Danio rerio
The zebrafish is one of the world’s most familiar aquarium fish and a major lab model organism. Wild-type fish show bold blue and silver horizontal stripes and are extremely hardy, tolerating a wide temperature range—including unheated indoor tanks in mild climates. They are active, fast shoalers that prefer open water in the upper and middle levels. Egg scatterers that release adhesive eggs among plants or substrate; no parental care. Long-finned and colour morphs are common in trade.
Flake or micro pellets; frozen daphnia or brine shrimp; small frequent meals suit their high activity.
Frequency: 1–2× daily
Very unfussy; avoid overfeeding in small tanks.
Native Region: South Asia (eastern India, Bangladesh, Himalayan foothills)
Streams and pools with vegetation; seasonal floodplains.
Long tank with swimming length; gentle flow; avoid slow long-finned tankmates (nipping possible).
Activity Level: High
Schooling Size: 6+ recommended
Constant motion; tight school when threatened; may nip very flowing fins.
Difficulty: Easy
Type: Egg scatterer
Sexual Dimorphism: Females deeper-bodied; males slimmer and may show slight golden tone.
Scatter eggs at dawn; marble or grass-mat method common; remove adults after spawning.
Substrate: Either
Plant Safe: Yes
Fine-leaved plants for egg scattering; open water for shoaling.
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