Red Rainbowfish Identification Guide
Identify this Papuan lake species by its deep, arched body and males' overall fiery red-orange coloration.
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Key identification features
- Deep, strongly compressed body with a pronounced arch in the back, especially in mature males
- Adult males are almost entirely bright red to orange-red; females are olive-yellow to silvery with only a faint pink tint
- Small head and eyes relative to body depth, emphasizing the deep body shape
- Two dorsal fins set close together and a forked tail, both washed in the body's red tone
- Reaches around 4-5 inches (10-13 cm)
- Scales often show a fine darker outline, giving a subtly reticulated pattern on close inspection
Common look-alikes
- Turquoise Rainbowfish: blue rather than red coloration and a straighter back profile
- Lake Wanam Rainbowfish: similarly deep-bodied and red-toned, but leans more purplish-red with a less humped nape
- Banded Rainbowfish: shows distinct stripes rather than an even overall red wash
Where you'll see one
Endemic to Lake Sentani and its inflowing streams in Papua, Indonesia, schooling over open water near vegetation. It is typically found near the lake's shallow, plant-fringed margins rather than deep open water.
Frequently asked questions
How do I tell a Red Rainbowfish from a Lake Wanam Rainbowfish?
Red Rainbowfish males are more orange-red with a pronounced humped back, while Lake Wanam males lean more purplish-red with a gentler body curve.
What is the clearest sign I'm looking at a Red Rainbowfish?
An adult male with an almost solid red-orange body and a noticeably arched, deep profile is the strongest indicator.