Betta ferox

A deep body with reddish-brown flanks and a whitish belly, a black lower-jaw band and a second stripe behind the eye.

A deep body with reddish-brown flanks and a whitish belly, a black lower-jaw band and a second stripe behind the eye. The crossbarred tail is lance-shaped; the anal and caudal fins lack broad black margins.

Adult length

Up to 6.3 cm (standard length, without the tail fin)

Natural habitat

Inhabits small rivers over gravel and sand, using slower margins among roots and plants.

Wild habitat measured 23.3–24.2°C (25.5°C at another time) and pH 5.8–6.3.