Flathead Galaxias
A small, shoaling native fish of southeastern Australia's lowland waterways, the Flathead Galaxias is more often encountered in conservation surveys than on the end of a line.
Its distinctly flattened head and tolerance for slow, oxygen-poor water make it a specialist of billabongs, wetlands, and sluggish backwaters — and a useful indicator of river system health.
Scientific Name: Galaxias rostratus
Also known as Flat-headed galaxias, Murray jollytail
- The flattened head is the defining feature — noticeably depressed compared to other galaxiids, with a large mouth whose gape extends well below the eye.
- Olive-green on the back and sides with irregular dark blotches; silvery below the lateral line; fins mostly clear.
- The anal fin originates almost directly below the dorsal fin — a key distinction from the similar Obscure Galaxias, where the anal fin sits noticeably further back.
- A small species, rarely exceeding 100 mm in length, with small, non-fleshy pectoral and pelvic fins.
What to know
Habitat Distribution
- Native to the Murray-Darling river system in southeastern Australia, with historical records from major tributaries including the Lachlan, Murrumbidgee, Goulburn, and Ovens Rivers; now considered extinct in its South Australian range.
- A lowland specialist: still or slow-moving waters — billabongs, lakes, swamps, wetlands, and sluggish stream margins — are its core habitat, not fast-flowing upland streams.
- A related but distinct undescribed taxon, the Southern Flathead Galaxias, occupies gravelly Southland river sections in New Zealand and carries its own conservation status there.
Specific Spots
- Midwater over rock or sand bottoms is where shoals typically suspend — not tight to the substrate, but not surface-oriented under normal conditions either.
- Stream margins with aquatic vegetation provide cover and concentrate the invertebrate prey this species depends on.
- When dissolved oxygen drops in warm, stagnant water, fish move to the surface to exploit the oxygen-rich boundary layer — a behavioral tell that can reveal their presence in otherwise featureless backwaters.
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