Threadfin Rainbowfish – Iriantherina werneri

The Threadfin Rainbowfish is a delicate and elegant freshwater species admired for its long, flowing fins and iridescent coloration. This peaceful fish thrives in well-maintained aquariums with calm tankmates and soft, planted environments.

Description:

Common Name: Threadfin Rainbowfish

Scientific Name: Iriatherina werneri

Family: Melanotaeniidae

Size: 1.5-2 inches (4-5 cm)

Temperament: Peaceful and social.

Difficulty: Moderate

Native Region:

Found in slow-moving rivers, swamps, and floodplains of northern Australia and New Guinea, where it prefers densely planted areas with calm waters.

Aquarium Setup:

Tank Size: Minimum of 10 gallons

Temperature: 75-82F (24-28C)

pH: 5.5-7.5

Hardness: Soft to moderately hard water

Substrate: Fine gravel or sand with dense plants and open swimming areas.

Additional Tips:

Social Behavior: Best kept in groups of six or more to encourage natural schooling behavior and reduce stress.

Compatibility: Ideal tankmates include small, peaceful species like rasboras, tetras, and Corydoras. Avoid aggressive or fin-nipping fish.

Diet: Omnivorous; provide a mix of high-quality micro pellets, flakes, and occasional live or frozen foods like daphnia and baby brine shrimp.