Zebrafish Identification Guide
Recognize this small striped danio by the horizontal blue and silver bands running the length of its body.
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Key identification features
- Small, slender, torpedo-shaped body typically 4-5 cm long
- Alternating horizontal stripes of steel-blue and silvery-gold running from behind the gills onto the tail fin
- Deeply forked caudal fin that continues the striped pattern
- Two pairs of small barbels near the mouth, one maxillary and one rostral
- Slightly upturned mouth suited to feeding at or near the water's surface
Common look-alikes
- Pearl danio: lacks horizontal stripes, instead showing an iridescent pearly sheen over a plain body
- Leopard danio: a spotted color morph of the same species, distinguished by broken spots rather than continuous stripes
- Danio albolineatus (pearl danio group): shows a pinkish-pearl gradient rather than the zebrafish's crisp, high-contrast banding
Where you'll see one
Native to slow-moving streams, rice paddies, and floodplain pools across South Asia, particularly in the Ganges river basin of India, Bangladesh, and Nepal, zebrafish favor shallow, well-vegetated water with a moderate current and often school in large, tightly packed groups near the surface.
Frequently asked questions
How do I tell a zebrafish from a leopard danio?
Look at the pattern: zebrafish show continuous horizontal stripes, while leopard danios display broken spots instead of stripes, even though both are the same species.
What separates zebrafish from a pearl danio?
Zebrafish have bold blue and silver horizontal stripes, whereas pearl danios lack stripes entirely and instead show a smooth, iridescent pearly body color.