🐟 AquaticCare difficulty: BeginnerLegal complexity: Low

Zebra danio

Danio rerio · also called Zebrafish, Zebra fish, Striped danio

A hardy, fast-swimming striped shoaling fish that is one of the best beginner aquarium species and a famous scientific model organism. Active, adaptable, and very easy to keep in groups.

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Quick facts

Size	Small; about 4-5 cm (1.6-2 in) total length.
Lifespan	3–5 years
Social needs	group
Native region	South Asia (India, Bangladesh, Nepal, Pakistan; Ganges and Brahmaputra basins)
Origin	Old World
Climate	⛅ Subtropical
Water type	💧 Freshwater
Family	Cyprinidae
Genus	Danio

Part of the Danios

Lively, hardy cyprinids — from tiny nano jewels to fast mid-water shoalers — that do best in active groups and tolerate a range of temperatures, including cooler subtropical setups.

Celestial pearl danio Giant danio White cloud mountain minnow

Sounds & video

🎬 Video

Laser-surgery-of-zebrafish-(Danio-rerio)-embryos-using-femtosecond-laser-pulses-Optimal-parameters-1472-6750-8-7-S1

Kohli V, Elezzabi A · Wikimedia Commons · CC BY 2.0

Habitat & space requirements

From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.

Photo coming soon

Minimum

Cool school tank

20 gal long / 75 L (school of 6+)

Danio rerio is a cool-water (18–24 °C) active schooler — unheated tanks fine in most homes. Group of 6+ minimum, long footprint for sprint-swimming, gentle-to-strong flow.

Photo coming soon

Recommended

Long planted community

29–40 gal / 110–150 L

Larger school of 8–12 in a long planted tank. Active fish — they will harass slow tankmates. Pair with similarly energetic species.

Photo coming soon

Ideal

Asian stream biotope

55 gal+ / 200 L+ biotope

Long biotope with strong flow, smooth substrate, and a large school. Natural sprint-schooling and breeding aggregations visible.

Life & growth stages

How this animal changes through its life — each stage often has its own care, diet and space needs.

Photo coming soon

Egg

Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.

Photo coming soon

Fry

Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.

Photo coming soon

Juvenile

Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.

Adult

Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.

Color & pattern variants

Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.

Natural

Wild / standard zebra →

The naturally occurring form with horizontal dark blue and gold/silver stripes running the length of the body.

representative

Leopard danio →

CommonBeginner

A spotted morph (historically named Danio frankei) in which the stripes break up into a dense field of dark spots; freely interbreeds with zebra danios as the same species.

Tip: Identical care to the zebra; mix leopard and zebra in one school for a varied look since they shoal together without issue.

representative

Wild / standard zebra danio →

CommonBeginner

The wild-type Danio rerio: a slim silver-gold fish with five horizontal dark-blue stripes running the length of the body into the tail.

Tip: One of the hardiest beginner fish, but extremely active — keep a school of 6+ in a longer (not tall) tank with a lid, as they dash and jump.

Selectively bred (man-made)

representative

Longfin zebra →

CommonBeginner

A simple fin-elongation mutation giving flowing, trailing fins over the standard striped pattern.

Tip: The long fins slow them down and tempt nippy tankmates, so house with calm companions and keep water clean to prevent fin rot on the trailing edges.

representative

Golden zebra →

UncommonBeginner

A dilute line with a pale gold-to-cream body and faint, softened stripes, derived from selective breeding for reduced melanin.

Tip: The washed-out stripes make disease spots and ich easier to spot early; otherwise care matches the standard zebra.

representative

GloFish →

CommonBeginner

The original GloFish — Danio rerio engineered with fluorescent-protein genes (Starfire Red, Electric Green, Cosmic Blue, etc.); fluorescence is genetic and inherited.

Tip: Fluorescence shows best under blue/actinic LEDs; breeding or reselling them is prohibited by patent, so keep strictly as a display school.

Habitat & enclosure

Zebra danios are extremely active swimmers and need length more than volume; provide an aquarium of at least 75 L (around 20 gallons) with plenty of open horizontal swimming space. A secure, tight-fitting lid is important because they are accomplished jumpers. Plant the sides and back, leave the center open, and a gentle to moderate current suits their stream origins.

They are remarkably tolerant of varied conditions, accepting a wide pH range (about 6.5-7.5) and temperatures from roughly 18-26 C (64-79 F), which makes them suitable for unheated or coolwater setups in temperate rooms. Stable, clean water and good cycling are all they really require.

Substrate

Any fine gravel or sand is fine; a darker substrate enhances their stripes and reduces stress. They are open-water swimmers and not fussy about the floor.

Equipment & setup

A filter that provides moderate flow suits these stream fish well, paired with standard lighting. They are highly temperature-tolerant (64-77F) and often kept unheated at room temperature; a secure lid prevents these energetic jumpers from escaping.

Diet

Zebra danios are omnivores and enthusiastic, non-fussy feeders. They thrive on quality flakes and micro-pellets supplemented with live and frozen foods such as daphnia, brine shrimp, bloodworms, and mosquito larvae.

Feed small amounts once or twice daily. They feed mainly at the surface and mid-water and will eagerly take almost anything offered, so avoid overfeeding.

Behavior & temperament

These are peaceful but boisterous, perpetually active shoaling fish that must be kept in groups of at least 6-8; in small numbers they can become nippy and stressed. A proper group keeps their energy directed at chasing each other rather than tankmates.

Their fast, darting swimming can intimidate slow or long-finned tankmates, so pair them with similarly active or robust species. Open swimming space and a current to play in provide natural enrichment for this energetic fish.

Health

Zebra danios are among the hardiest aquarium fish but are still susceptible to ich, fin rot, and bacterial infections when stressed or kept in poor water. Their constant activity means they can injure themselves jumping if the tank is uncovered.

Maintain clean, well-cycled water, keep them in adequate groups, and provide a secure lid. Their robustness makes them forgiving for beginners, but quarantine and good husbandry still prevent most problems.

Tips, DIY & hacks

Keep a school of at least 6-8 to satisfy their active, shoaling nature and prevent fin-nipping of slower tankmates. They are extremely hardy and forgiving, making them a classic choice for cycling-cautious beginners, and they spawn readily over marbles or a mesh that protects eggs from being eaten.

Sources

Zebrafish - Wikipedia (wiki)
Danio rerio - Zebra Danio - Seriously Fish (care guide)
Wikipedia: Zebra danio (wiki)