Overview
The Blue Danio, also known as the Kerri Danio, is a popular freshwater fish known for its vibrant blue color and peaceful nature. It is a great addition to community tanks and is suitable for beginners. These fish are active and enjoy swimming in groups, though they do not school. They require a well-maintained tank with a temperature range of 22-28°C and a pH level between 6.0 and 8.0.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Cyprinidae |
| Genus | Danio |
| Species | Danio kerri |
| Water type | freshwater |
Natural Habitat
Native to the Mekong River in Laos, the Blue Danio thrives in slow-moving, warm waters with dense vegetation.
Appearance
The Blue Danio has a slender body with iridescent blue scales and a silver sheen along its sides. It has a distinctive forked tail and a long, flowing dorsal fin.
Behavior
Blue Danios are generally peaceful and can be kept with a variety of tankmates. However, they may exhibit nipping behavior towards tankmates, especially during breeding season. They are active swimmers and enjoy the company of other fish.
| Trait | Value |
|---|---|
| Temperament | peaceful community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–28°C (72–82°F) | Use a reliable adjustable heater |
| pH | 6–8 | Avoid sudden swings |
| Hardness (GH) | 5-15 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 | 20L (5 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Blue Danios are one of the most commonly bred aquarium fish.
- They are known for their ability to change color based on their mood and environment.
- The species is an important food source for many local communities in its native range.
📋 Full Care Guide
Ready to set up a tank for your Blue Danio? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Blue Danio 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.