generally peaceful towards heterospecifics but can display significant aggression towards other Anthias species. It is usually best to keep them as the only Anthias species in the tank unless the aquarium is exceptionally large. Careful observation is needed when introducing new tank mates to ensure harmony.
- Tank level
- Middle/Bottom
- Throughout the day, Pseudanthias hawaiiensis will predominantly occupy the middle to upper levels of the water column. They are highly visible fish that love to hover above the reef structure, facing into the current to catch passing food. At night or when frightened, they will quickly dart into the rockwork to seek shelter in crevices and caves. Providing plenty of open swimming space alongside complex rock formations is essential for their comfort. Their active presence brings a wonderful sense of movement and life to the upper reef zones.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 3.3 ± 0.4 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.75
- Bayesian Length-Weight
- a = 0.01413, b = 3
- VulnerabilityLow vulnerability (10 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
