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Spotted Garden Eel

Heteroconger hassi

Family: Congridae | Genus: Heteroconger

Spotted Garden Eel (Heteroconger hassi)

Spotted Garden Eel

Heteroconger hassi

Family: Congridae | Genus: Heteroconger

Marine environments | Planktivorous | Indo-Pacific | Up to 40 cm | Up to 35 years

Garden eels are serpent-like fish that live in large colonies on sandy seabeds near coral reefs. They take their name from their distinctive behaviour of remaining partially buried in the sand, emerging only with the upper part of their bodies to feed on plankton drifting in the currents, creating the appearance of an underwater “garden”. They have prominent eyes, sharp curved teeth, and the ability to construct stable burrows in sandy substrates.

Geographical distribution

They inhabit Indo-Pacific waters, including the Red Sea and East Africa, extending to the Society Islands; northwards to the Ryukyu and Ogasawara Islands, and southwards to north-western Australia and New Caledonia; throughout Micronesia.

Anguila jardinera punteada
Heteroconger hassi en Poema del Mar
Anguila jardinera punteada en Poema del Mar

Icono de Anfibios Habitat

They are typically found in ecosystems characterised by:

  • Clean sandy bottoms near coral reefs
  • Areas with strong currents that carry plankton
  • Deep sand suitable for burrow construction
  • Tropical and subtropical waters with good visibility

Icono de Anfibios Lifestyle and behaviour

These eels display highly colonial and sedentary behaviour, remaining anchored in burrows that they excavate using their muscular bodies in sandy substrates.

Social behaviour:

  • Live in large colonies of up to 1,000 individuals

  • Clustered distribution in specific areas of deep sand

  • The male actively defends a chosen female from other individuals

Daily activity:

  • Remain partially buried in vertical burrows
  • Emerge with the upper body to capture plankton
  • Use their dorsal fin to move sand and keep the burrow clean

Reproduction:

  • During mating, males and females bring their burrows closer together

  • The male selects a mate and actively defends her from rival males

    Relationship with their environment:

      • Construct burrows by using body tension to drive their pointed tail into the seabed; the tail has a hardened tip to prevent injury

      • Stabilisation: they secrete a viscous substance through their skin that prevents burrow collapse

      Icono de Anfibios Diet

      In the wild

        • Planktivorous: feed on small planktonic animals drifting above them

        • Take advantage of strong currents carrying food

        Under human care

        • Feed on suspended plankton

        • Require feeding in two daily portions

        Icono de Anfibios Conservation status

        Estado de conservación preocupación menor anguila jardinera

        The spotted garden eel (Heteroconger hassi) is classified as Least Concern on the IUCN Red List. Its main threats include the degradation of sandy and reef habitats and the alteration of marine currents due to human activity.