Species · GBIF taxon 5209178
Achilles Tang
Acanthurus achillesAlso known as Redtail Surgeonfish, Redspot Surgeonfish
Achilles tangs patrol high-energy surge zones of coral reefs, grazing constantly on filamentous algae with their specialized teeth. Their striking black bodies are punctuated by a brilliant orange teardrop patch near the tail, which highlights the razor-sharp caudal spine used for defense. These highly territorial fish actively defend their feeding territories from other herbivores to secure their food supply.
MarineReef-dwellingTerritorial
Licensed reference(c) Jean, some rights reserved (CC BY) · cc-by
- diet
- Herbivorous (primarily filamentous algae and macroalgae)
- family
- Acanthuridae
- threats
- Habitat degradation, coral bleaching, and overcollection for the aquarium trade
- life Span
- 30 to 45 years
LC
Equipped with sharp caudal spines that can inflict deep cuts; avoid handling.
Possesses modified, razor-sharp scales called caudal spines on either side of the tail base that can slice skin deeply when the fish thrashes.
Never corner or attempt to handle this fish; admire its swift swimming from a safe distance.- Surge Zone Spotting: Look for them in shallow, turbulent waters where waves crash over the reef crest.
- Keep Distance: Give them space while snorkeling, as they can be highly territorial and protective of their grazing patches.
- Watch the Tail: Observe the bright orange spot near the tail, which signals the location of their defensive spine.