Palette Surgeonfish
Paracanthurus hepatus
Overview
It is recognisable by its royal blue body, black markings and yellow tail.
Adults typically reach about 25cm to 31cm in length and weigh up to 0.6kg.
- Found in
- Indo-Pacific reefs and coasts
- Class
- Actinopterygii
- Order
- Acanthuriformes
- Family
- Acanthuridae
- Genus
- Paracanthurus
Conservation Status
The palette surgeonfish is a species of Least Concern, but is vulnerable to habitat degradation combined with high juvenile mortality. They are highly sought-after in the marine aquarium trade for their striking colours and fame but are not easily bred in captivity. Most specimens are collected directly from the wild, potentially damaging both fish and coral habitats. Climate change, ocean acidification, and coral bleaching threaten the reef ecosystems they depend on for shelter and food.
Scientists, conservation groups, and aquaculture institutions seek to reduce reliance on wild-caught fish, with the first captive breeding success in 2016. Marine protected areas, reef restoration projects, and stricter regulation of the aquarium trade play key roles in mitigating pressures. Public awareness campaigns encourage buying responsibly sourced fish, while international conservation efforts protect coral reef ecosystems more broadly.
These combined strategies safeguard the palette surgeonfish and help preserve the tropical reef communities where they serve an important ecological role.
- Wild Population
- Unknown
- Conservation Status
- Least concern
Animal Facts
- The palette surgeonfish, like all surgeonfish, has sharp scalpel-like spines near its tail that are used for defense.
- The palette surgeonfish is the only species within the genus Paracanthurus.
- Juvenile palette surgeonfish are bright yellow.
- Palette surgeonfish are omnivorous grazers, feeding on the zooplankton and algae in reef systems.
- Palette surgeonfish can live for up to 30 years in the wild, making them a very long-lived reef fish species.
Planet Zoo 2 is in active development and the Zoopedia reflects this work in progress. Text, images, stats etc. are not necessarily final and may change or be expanded upon.
Social & Reproduction
Palette surgeonfish may live solitarily, in pairs, in small groups or larger loose aggregations depending on the reef environment and food availability.
The palette surgeonfish reproduces through broadcast spawning year-round, with peaks between April and September. Males court females by circling, darting, and nudging them before pairs or small groups rush upward in the water column to simultaneously release eggs and sperm. Spawning events often occur at dusk or follow lunar cycles.
A single female can release up to 40,000 buoyant eggs in one event. These eggs, suspended by oil droplets, are fertilised externally and hatch within 24 to 28 hours. The resulting larvae are planktonic, drifting with ocean currents while feeding on microscopic plankton. As they develop, the larvae begin to show yellow colouration and eventually settle on coral reefs, where the juveniles take shelter among branching corals.
As they mature, palette surgeonfish join loose schools on reefs. They become reproductively mature around 9 to 12 months old. Juveniles are mostly bright yellow, gradually transitioning to the iconic blue, black, and yellow pattern of adults.