Zebra Danio

Also known as: Danio rerio

The Zebra Danio is a hardy, energetic freshwater fish known for its distinctive horizontal blue and silver stripes. The Zebra Danio originates from Native to South Asia, including India, Pakistan, Bangladesh, Nepal, and Myanmar, inhabiting slow-moving streams, ponds, and rice paddies with dense vegetation., reaches Adult size: 5-7 cm in captivity, typically lives 3-5 years, and is kept at 18-24°C (64-75°F). Individual fish vary, so treat this as a general guide rather than a guarantee.

Key facts

Lifespan: 3-5 years.
Adult size: Adult size: 5-7 cm (2-2.8 inches).
Temperament: Peaceful, active, and schooling; best kept in groups of 6 or more to reduce stress and encourage natural behavior.
Minimum tank: Minimum 40 liters (10.5 gallons) for a small group; 60+ liters (16+ gallons) recommended for optimal swimming space and stability.
Water temperature: 18-24°C (64-75°F).
pH range: 6.0-8.0.

Species at a glance

Origin: Native to South Asia, including India, Pakistan, Bangladesh, Nepal, and Myanmar, inhabiting slow-moving streams, ponds, and rice paddies with dense vegetation.
Adult size: Adult size: 5-7 cm (2-2.8 inches)
Life span: 3-5 years
Temperament: Peaceful, active, and schooling; best kept in groups of 6 or more to reduce stress and encourage natural behavior.
Tank size: Minimum 40 liters (10.5 gallons) for a small group; 60+ liters (16+ gallons) recommended for optimal swimming space and stability.
Water temp: 18-24°C (64-75°F)
pH range: 6.0-8.0
Diet: Omnivorous; accepts high-quality flakes, micro pellets, and live/frozen foods such as brine shrimp, daphnia, and bloodworms; feed small amounts 2-3 times daily.
Other names: Danio rerio

About the Zebra Danio

The Zebra Danio is a hardy, energetic freshwater fish known for its distinctive horizontal blue and silver stripes. It is one of the most popular beginner fish due to its adaptability and resilience to varying water conditions. Highly social, it thrives in schools and exhibits constant, darting movement throughout the water column. Its prolific breeding habits have also made it a key model organism in scientific research.

Lifespan and health

With proper care, Zebra Danios typically live 3-5 years, though exceptional individuals may reach 5-6 years in pristine conditions; longevity is strongly influenced by diet quality, water stability, and low stress from overcrowding or aggressive tankmates. Common health issues include ich (white spot disease) triggered by sudden temperature drops or poor water quality, fin nipping from incompatible tankmates (especially long-finned varieties), and bacterial infections like columnaris if organic waste accumulates; quarantine new fish for 2-4 weeks and treat outbreaks promptly with appropriate medications while maintaining optimal water parameters.

Overview

Care and tank setup

Tank setup should include a fine gravel or sand substrate, live or artificial plants (such as Java moss or Hornwort) for cover, and open swimming areas; a gentle filter with moderate flow is ideal to mimic natural stream conditions without creating strong currents. Water parameters must be stable: perform 25% weekly water changes, maintain ammonia and nitrite at 0 ppm, and keep nitrate below 20 ppm; use a reliable heater to avoid temperature fluctuations outside the 18-24°C range. Feed a varied diet of high-quality flake food as a staple, supplemented 2-3 times weekly with live or frozen brine shrimp or daphnia to enhance coloration and vitality; avoid overfeeding, as excess food degrades water quality quickly in small tanks.

Adding a Zebra Danio? Research the species’ adult size and temperament carefully, quarantine new fish before introducing them to your tank, and buy from reputable aquarium stores or breeders.

Sources

Breed information on this page is based on the Wikipedia article on the Zebra Danio, supplemented with additional research. Reviewed for accuracy.