Barilius / Giant Danio / Malabar Danio

Barilius is a genus of freshwater fish belonging to the family Cyprinidae, commonly found in rivers and streams of South Asia, particularly in countries like India, Nepal, and Bangladesh.

These fish are known for their elongated bodies, silver or bluish coloration, and dark vertical stripes or spots. They are active swimmers and are often found in fast-flowing waters.

Barilius species are popular among aquarists due to their attractive appearance and lively behavior. In the wild, they feed on insects, small invertebrates, and plant matter.

They prefer well-oxygenated water and thrive in habitats with rocky or sandy substrates.

Barilius fish are active swimmers and can grow to a decent size (around 4-6 inches), so a tank of at least 30 gallons is recommended.

These fish are native to fast-flowing rivers, so it’s important to replicate this in the aquarium. You can use a strong filter or powerhead to create water movement.

Use a substrate of sand or fine gravel, and provide plenty of hiding spots using rocks, driftwood, and plants. Make sure the decorations don’t obstruct the water flow.

Moderate lighting is ideal, and you can use live plants that thrive in such conditions.

Keep the water temperature between 68-75°F (20-24°C).

A neutral pH of around 6.5-7.5 is ideal.

They prefer slightly soft to moderately hard water.

Barilius fish are omnivorous, so their diet should include a mix of high-quality flake or pellet food, along with live or frozen foods like bloodworms, brine shrimp, and daphnia.

You can also supplement their diet with some plant matter or algae-based food.

These fish can be somewhat territorial, especially in smaller tanks, so choose tank mates carefully.

They generally do well with other fast-moving fish like danios, rasboras, or loaches.

Avoid slow-moving or long-finned fish, as Barilius may nip at them.

Barilius are active and can be jumpy, so ensure the tank has a secure lid to prevent escapes.

They are best kept in groups of 5 or more to reduce aggression and promote natural behavior.

With proper care and the right environment, Barilius fish can make a lively and attractive addition to a home aquarium.