Fauna
Species

Spotted Garden Eel

Heteroconger hassi

Also known as Hass's Garden Eel, Spotted Heteroconger

Spotted garden eels live in dense colonies of hundreds of individuals on sandy reef slopes, anchoring their tails inside mucus-lined burrows while waving rhythmically into the current to snatch passing zooplankton. At the slightest sign of danger, an entire colony vanishes synchronously tail-first beneath the sand like a retracting field of seagrass. Mating pairs lean across neighboring burrows, intertwining their upper bodies while keeping their tails firmly anchored in their individual burrows.

MarineBurrowingPlanktivore
Spotted Garden Eel reference
(c) Natalie Lemanski, some rights reserved (CC BY-SA) · cc-by-sa
—observations
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Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Key facts
Diet & preyPelagic Copepods, Fish Larvae, Crustacean Zoea
Predators
  • Coral Trout
  • Titan Triggerfish
  • Banded Snake Eel
ThreatsAnchoring damage, marine sedimentation, habitat degradation from coral reef loss, and localized disruption by intense dive tourism.
HabitatsCurrent-swept sandy flats and slopes near coral reefs and lagoons at depths of 7–45 meters.
Life span10–15 years
Classification
  1. FamilyCongridae
  2. SpeciesHeteroconger hassi
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
Responsible observation
  • Approach slowly: Hover motionless slightly above the seabed so the colony does not retreat underground.
  • Check the current: Look for their heads facing directly into incoming flow where plankton drifts.
  • Avoid anchoring: Drop boat anchors only in designated moorings to avoid crushing eel colonies.
Related species
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