Looks Mala to me. There is a huge visual difference between the two, curupira is a much rounder fish and more uniformly coloured. As with alot of Hoplias the underjaw profile is a good place to start. Curupira will have 4 patches of pores along each side of the underjaw. Mala's wil have 4 pores. The lines of the jaw also meet on a Mala and run parralel...ish on a curupira. Have a look in the galleries on my wolf site in my signature below. As well as a good search on MFK should find some good examples.