Fauna
Species

Atlantic Blue Tang

Acanthurus coeruleus

Also known as Blue Barber, Blue Doctorfish, Blue Tang Surgeonfish, Yellow Doctorfish

Atlantic blue tangs undergo a dramatic color transformation, starting life as bright yellow juveniles before maturing into deep blue or purple adults. These active herbivores roam coral reefs in large, single-species schools or mixed-species grazing groups, keeping algae growth in check. Their most distinctive defense is a pair of razor-sharp, spine-like scales at the base of the tail that fold into horizontal sheaths.

MarineReef-dwellingColorful
Atlantic Blue Tang reference1 / 7
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyFilamentous Algae, Macroalgae, Detritus
Predators
  • Groupers
  • Snappers
  • Moray Eels
ThreatsHabitat degradation, coral bleaching, and collection for the aquarium trade.
HabitatsCoral reefs, rocky inshore reefs, and grassy flats.
Life span12 to 20 years
Classification
  1. FamilyAcanthuridae
  2. SpeciesAcanthurus coeruleus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Possesses razor-sharp caudal spines that can inflict deep cuts; do not touch or handle.
Why it is dangerous
Possesses spine-like modified scales on either side of the tail base that are razor-sharp and can inflict deep, painful lacerations.
How to recognize a risky encounter
Look for a bright yellow or white spine sheath near the base of the tail on a deep blue, oval-shaped body.
What to do
Never attempt to grab or handle a live fish; if caught on a line, use thick gloves and a dehooking tool.
Responsible observation
  • Snorkeling Approach: Move slowly and predictably to watch them graze without scattering the school.
  • Look for Juveniles: Search shallow patch reefs and seagrass beds for the bright yellow juveniles.
  • Observe Cleaning Stations: Watch for them posing head-down to let cleaner wrasses pick off parasites.
Related species
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