The threadfin rainbowfish is a small unusual fish with a long thin body and a very small mouth. The males are easily recognised by long feathery fins when mature and grow to an approximate total length of 6 cm. Females are smaller and grow to approximately 4cm total length. The Gulbuwangay River form has nice colouration, black fins with some yellow at the base of the second dorsal fin and anal fin with the first dorsal fin black containing a reasonable proportion of red. The body is silvery brown sometimes with several darker vertical bands. 

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