Swan Galaxias
A tiny, scaleless freshwater fish found only in a handful of isolated headwater streams in eastern Tasmania, Australia, the Swan Galaxias survives where introduced trout cannot reach — above waterfalls and through marshes that act as natural barriers.
Rarely exceeding 13. 5 cm and commonly half that, it's not an angling target but a conservation subject: one of Australia's most at-risk native freshwater fish, listed as Endangered under both Tasmanian and Australian federal law.
Scientific Name: Galaxias fontanus
- Brownish-olive body with variable darker bars and blotches along the sides; belly silvery-white — coloration that blends into rocky, vegetated stream beds.
- Smooth, scaleless skin distinguishes it immediately from most other small freshwater fish; the slightly forked (emarginate) tail is another quick ID marker.
- Small even by galaxiid standards — commonly around 7 cm, with a maximum of roughly 13.5 cm and a top weight of about 8 grams.
- The only Tasmanian galaxiid that completes its entire life cycle in freshwater, never undergoing a marine larval stage.
What to know
Habitat Distribution
- Endemic to Tasmania, Australia — the entire known range is a small number of isolated headwater streams in the eastern part of the island.
- A spring-fed, moderately flowing shallow creek specialist; clean, cold water with stable flow is essential to its survival.
- Every remaining population exists in trout-free water, protected by natural barriers like waterfalls or marshes, or by man-made structures installed specifically for that purpose.
Specific Spots
- Rocky pools and runs with abundant aquatic and bankside vegetation, where the fish can shelter from current and find invertebrate prey.
- Woody debris and submerged structure serve as refuges for adults; juveniles school in more open water within the same stream reaches.
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