The Astyanax pelecus lives in the benthopelagic, freshwater, depth range 0 - 1 m environment.
Astyanax pelecus has a humeral spot above the lateral line, as well as a dark stripe running along the middle of its flanks from the edge of the gill cover to the base of the tail. More
Astyanax pelecus is known from the upper rio Pardo drainage, at C More