Threadfin Rainbowfish (Iriatherina werneri)
A small, peaceful freshwater fish prized by aquarists for its unique, delicate finnage and lively, dancing movements. Native to slow-moving waters in northern Australia and New Guinea, these fish are an excellent addition to a well-established community tank.
Males are known for their exceptionally long, thread-like dorsal and anal fins. Their bodies are typically light, translucent with hints of yellow, blue, and green. The vibrant coloration and flowing fins make them a visually striking choice for any aquarium.
| Feature | Detail |
|---|---|
| Species | Iriatherina werneri |
| Size | Up to 2.5 inches (6 cm) |
| Temperament | Peaceful |
| Water Type | Freshwater |
| Hardiness | Easy to care for |
FAQ
What is the ideal tank size for Threadfin Rainbowfish?
Threadfin Rainbowfish thrive in a community tank of at least 20 gallons. They require ample space to swim and display their full finnage.
Are Threadfin Rainbowfish suitable for beginners?
Yes, they are peaceful and easy to care for, making them a good choice for beginner aquarists who want a visually appealing fish.
Do males and females differ in appearance?
Yes, males have longer, more elaborate dorsal and anal fins and are more colorful, especially in yellow, blue, and green tones. Females are smaller and less vibrant.
Ian Anderson –
The Threadfin Rainbowfish are beautiful and active. They add a lot of movement to the tank. The colors are vibrant and the fins move gracefully. I’ve had them for three months and they’re still healthy and active.
Michael Powell –
Great fish for a community tank. They don’t stress other fish and are easy to maintain. The translucent body with blue and yellow highlights is very eye-catching.
Phil Payne –
Arrived quickly and the fish were healthy. They settled into the tank within a week. The males really stand out with their long fins. I’m happy with the purchase.