G. hughi is occasionally available in the ornamental trade and may be labelled ‘chocolate algae eater’.

The original diagnosis of this species by Silas states that it can be identified by the following combination of characters: elongate body form; broad head…

This species is traded under several names including ‘royal danio’, ‘blue-spotted hill trout’, and ‘blue-dotted mirror fish’.

It can be distinguished from congeners by possessing a single row of bluish-green spots along the length of the body, white margins on the dorsal and anal fins, 37-38+1 lateral line scales, and fleshy rudi…