Bryconops melanurus, sometimes called the tail-light tetra, is a small species of freshwater fish from South America that primarily preys on insects.

[2] The head is slender, with a pointed snout, and B. melanurus lacks a humeral spot of the kind frequently seen in congeners (such as B. humeralis and B.

There is a dark stripe about the width of the pupil that veers from the center of this fin up towards the dorsal lobe, and the caudal-fin margins are dusky.

[8] B. melanurus is also known to be similar to B. cytogaster, but cyrtogaster has a deeper body and a greater number of anal-fin rays (30-31).

[11][12][13] It should not be confused with the head-and-tail light tetra, Hemigrammus ocellifer, which is a different fish in the same order, Characiformes.

[5][14] (In modern taxonomy, the name Salmo applies to a genus in the family Salmonidae that encompasses trout and salmon from Europe.