Depth
Zeugopterus · Bony Fish

Eckström's Topknot

Zeugopterus regius

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 Zeugopterus
Species regius

Bony Fish

Identification & Biology

  • IdentificationSmall, oval flatfish with both eyes on the left side. Dark brown with irregular blotching and a fringe of short tentacle-like processes around the head margin. Rough, ctenoid scales.
  • SizeUp to 20 cm total length, commonly 8 to 12 cm.
  • Social HabitSolitary and strictly bottom-dwelling. Lies flat on the substrate, relying entirely on camouflage.
  • HabitatRocky bottoms and coarse substrates, often attached to the underside of rocks and boulders. Unlike most flatfish, prefers hard substrates over sand.
  • Depth10 to 200 m, most common between 20 and 80 m.
  • Feeds OnSmall crustaceans and worms found on rocky surfaces.
  • DistributionEastern Atlantic from the British Isles to Morocco, including the Mediterranean Sea.
  • DescriptionAn unusual flatfish that attaches itself to the underside of rocks and boulders rather than lying on sandy bottoms like most flatfish. Its rough scales help it cling to vertical and overhanging surfaces. Divers occasionally find one when looking under boulders.

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.

Eckström's Topknot species card

Biology

Behaviour & Diet

Feeding Strategy

Feeds on tiny benthic invertebrates and organic particles on rock surfaces. Forages at night on the hard substrates it clings to.

Micro-predator

Reproduction

Spawns small pelagic eggs in spring and summer. Very little is known about its reproductive behaviour due to its cryptic lifestyle.

Egg layer

Behaviour & Defence

Its flattened, mottled body is almost invisible against rocky surfaces. Can cling firmly to vertical walls and overhangs where predators are less likely to search.

Camouflage

Dive with diveshack

Where to Encounter in Malta

The following dive sites offer strong habitat match for Zeugopterus regius. 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.

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5-50m
Gozo

Blue Hole

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

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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