Overview
The Threadfin Rainbowfish (Iriatherina werneri) is a intermediate freshwater species known for its silver-yellow, elaborate filament fins coloration. Delicate. Mid.
Origin & Appearance
Origin: Australia/Papua New Guinea.
Colors: Silver-Yellow, Elaborate filament fins.
Body Shape: Deep Fusiform (oval/robust). Typical adult dimensions: 5.0 x 1.0 x 2.0.
Sexual Dimorphism: Strong; males have elaborate filament fins.
Tank & Water Requirements
| Min Tank Size | 11 gallons |
| Temperature | 75–86°F |
| pH Range | 7–8 |
| Water Hardness (GH) | 8-15 |
| Bioload | very-high |
| Oxygen Demand | low |
| Plant Safe | yes |
| Aquarium Position | Mid |
Behavior & Activity
Delicate mid-water swimmer; males display elaborate filament fins in slow deliberate passes; gentle movement
Speed: 40/100Aggression: 2/10diurnalSchooling (6+)
Breeding
Moderate; egg scatterer among mops/plants
Common Diseases
💊 Ich
Expert Notes
Delicate; elaborate finnage on males