Depth
Tripterygion · Bony Fish

Black-faced blenny

Tripterygion delaisi

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 delaisi

Bony Fish

Identification & Biology

  • IdentificationTiny triplefin blenny with three separate dorsal fins. Males develop a striking black head with bright yellow or white body during breeding season. Females and non-breeding males are brownish-red.
  • SizeUp to 9 cm total length, commonly 4 to 6 cm.
  • Social HabitSolitary and territorial. Males defend small territories on vertical rock faces and perform elaborate courtship displays.
  • HabitatRocky reefs, walls, and boulders with coralline algae cover. Prefers shaded areas such as overhangs and cave entrances.
  • Depth3 to 45 m, most common between 5 and 30 m.
  • Feeds OnTiny invertebrates including copepods and amphipods picked from rock surfaces.
  • DistributionEastern Atlantic from the British Isles to West Africa, including the entire Mediterranean Sea.
  • DescriptionOne of the Mediterranean's most striking small fish during breeding season, when males develop a jet-black face and vibrant yellow body. Outside breeding season they are plain and easily overlooked. A favourite subject for macro photographers who know where to look.

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.

Black-faced blenny species card

Biology

Behaviour & Diet

Feeding Strategy

Grazes on algae, small crustaceans and detritus scraped from rocky surfaces. Feeds in short, darting movements close to its home crevice.

Omnivore

Reproduction

Males guard eggs deposited inside empty shells or rock crevices. They fan the eggs to keep them oxygenated until hatching.

Nest guarder

Behaviour & Defence

Retreats into narrow rock crevices too tight for most predators to follow. Its dark facial colouration may serve as intraspecific territorial signalling.

Crevice dweller

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Tripterygion delaisi. 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