It is a fish of ample distribution, although he is typical for the fishing with bait and possibly it is fished with other modalities, is appreciated by most of the fishermen. It reaches interesting weights, that go from the 3 to the 6 kg .
One is in different types from habitat - in correntosas waters or calm, with muddy or stony bottoms, in the river basins of the Pilcomayo rivers in Formosa, Bermejo and Juramento or Salado in Salta and Salí in Tucumán; and in Average and Inferior, Sweet the Parana rivers in Santiago del Estero,, Average and Inferior Uruguay and de la Plata.
It presents a greenish gray color in all its body, with dark spots of round edges in half of each one of its sides. The form of the body moderately is extended and heavy. It specially has a cavity on the head and a hump behind which its profile curves a little, in older individuals. Their eyes provided with fatty eyelids are remarkable.
Although it is common to confuse them, you row them are different easily from the sábalos by the teeth of his small mouth, in number of six above and down.