Murray River Rainbowfish Identification Guide
Key features for identifying the Murray River Rainbowfish, endemic to the Murray-Darling basin of southeastern Australia.
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Key identification features
- Moderately deep, laterally compressed body
- Silvery-olive to pale blue body with a faint but continuous dark midlateral stripe
- Fins can show pale yellow to orange tones, more saturated in males
- Two dorsal fins, with the second dorsal and anal fins slightly pointed in males
- Visibly reticulated scale pattern along the back
- Small, terminal mouth suited to picking food from the water column
- Rounded, fan-shaped caudal fin
- Typically 7-10 cm
Common look-alikes
- Crimson-spotted rainbowfish: shows red spotting on the flanks that this species lacks, and occupies a different, coastal river system.
- Desert rainbowfish: overall paler, sandier coloration and restricted to central Australian desert drainages.
- Carp gudgeon: an unrelated small native fish with a single dorsal fin and a much smaller, rounder body shape.
Where you'll see one
Found throughout the Murray-Darling river system of southeastern Australia, favoring slow pools, backwaters, and vegetated stream margins, frequently schooling with other small natives around snags and aquatic plant beds along low, gently sloping banks.
Frequently asked questions
How can I be sure I've found a Murray River rainbowfish and not a crimson-spotted rainbowfish?
Check the flanks: Murray River rainbowfish lack the rows of red spots seen on mature crimson-spotted rainbowfish, and the two species occupy separate river drainages.
What fin arrangement confirms it's a rainbowfish?
Look for two distinct, separate dorsal fins; single-dorsal-fin natives sharing the same habitat, like gudgeons, are not rainbowfish.