Featherfin Tetra - Hemigrammus unilineatus Fish Profile & Care Guide
Introduction
The Featherfin Tetra (Hemigrammus unilineatus), a unique freshwater species native to Central and South America, is a rare gem in the aquarium trade. Its social and peaceful nature, thriving in groups and coexisting well with other community fish, makes it a fascinating addition to any well-maintained community aquarium.
The Featherfin Tetra, with its assertive shoaling behaviour, is a peaceful and non-aggressive species. It thrives in groups of six or more, where individuals swim closely together in coordinated movements. This highly social nature makes it an excellent addition to a well-balanced community aquarium, reassuring you of its compatibility with other fish species.
When choosing tankmates for your Featherfin Tetras, it's crucial to consider species with similar temperaments and environmental preferences. Opt for other small, peaceful fish like Neon Tetras, Harlequin Rasboras, and Corydoras Catfish. Avoid larger, aggressive species that might intimidate or prey upon these Tetras, as this could disrupt the harmony of your aquarium.
To ensure the health and colouration of your Featherfin Tetras, it's essential to maintain stable water parameters and perform regular water changes. These adaptable fish prefer soft to moderately hard water and a well-planted aquarium with ample hiding spots. By replicating their natural habitat and maintaining these conditions, you can ensure the well-being of your Tetras.
The Featherfin Tetra features an oval-shaped, slightly translucent silver body with subtle pinkish-red hues. Its fins are mostly transparent, except for the anal and dorsal fins, which are adorned with a distinctive black stripe accented by a striking white line at the front.
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Sexual Dimorphism
Sexing Featherfin Tetras can be determined by observing the swim bladder, which is visible through their semi-translucent skin. In males, the swim bladder tapers to a distinct point, whereas in females, it appears more rounded. Additionally, adult females are typically slightly larger and exhibit a fuller body shape compared to their male counterparts.
Quick Facts
| Scientific Name | Hemigrammus unilineatus |
|---|---|
| Year Described | 1858 |
| Other Names | Crystal Tetra |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Characidae |
| Genus | Hemigrammus |
| Origins | Trinidad and Tobago Venezuela Guyana Suriname French Guiana |
| Approx Max Size | 5 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 5.5 - 7.5 |
| GH | 1 - 20 |
| ℉ | 74 - 82 |
|---|---|
| ℃ | 23 - 28 |
Natural Habitat
The Featherfin Tetra is native to Central and South America, inhabiting various river systems across Trinidad, Venezuela, Guyana, Suriname, French Guiana, and the Amazon and Guaporé River Basins. This species thrives in diverse freshwater environments, including ponds, ditches, and slow-moving streams, which can be found in clear and turbid waters. It adapts to various conditions, frequently occupying both open and shaded areas within its natural habitat.
Breeding
The Featherfin Tetra is noted for its ease of breeding in captivity. This species is an open-water egg scatterer, engaging in external fertilization without exhibiting parental care post-spawning. ? To encourage breeding, it is advisable to maintain the aquarium at a temperature around 76°F (24°C). Providing fine-leaved plants or spawning mops can offer suitable sites for egg deposition.
After spawning, it is recommended that adult fish be removed to prevent predation on the eggs. The eggs typically hatch within 24 to 36 hours, and the fry become free-swimming shortly thereafter. Feeding the fry with infusoria or commercially available liquid fry food during its initial stages supports healthy development.?
In the wild, Featherfin Tetras tend to breed during certain times of the year. Observations suggest that mature adults and juveniles increase during specific seasons, indicating that environmental changes, such as temperature or water conditions, may influence their breeding cycles. Understanding these natural breeding behaviours can assist aquarists in replicating optimal conditions in captivity, thereby promoting successful spawning and rearing of Hemigrammus unilineatus.
Diet & Feeding
?Featherfin Tetras are voracious feeders, and their diet primarily consists of small crustaceans, insects, and molluscs in their natural habitats. In aquarium settings, they readily accept a variety of foods, including high-quality flake foods, micro-pellets, and live or frozen options such as brine shrimp and daphnia. Providing a diverse diet ensures they receive essential nutrients, promoting optimal health and colouration. Feeding once or twice daily in amounts they can consume within a few minutes is recommended to prevent overfeeding and maintain water quality.
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Published: 07 Mar 2025
Last Updated: 07 Mar 2025