They are commonly known as the 'Threadfin' or 'Featherfin' Rainbowfish. In Australia the 'Standard Names of Australian Fishes' published by the CSIRO lists them as 'Threadfin Rainbowfish'.

Iriatherina werneri may grow to a maximum size of 5 cm, but are more commonly seen at around 3-4 cm.

requires a tank of at least 20 gallons. Maintain the water temperature between 75-82°F (24-28°C) with a pH level of 6.0-7.5. Provide them with a well-planted tank and open swimming space. They are omnivorous, so feed them a varied diet of high-quality flakes, small pellets, and small live or frozen foods. Keep them in groups of 6 or more for optimal social behavior. Regular water changes and monitoring of water parameters are important for their well-being.