Lake Wanam Rainbowfish Identification Guide
Recognize this Papua New Guinea lake endemic by its deep body and males' rich purplish-red coloration.
Read the full Lake Wanam Rainbowfish encyclopedia entry →
Key identification features
- Deep, laterally compressed body reaching about 4-5 inches (10-13 cm)
- Mature males show a rich purplish-red to reddish-orange body tone; females are yellow-olive to silvery
- Moderately arched back, less pronounced than in the closely related Red Rainbowfish
- Two dorsal fins set close together and a forked tail tinted in the body's red-purple tone
- Small head and eyes relative to body depth
- Scale edges often show a faint darker outline that adds subtle texture to the overall color
Common look-alikes
- Red Rainbowfish: close relative with a more strongly humped back and a warmer orange-red tone rather than purplish-red
- Turquoise Rainbowfish: blue rather than red-toned coloration
- Banded Rainbowfish: shows distinct stripes instead of an even overall color wash
Where you'll see one
Endemic to Lake Wanam near Lae in Papua New Guinea, restricted to this single lake system and its immediate tributaries. It schools over open water close to fringing shoreline vegetation, rarely straying far from the lake's shallow margins.
Frequently asked questions
How do I tell a Lake Wanam Rainbowfish from a Red Rainbowfish?
Lake Wanam males lean toward purplish-red with a gentler body curve, while Red Rainbowfish males are more orange-red with a pronounced humped back.
What is the most reliable identifier for this species?
Its extremely limited native range in Lake Wanam combined with a deep, purplish-red male coloration.