The giant danio (Devario aequipinnatus) is a species of freshwater ray-finned fish belonging to the family Danionidae.

Originating in Sri Lanka, Nepal, and the west coast of India, this species grows to a maximum length of 4–6 inches (10–15 cm), making it one of the largest of the danionins.

In the wild, giant danios live in clear streams and rivers among hills at elevations up to 1000 ft (300 m) above sea level.

As surface dwellers, their diets consist predominantly of exogenous insects, but is also supplemented by worms and crustaceans.

Giant danios appreciate water movement to simulate the motion of the rivers and fast-moving streams of their origins, and prefer to school.

Their flashy coloration combined with an active swimming style and shoaling behavior have enticed many fishkeepers to include this species in their displays.

It is recommended this species be kept in a tank that is at least 48" (appx 4 ft long) and include ample open swimming space.

[5] Giant Danios are a tropical fish species and require a tanks water temperature to be at least 70 - 80 degrees F. Their lifespan is on average 5-7 years in captivity, and the ideal pH level is anywhere from 6.0 to 8.0.