Overview
The Black Skirt Tetra (Gymnocorymbus ternetzi) is a freshwater fish belonging to the family Characidae. It thrives at temperatures of 20–26 °C with a pH of 5.8–7.5, and requires a minimum tank volume of 80 litres. Known for its peaceful community fish; occasional fin nipper, it is considered a beginner-level species. Fades from black to grey with age; long-finned varieties are especially popular but prone to nipping. Water changes of 25–30 % weekly, stable parameters, and appropriate tank mates are key to long-term success with this species.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Characidae |
| Genus | Gymnocorymbus |
| Species | Gymnocorymbus ternetzi |
| Water type | freshwater |
| Native range | Neotropical |
Natural Habitat
Gymnocorymbus ternetzi originates from Neotropical. It inhabits freshwater environments and is adapted to the water conditions found in its native range.
Appearance
Adults reach 5–7 cm in length. The body is freshwater and the species displays characteristic coloration suited to its environment.
Behavior
This species is described as a peaceful community fish; occasional fin nipper. It naturally schools and should be kept in groups of 6 or more. Activity level is moderate. Fades from black to grey with age; long-finned varieties are especially popular but prone to nipping.
| Trait | Value |
|---|---|
| Temperament | peaceful community fish; occasional fin nipper |
| Schooling | Yes |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 20–26°C (68–79°F) | Use a reliable adjustable heater |
| pH | 5.8–7.5 | Avoid sudden swings |
| Hardness (GH) | 4–18 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 80L (21 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- The striking black posterior half of the body and large dark fins inspired the name 'Black Skirt'.
- A naturally occurring colour mutation has produced the albino and 'White Skirt' variety.
- Long-finned specimens are line-bred and do not represent a wild form.
📋 Full Care Guide
Ready to set up a tank for your Black Skirt Tetra? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Black Skirt Tetra Care Guide →Related Species
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This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.