Depth
Tripterygion · Bony Fish

Red-black triplefin

Tripterygion tripteronotum

0-40m
Depth Range
Variable
Max Size
Mediterranean
Distribution
0-40m
Depth Range
Variable
Max Size
Reef & Open
Habitat
Carnivore
Diet
Solitary
Social
LC
IUCN Status
Kingdom Animalia
Phylum Chordata
Class Actinopterygii
Genus Tripterygion
Species tripteronotum

Bony Fish

Identification & Biology

  • IdentificationTiny triplefin blenny with three separate dorsal fins. Males become jet black with a bright red head during breeding. Females and non-breeding males are brownish with reddish tones.
  • SizeUp to 8 cm total length, commonly 4 to 6 cm.
  • Social HabitSolitary and territorial. Males defend small patches of vertical rock face and court females with displays.
  • HabitatRocky reefs, walls, and boulders. Prefers shaded vertical surfaces with coralline algae.
  • Depth3 to 40 m, most common between 5 and 25 m.
  • Feeds OnTiny invertebrates including copepods and amphipods picked from rock surfaces.
  • DistributionMediterranean Sea. An endemic species.
  • DescriptionBreeding males are among the most visually striking small fish on the Mediterranean reef, with a vivid red head contrasting against a jet-black body. Outside breeding season, they are cryptic and easily overlooked. One of three triplefin species in the Mediterranean, all of which are small and rock-dwelling.

Range

Habitat & Distribution

Found across the Mediterranean, inhabiting reef & open environments. Active from the surface down to 40m depth.

Where Malta divers have spotted this species

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Sightings are logged by divers using our What Did You See? dive-log tool. View the full live sightings map.

Detail

Preferred Environment

Reef & Open habitats, typically at depths of 0-40m. Most commonly encountered by divers at the shallower end of its range.

Encounter Tips

Best approached slowly and calmly. Avoid casting shadows directly over the animal. Neutral buoyancy and patience increase encounter success significantly.

Red-black triplefin species card

Biology

Behaviour & Diet

Feeding Strategy

Feeds on minute invertebrates and copepods picked from rock surfaces, using precise, darting strikes.

Micro predator

Reproduction

Males guard clutches of adhesive eggs laid on rock surfaces. Breeding males develop intensified dark and red colouration.

Egg guarder

Behaviour & Defence

Tiny size and cryptic colouration make it extremely difficult to spot against rocky substrates covered in algal film.

Camouflage

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Tripterygion tripteronotum. All are accessible on a guided dive with diveshack.

5-30m
North Malta

Cirkewwa

Rocky reef with caves, arches and ledges hosting a rich diversity of reef species.

View dive site ›
5-50m
Gozo

Blue Hole

One of the Med's most famous reef dive sites. Rocky walls and archways covered in life.

View dive site ›
18-36m
South Malta

Um El Faroud

The wreck lies on a sandy bottom surrounded by rocky reef -- a diverse habitat attracting reef species.

View dive site ›
IUCN Red List Least Concern

Conservation Status

This species is assessed as Least Concern on the IUCN Red List. Mediterranean populations face ongoing pressure from fishing activity, habitat degradation, and climate-driven changes to prey availability.

Source: iNaturalist Guide #888
by Lesley Clements (CC BY-SA)
diveshack Mediterranean Marine Life guide