Danio rerio, commonly known as the zebrafish, is a small freshwater fish native to South Asia. It is notable for its distinctive horizontal blue and silver stripes. Zebrafish are known for their regenerative abilities and are widely used in scientific research. They thrive in tropical waters with gentle currents.

Danio rerio, commonly known as the zebrafish, is native to South Asia. Its geographical distribution primarily includes countries such as India, Bangladesh, Nepal, and Bhutan. The species is predominantly found in the Ganges and Brahmaputra river basins.

Zebrafish typically inhabit slow-moving or standing freshwater bodies such as ponds, ditches, and slow-flowing streams. The environmental conditions of their habitat include tropical climates with water temperatures ranging from 24°C to 28°C (75°F to 82°F). The water is often murky and contains a variety of submerged vegetation.

Danio rerio occupies the ecological niche of a small freshwater fish within its native habitat. It is adapted to living in environments where it can find plant detritus and small aquatic organisms to feed on. The species is well-suited for a life in shallow waters where it can easily evade predators and find shelter among aquatic plants.