The Slender Hemiodus is a slim, gregarious, silvery fish with a half black line and a dash of red and yellow in
the tail reminiscent of Denison's (Redline Torpedo) Barb. It is native to floodplain rivers and lakes of the Orinoco and Brazilian Amazon basins.
The "hemi" in its name doesn't refer to the black half line but to "halftooth" (Hemiodontidae); adults have no teeth on their lower jaws.
It can grow to 16cm long. The small adipose fin of the characins is barely visible on their slender bodies.
They are active, fast swimming and shoaling fish that can leap some distance out of the water to evade predators.