Abstract
Forty eight Tocantinsia depressa caught from the Tocantins River were studied. A large extension of the river was sampled, but T. depressa was caught only at ltupiranga and Breu Branco, upstream, of the city of Tucuruí. During the flooding period of the river, when this species was caught, the analysis
of stomach content revealed its omnivorous habit. The food items were basically of allochthonous origin:
fruits, seeds, flowers and animals from the "igapó". Repreduction occurs between November and January,
when the water level of the river is rising. The relationship between standard length (Ls) and total length (Lt) is Ls = 13,05 t 0,8635 Lt and between total weight (Wt) and standard length is: Wt = 7,94 . 10-6 Ls^3,1 859.
