The powder-blue surgeonfish is a striking Indo-Pacific reef fish named for the razor-sharp, scalpel-like spines located at the base of the tail — defensive weapons as sharp as a surgeon’s blade. Surgeonfish are among the most important grazers on coral reefs, consuming algae at such volumes that they prevent overgrowth from smothering coral. They often form large schools that overwhelm territorial damselfish defending algae patches, allowing efficient group foraging.
About the Surgeonfish
Acanthurus leucosternon
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💡 Fun Facts
01
Surgeonfish have one or more retractable or fixed scalpel-like spines on the caudal peduncle that can slash open the hand of a careless handler, giving the family its common name.
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A single large surgeonfish can consume its own body weight in algae every day, making surgeonfish schools essential to preventing algal takeovers of bleached or disturbed coral reefs.
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Surgeonfish larvae spend weeks to months drifting in the open ocean as transparent 'acronurus' larvae — one of the most distinct larval forms of any reef fish — before metamorphosing and settling on a reef.
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Surgeonfish can live up to 45 years on a coral reef, with annual growth rings visible in their ear bones (otoliths) similar to tree rings.
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Some surgeonfish species spawn in precisely timed spawning aggregations that coincide with full or new moons — up to 10,000 fish gathering at specific reef promontories.
📍 Where to Find This Animal
Habitat Types:
Coral Reef (Indo-Pacific)
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