WHATSTHATFISH
Bony fish

Piano Fangblenny

Plagiotremus tapeinosoma

Also known as: Fang Blenny, Hit-and-Run Blenny, Hit-and-Run Fangblenny, Mimic Blenny, Piano Blenny, Sabretooth Blenny, Sabre-toothed Blenny, Scale-eating Blenny, Scale-eating Fangblenny, Scale-eating Sabretooth Fangblenny, Slender Blenny, Violet-banded Blenny, Yellow Sabretooth Blenny

LCLeast ConcernIUCN Red List, 2026
Adult
@markn · Jenny's Beach House Rarotonga, Cook Islands · June 20151 / 17
01

Overview

Found singly with just their heads showing, in abandoned worm holes, or roaming close to their holes, looking for victims to attack, and then diving into their holes for protection, over surge zones, of lagoons and seaward reefs. They mimic other fish, often changing their colour to get close to passing fish, and then attack biting off small pieces of mucus, scales and tissue. They will also nip divers.
The feed on mucus, scales, and tissue.

Combtooth Blennies are the largest family of blennies, found in both tropical and subtropical waters and freshwater habitats, as the name suggests they have comb like teeth lining their jaws, well suited for scraping food off hard surfaces!
Sabretooth Blennies have teeth to match their name!
They can be seen darting forward to sever flesh from fishes fins. (can sometimes be seen taking a swipe at divers as well) They will then dart back into their holes out of harm's way.
Some blennies will mimic cleaner wrasses to get close enough for a nip at fish.
A few Sabretooth Blennies are venomous.

02

How to identify

Tap any trait to see other fish that share it.

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Habitat & where to find it

  • Range · Indo-Pacific
  • Exact location · 1
  • Country only · 16
LIVES IN

Found singly with just their heads showing, in abandoned worm holes, or roaming close to their holes, looking for victims to attack, and then diving into their holes for protection, over surge zones, of lagoons and seaward reefs.

04

Adult photos 17

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Discussion

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    ALL STAGES
    FOR THE MARINE-BIOLOGY CURIOUS

    Deep dive

    Taxonomy

    1. kingdomAnimalia
    2. phylumChordata
    3. classTeleostei
    4. orderBlenniiformes
    5. familyBlenniidae
    6. genusPlagiotremus
    7. speciesPlagiotremus tapeinosoma (Bleeker, 1857)

    SourcesWoRMSFishBase

    06

    More in the family

    Combtooth Blennies (Blenniidae)