Threadfin Rainbowfish (Iriatherina werneri)

Fish in the family Melanotaeniidae. Moderate care. Freshwater.

Quick facts

Scientific nameIriatherina werneri

FamilyMelanotaeniidae

Also known asFeatherfin Rainbowfish, Werner's Rainbowfish

Care levelModerate

Reef safetyFreshwater

TemperamentPeaceful (active)

DietOmnivore

Adult size1.8 in

Minimum tank size15 gallons

Water parametersTemp 75-86°F, pH 5.5-7.5, GH 3-12 dGH

Appearance

Small elongate fish with spectacular extended threadlike dorsal and anal fin rays; males display vivid red, black, and yellow finnage during courtship.

Difficulty and care for the Threadfin Rainbowfish

Moderate

Origin and habitat

Australia / New Guinea (slow vegetated streams and swamps)

Keeper notes

Extremely peaceful and slow-feeding; easily outcompeted by fast or boisterous tankmates. Tiny mouth needs small foods. Best in a calm, well-planted tank.

Log Threadfin Rainbowfish in your reef tank

Reef Trak gives you the full record on every species in your tank: acquisition date, source, photos, parameters at time of stocking, and links to maintenance and feeding events. Track Threadfin Rainbowfish alongside everything else in your reef.

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