WHATSTHATFISH
Bony fish

Ringtail Surgeonfish

Acanthurus blochii

Also known as: Dark Surgeon, Dark Surgeonfish, Dark Tang, Elongated Surgeonfish, Doctorfish, Lancetfish, Ringtail Surgeon, Ringtail Tang, Tailring Surgeon, Tailring Surgeonfish, Thorntail, Thorntail Fish, Whitetail Lancet

LCLeast ConcernIUCN Red List, 2012
Adult
@greatwhite · Tippo, Ribbon Reef, Live-aboard, Great Barrier Reef, Australia · May 20151 / 10

Showing details for the adult stage. Switch stages to see how it differs.

01

Overview

Found in small schools, over sandy areas of outer lagoons and seaward reefs, rich in algae growth.

Surgeonfish have a blade like spine in the tail that points outwards when bent, unicorns have two hook-like plates along the tail, these are used for defence and are as sharp as a surgeons scalpel, hence the name "Surgeonfish".
Some species are venomous.

02

How to identify

Fins & Tail
white tail ring
Behaviour
schooling

Tap any trait to see other fish that share it.

03

Habitat & where to find it

Where the adult stage lives, and where its photos were taken.

  • Range · Indo-Pacific
  • Exact location · 5
  • Dive site · 1
  • Country only · 4
LIVES IN

Found in small schools, over sandy areas of outer lagoons and seaward reefs, rich in algae growth.

04

Adult photos 10

05

Discussion

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    ALL STAGES
    FOR THE MARINE-BIOLOGY CURIOUS

    Deep dive

    Taxonomy

    1. kingdomAnimalia
    2. phylumChordata
    3. classTeleostei
    4. orderAcanthuriformes
    5. familyAcanthuridae
    6. genusAcanthurus
    7. speciesAcanthurus blochii Valenciennes, 1835

    SourcesWoRMSFishBase

    06

    More in the family

    Surgeonfishes-Tangs-Unicornfishes (Acanthuridae)