The Queen Danio is a small cyprinid of fast-flowing, rocky, tropical forest streams with a sandy substrate. It is a highly active fish, which thrives in well-oxygenated water.

Its body is of typical cyprinid shape, being sleek and slender, with a triangular dorsal fin, large anal fin and relatively large, forked tail. Faint stripes are present along the flanks, and there is a small dark blotch behind the eye. The fins may have a reddish tinge.

It feeds on small worms, aquatic invertebrates and other organic matter.

The Queen Danio occurs in eastern India, Burma, Thailand (including parts of the Mekong Basin), and northern parts of Peninsular Malaysia, including the island of Langkawi.

Fig 1 : Full-grown Queen Danio in clear, shallow, forest stream at Sungei Datai, Langkawi, Peninsular Malaysia.

Fig 2 : Typical habitat comprising fast-flowing rocky stream with shallow pools.  Sungei Datai, Langkawi, Peninsular Malaysia.

Figs 3 and 4 : Small shoals of up to 5 individuals were observed.

Order : Cypriniformes
Family : CYPRINIDAE
Species : Devario regina
Maximum Length : 7.8 cm

References : fishbase.org

Thanks to Kelvin Lim for helping with identification.