The Nandus mercatus lives in the pelagic, freshwater, pH range: 4.3 environment.
named Nandus mercatus has been described from the Musi River drainage in southern Sumatra in a recent issue of the journal Zootaxa. More
Nandus mercatus is distinguished from other members of the genus in having a combination of: body depth 43.0–43.2% standard length, 15 pectoral-fin rays, 29–32 lateral line scales, 11–12 scale rows below the lateral line, and a slightly concave predorsal profile. More