Fauna
Species

Short-finned Eel

Anguilla australis

Also known as Shortfin Eel, Silver Eel, Freshwater Eel

Short-finned eels are catadromous wanderers that spend decades maturing in calm freshwater rivers, wetlands, and farm dams across the southwestern Pacific. At sexual maturity, adults transform into sleek silver eels, ceasing feeding entirely as they embark on an arduous oceanic journey of thousands of kilometers to deep tropical spawning trenches. Along the way, they can slither across damp meadows and muddy banks on dewy nights, exploiting overland routes to colonize landlocked water bodies.

MigratoryNocturnalFreshwater
Short-finned Eel reference1 / 7
(c) Joe Potter Butler, some rights reserved (CC BY), uploaded by Joe Potter Butler · cc-by
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Near ThreatenedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNear ThreatenedRed List categories, explained →
Key facts
Diet & preyCommon Galaxias, Freshwater Crayfish, Chironomid Midges
Predators
  • White-bellied Sea-Eagle
  • Australasian Bittern
  • Australian Fur Seal
ThreatsMigration barriers from dams, wetland drainage, water diversion, and commercial harvest
HabitatsLakes, farm dams, swamps, coastal streams, and brackish estuaries
Life span15–30 years
Classification
  1. FamilyAnguillidae
  2. SpeciesAnguilla australis
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.
What to notice
Look for a uniform olive-green to bronze body with the dorsal fin beginning only slightly forward of the anal fin.
Support conservation
Do not obstruct downstream migration pathways or disturb congregating silver eels during seasonal flood events.
Responsible observation
  • Night Spotting: Sweep a red-filtered flashlight slowly along muddy shallows after dusk to spot actively foraging adults.
  • Barrier Viewing: Watch spillways and fish ladders in autumn, when mature silver eels gather before heading out to sea.
Related species
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