Overview
The Zebrafish (Danio rerio) is a freshwater fish belonging to the family Cyprinidae. It thrives at temperatures of 18–26 °C with a pH of 6.5–7.5, and requires a minimum tank volume of 60 litres. Known for its very peaceful, highly active schooling fish, it is considered a beginner-level species. Hardy and fast-moving; one of the most resilient aquarium fish; tolerates a wide range of conditions. 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 | Cyprinidae |
| Genus | Danio |
| Species | Danio rerio |
| Water type | freshwater |
| Native range | Martinique|North America|Oceania|Oriental (Indomalaya)|Palaearctic |
Natural Habitat
Danio rerio originates from Martinique|North America|Oceania|Oriental (Indomalaya)|Palaearctic. It inhabits freshwater environments and is adapted to the water conditions found in its native range.
Appearance
Adults reach 4–5 cm in length. The body is freshwater and the species displays characteristic coloration suited to its environment.
Behavior
This species is described as a very peaceful, highly active schooling fish. It naturally schools and should be kept in groups of 6 or more. Activity level is high. Hardy and fast-moving; one of the most resilient aquarium fish; tolerates a wide range of conditions.
| Trait | Value |
|---|---|
| Temperament | very peaceful, highly active schooling fish |
| Schooling | Yes |
| Activity level | high |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 18–26°C (64–79°F) | Use a reliable adjustable heater |
| pH | 6.5–7.5 | Avoid sudden swings |
| Hardness (GH) | 5–20 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 | 60L (16 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Zebrafish are the most important vertebrate model organism in biological and genetics research.
- Zebrafish embryos are transparent, allowing scientists to observe organ development in real time.
- They can regenerate heart muscle tissue after injury — a property being studied for human medicine.
📋 Full Care Guide
Ready to set up a tank for your Zebrafish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Zebrafish Care Guide →Related Species
Related Species & Guides
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.