Devario is a genus of danios closely related to the familiar zebrafish genus Danio, placed with it in the cyprinid subfamily Danioninae. The atlas covers 44 species ranging from 1.5 in up to 6 in, generally running larger-bodied and more elongated than true Danio, which is part of why the genus carries several of the hobby's classic 'giant' danios. They are stream and river fish of South and Southeast Asia, with atlas records from Myanmar, Laos, India, China, Sri Lanka, Thailand, Bangladesh, and Nepal, typically found in fast-flowing, well-oxygenated water where their torpedo-shaped bodies and upturned mouths suit surface and mid-water feeding on drifting insects.
The giant danio, Devario aequipinnatus, is the genus's aquarium-trade mainstay — a fast, active, easy-to-keep schooling fish that has been a community-tank staple for decades and is often the entry point hobbyists have to the whole danio group. Most other Devario stay in more specialist or scientific circles, though several, like the Bengal danio (D. devario) and queen danio (D. regina), also show up in the trade or in regional fisheries. Conservation status across the genus is only partly resolved — the atlas tally shows 13 species Not Evaluated and 12 Data Deficient out of the 44 covered, alongside 7 Vulnerable and 3 Endangered, consistent with a genus whose smaller-range stream species have not all been formally assessed. The barred danio (D. pathirana), a Sri Lankan endemic, is a well-documented case of a range-restricted Devario under real habitat pressure.