Zebra Danio care guide
Zebra Danio (Danio rerio) — minimum tank 40 L, temperature 18-25 °C, pH 6.5-7.5. Peaceful top-water species.
Compiled by Aquairi from published sources · Published · Updated
Overview
The Zebra Danio (Danio rerio) is a hardy South Asian cyprinid recognised by horizontal blue and silver-gold stripes running the full length of the body. The species is widely used as a vertebrate model organism in genetics and developmental biology research due to its rapid generation time and transparent embryos.
Taxonomy
- Family: Cyprinidae
- Genus: Danio
- Scientific name: Danio rerio
- Common synonyms: Zebrafish
Habitat
Native to the Ganges and Brahmaputra river basins across India, Pakistan, Bangladesh, Nepal and Bhutan. It is typically found in slow-moving or stagnant shallow waters — streams, canals, oxbow lakes, ditches and rice paddies — and tolerates a wide range of temperatures and pH values.
Tank requirements
- Minimum tank volume: 40 L (10.6 US gal)
- Adult size: 4-5 cm
- Temperature: 18-25 °C (64-77 °F)
- pH: 6.5-7.5
- GH: 2-20 °dGH
- Water flow: moderate
- Lifespan: 3-5 years
- School size: ≥6 individuals
Diet
An opportunistic omnivore. Wild diet consists of small aquatic invertebrates, insect larvae and detritus. In aquaria a varied diet of quality flake or micro-pellets supplemented with daphnia, brine shrimp and other small frozen foods supports growth and colour.
Compatibility
A very active schooling species that occupies the upper and middle layers of the tank. Keep a group of six or more. Suitable companions include White Cloud Minnow, peaceful Corydoras, Cherry Barb and Platy. Avoid keeping with long-finned species such as Betta or Angelfish whose fins may be nipped.
Breeding
A productive egg-scatterer that is easy to breed. Females release hundreds of non-adhesive eggs every few days when conditioned and held with males. A bare-bottom breeding tank or a marble substrate prevents adults from eating the eggs. Generation time is approximately three months.
GloFish Zebra Danio Green (Danio rerio) Breeding Guide
Overview
The green GloFish zebra danio is a genetically modified Danio rerio carrying an inserted green fluorescent protein gene (GFP originally extracted from a marine organism, per Wikipedia). It is a patented and trademarked brand; some GloFish reproduce naturally and the fluorescence is heritable, but intentional breeding and any sale, barter or trade of GloFish offspring is strictly prohibited under the licence. Spawning biology is identical to the wild zebra danio, an egg-scattering spawner with no parental care (Seriously Fish).
Sexing
Per Seriously Fish, female zebra danios are typically rounder-bellied, slightly less colourful and a little larger than males, with the difference clearest in spawning condition as males intensify in colour and females fill with eggs.
Conditioning
Condition the adults together on a varied diet including small live and frozen foods, then move conditioned fish to the breeding tank as one or two pairs once the females are full of eggs (Seriously Fish).
Breeding Setup
- Half-filled, very dimly lit breeding tank with a mesh, plastic grass matting or dense Java moss base so eggs fall out of reach (Seriously Fish).
- Slightly acidic to neutral water, towards the upper part of the species' 18-25 C maintenance range.
- A small power filter directing flow along the tank length, swapped for a mature sponge filter after spawning to protect fry.
Spawning Behavior & Trigger
Spawning is triggered by adding small amounts of cool water every few hours and offering small live and frozen foods; pairs typically spawn the following morning, scattering eggs over the base (Seriously Fish). The transgene is inherited normally, so fry from two green GloFish parents fluoresce.
Egg & Fry Care
Adults eat the eggs and are best removed after a couple of days. Incubation takes about 24-36 hours, with the fry free-swimming a few days later. First food is Paramecium or a 5-50 micron proprietary dry food, progressing to Artemia nauplii and microworm as the fry grow (Seriously Fish).
Common Challenges
Beyond egg predation, the key constraint is legal: GloFish are patented and trademarked, and intentional breeding or sale of offspring is prohibited under the brand licence, with the line also restricted in some jurisdictions (Wikipedia). Hobby breeding therefore should not be undertaken for trade.
GloFish Zebra Danio Red (Danio rerio) Breeding Guide
Overview
The red GloFish zebra danio is a genetically modified Danio rerio carrying an inserted fluorescent protein gene (a red protein derived from a sea coral, per Wikipedia). It is a patented and trademarked brand; some GloFish reproduce naturally and the fluorescence is heritable, but the intentional breeding and any sale, barter or trade of GloFish offspring is strictly prohibited under the licence. Spawning biology is identical to the wild zebra danio, which Seriously Fish describes as an egg-scattering spawner with no parental care.
Sexing
Per Seriously Fish, female zebra danios are typically rounder-bellied, slightly less colourful and a little larger than males, with the difference clearest in spawning condition as males intensify in colour and females fill with eggs.
Conditioning
Condition the adults together on a varied diet including small live and frozen foods. Move conditioned fish to the breeding tank as one or two pairs once the females are full of eggs (Seriously Fish).
Breeding Setup
- Half-filled, very dimly lit breeding tank with a mesh, plastic grass matting or dense Java moss base so eggs fall out of reach (Seriously Fish).
- Slightly acidic to neutral water, towards the upper part of the species' 18-25 C maintenance range.
- A small power filter directing flow along the tank length, swapped for a mature sponge filter after spawning to protect fry.
Spawning Behavior & Trigger
Spawning is triggered by adding small amounts of cool water every few hours and offering small live and frozen foods; pairs typically spawn the following morning, scattering eggs over the base (Seriously Fish). The transgene is inherited normally, so fry from two red GloFish parents fluoresce.
Egg & Fry Care
Adults eat the eggs and are best removed after a couple of days. Incubation takes about 24-36 hours, with the fry free-swimming a few days later. First food is Paramecium or a 5-50 micron proprietary dry food, progressing to Artemia nauplii and microworm as the fry grow (Seriously Fish).
Common Challenges
Beyond the usual egg-predation issue, the key constraint is legal: GloFish are patented and trademarked, and intentional breeding or sale of offspring is prohibited under the brand licence, with the line also restricted in some jurisdictions (Wikipedia). Hobby breeding therefore should not be undertaken for trade.
Breeding Zebra Danio
Overview
The Zebra Danio (Danio rerio) is an egg-scattering cyprinid rated beginner-level for breeding, and an excellent choice for those new to breeding fishes. It provides no parental care and may even produce fry naturally in a mature, densely planted tank.
Sexing
Females are rounder-bellied, slightly less colourful and a little larger than males. The difference is especially obvious during spawning, when males intensify in colour and females fill with eggs.
Conditioning the Breeders
Well-conditioned fish should spawn often. Condition them with small amounts of live and frozen foods. Spawning is encouraged by adding small amounts of cool water every few hours.
Breeding Setup
- Container: a small separate tank half-filled with water, very dimly lit
- Egg protection: a mesh base large enough for eggs to fall through but too small for adults to reach, or plastic grass matting / java moss
- Water: slightly acidic to neutral pH
- Temperature: towards the upper end of the species range
- Filtration: a small power filter positioned lengthwise for flow
Spawning Behavior & Trigger
After introducing a conditioned pair, spawning typically occurs the following morning. Eggs are scattered and fall through the protective mesh out of the adults' reach.
Egg & Fry Care
Remove the adults after spawning to prevent egg consumption. Incubation takes 24-36 hours, with the fry becoming free-swimming a few days later. First foods are Paramecium or a proprietary dry food of about 5-50 microns, progressing to Artemia nauplii and microworm as the fry grow.
Common Challenges
The main loss is adults eating their own scattered eggs, which a mesh base prevents. The tiny first-stage fry need very small foods until they are large enough for brine shrimp nauplii.