It is not appreciated by its meat, safe in the smoked case of in the units of more than 3 kg, but one has prevailed however as sport fish by the decision whereupon attacks the artificial decoys, specially silver-plated ondulantes spoons and some flying ones. The most appropriate hour is the one of the fall of the sun in the stream confluences or brooks, specially in the zone of current calm or crosscurrent. It has a somewhat ferocious aspect due to its two very prominent eyeteeth and acute in inferior maxilar that penetrates and they comply in a type of case in superior maxilar. Its head is very small in relation to the body, that is very long and tablet. It has great eyes, prominent jaw and narrows, with the ample and oblique descendent buccal opening. Is known vulgarly it, according to the zones, with the denominations of "Machete", "Toothy", "Swordfish", "Pyre" or "Puppy" in Brazil.

The color of the body is silverplated, with the dark back but. It reaches a length of to a meter and gets to surpass the 6 kg of weight.

It is distributed in the parano-platense river basin and it lays eggs between the months of January and March in the zone of Average the Uruguay river.

It is a voracious pregiver, that mainly feeds on mojarras and other small fish. Is not used it as food in spite of its size by the great amount of thorns that it has.