Giant Danio (Devario aequipinnatus)
The Giant Danio is a vibrant, fast-swimming freshwater fish popular in the aquarium trade. It is larger than other danio species and thrives in well-oxygenated waters with plenty of space to swim.
General Information
- Scientific Name: Devario aequipinnatus
- Family: Cyprinidae (carp and minnows)
- Common Names: Giant Danio
- Native Range: South and Southeast Asia, particularly India, Nepal, Sri Lanka, Bangladesh, and Myanmar
- Habitat: Fast-moving rivers, streams, and hill streams with clear, oxygen-rich water
Physical Characteristics
- Size: Can grow up to 4–6 inches (10–15 cm) in length
- Lifespan: Typically 5–7 years with proper care
- Appearance:
- Slender, elongated body
- Iridescent blue and gold markings along the body
- Forked tail and long, flowing fins
Behavior & Temperament
- Highly active swimmers that require open space
- Schooling fish – should be kept in groups of at least 5 or more to reduce stress
- Generally peaceful, but their fast movements can stress smaller or slower-moving fish
- Can sometimes be fin nippers, so avoid slow or long-finned tank mates
Diet & Feeding Habits
- Diet Type: Omnivorous
- Food in the Wild: Insects, zooplankton, algae, and small crustaceans
- Food in Captivity:
- High-quality flakes or pellets
- Live or frozen foods (bloodworms, brine shrimp, daphnia)
- Vegetable matter (blanched spinach, peas)
A varied diet enhances their coloration and overall health.
Aquarium Requirements
- Tank Size: At least 30 gallons (larger for bigger schools)
- Water Parameters:
- Temperature: 22–27°C (72–81°F)
- pH: 6.5–7.5
- Hardness: 5–15 dGH
- Tank Setup:
- Strong filtration with good water flow to mimic their natural habitat
- Open swimming areas with some plants and driftwood for cover
- Secure lid (they are known jumpers!)
Tank Mates & Compatibility
- Best with similarly fast-moving and peaceful species, such as:
- Other large danios or barbs
- Rainbowfish
- Gouramis (larger species like Pearl or Blue Gouramis)
- Larger tetras (like Congo Tetras)
- Loaches or catfish (Corydoras, Plecos)
Avoid slow-moving or delicate fish (e.g., bettas, fancy guppies) as Giant Danios may outcompete them for food or nip at their fins.
Breeding
- Egg scatterers – they do not care for their eggs or fry
- Requires a separate breeding tank with fine-leaved plants or a spawning mop
- Spawning is triggered by warmer temperatures and increased feeding
- Eggs hatch within 24–36 hours, and fry should be fed infusoria or powdered fry food
Interesting Facts
- One of the largest danios, growing significantly bigger than the common Zebra Danio (Danio rerio).
- Known for their rapid movements and playful nature, making them an excellent choice for active community tanks.
- Often used as dither fish to encourage shy species to come out of hiding.