Depth
Epinephelus · Bony Fish

Dusky Grouper

Epinephelus marginatus

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
High
Sighting Likelihood
Kingdom Animalia
Phylum Chordata
Class Actinopterygii
Genus Epinephelus
Species marginatus

Bony Fish

Identification & Biology

  • IdentificationLarge, heavy-bodied grouper with a massive head and wide, powerful jaws. Dark olive-brown to grey-green body with irregular pale yellowish blotches. Large, prominent eyes. Rounded tail.
  • SizeUp to 150 cm total length and 60 kg, commonly 40 to 80 cm.
  • Social HabitSolitary and strongly territorial. Adults defend home caves and territories against intruders. Remarkably curious toward divers.
  • HabitatRocky reefs, wrecks, caves, and boulder fields. Strongly associated with caves and overhangs used as daytime resting sites.
  • Depth5 to 300 m, most common between 10 and 60 m.
  • Feeds OnFish, cephalopods, and crustaceans. A sit-and-ambush predator that strikes from the shadows of its cave.
  • DistributionEastern Atlantic from the Bay of Biscay to South Africa, including the entire Mediterranean Sea.
  • DescriptionThe iconic Mediterranean grouper and one of the most memorable encounters a diver can have. Large, mature dusky groupers are remarkably docile and curious, often approaching divers with an almost dog-like inquisitiveness. Historically overfished, populations are recovering in marine protected areas. They can live for over 50 years and are protogynous hermaphrodites.

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.

Dusky Grouper species card

Biology

Behaviour & Diet

Feeding Strategy

An ambush predator that feeds on fish, octopus and crustaceans. Waits motionless near rocky overhangs before engulfing prey with a rapid suction strike.

Ambush predator

Reproduction

A protogynous hermaphrodite that transitions from female to male around age 12. Spawns in summer at established sites, with males guarding territories.

Hermaphrodite

Behaviour & Defence

Retreats deep into its home cave or crevice when threatened. Adults are large enough to have few natural predators in the Mediterranean.

Cave dweller

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Epinephelus marginatus. 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