Common name: Dusky Garden Eel

Scientific name: Heteroconger enigmaticus Castle & Randall, 1999
The enigma garden eel (Heteroconger enigmaticus).  Picture was taken in the Banda sea, Ambon, West Papua, Indonesia

General information

The Spotted Garden Eel, Heteroconger enigmaticus, is a fascinating and unique addition to any large marine aquarium. These eels are known for their distinctive spotted patterns and slender bodies, which can reach up to 40 cm in length. They are a part of the Congridae family and are found in colonies in sandy substrates in the wild, where they feed on zooplankton passing by in the current.

Garden Eels are generally shy and reclusive, rarely venturing far from their burrows. They are interesting to observe as they sway with the current while partially buried in the sand.

Details

Recommended minimum tank volume
150 liter (40 gallons)
Salinity
S.G. 1.023 to 1.026
Temperature
22 to 26 °C (72 to 79 °F)
Acidity
pH 7.8 to 8.4
Average size
40 cm (1′4″)
Care level
Moderate to easy Prefers sandbeds for burrowing
Diet
Carnivore Enjoys mysis and brine shrimp
Social
Harem Best kept in groups, sandbed dwellers
Reefsafe
Yes
Aggression
Peaceful
Captive bred
No

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Chordates
    Chordata
  3. Class
    Ray-finned Fishes
    Actinopterygii
  4. Order
    Eels
    Anguilliformes
  5. Family
    Conger eels
    Congridae
  6. Genus
    Garden Eel
    Heteroconger
  7. Species
    Dusky Garden Eel
    Heteroconger enigmaticus Castle & Randall, 1999

Care

Spotted Garden Eels require a specialized aquarium setup to thrive in captivity. They need a deep sand bed for burrowing and a strong current to deliver food to them. It's essential to provide a peaceful environment as they can be easily outcompeted for food and are prone to stress.

Feeding can be challenging since they prefer live or frozen zooplankton, and ensuring food reaches them without being taken by other tank inhabitants is crucial.

Reproduction

In the wild, Spotted Garden Eels reproduce by broadcasting their eggs and sperm into the water column where fertilization occurs. In the aquarium, breeding is rare, but providing the right conditions can increase the chances of observing this behavior.

Habitat

Spotted Garden Eels are native to the Indo-Pacific region, where they inhabit sandy slopes and lagoons at depths ranging from 7 to 45 meters. They are often found in large groups, with each individual maintaining its own burrow.

In the aquarium, replicating their natural environment is key to their well-being, with a focus on sand bed depth and water flow.