The bagre tigrito Pimelodus pictus is an ornamental fish with great acceptance in international aquarist market: However, it´s basic biology is largerly unknown. A histological and morfometric study of the digestive system of P. pictus was made, in order to contribute to the future design of diets. Seven adult individuals of P. pictus (10 ± 0,5 cm total length) were sacrificed with an overdose of MS-222 (0,5 g/l). The fish were fixed in 4% formaldehyde, during five days at 4 °C. Five μ m thick sections were obtained and stained with H&E. The digestive system presented four layers: mucosae, submucosae, muscular and serosa. The mu- cosae of the esophagus exhibits a stratified squamous epithelium with large number of globet cells. The mucosae of the stomach was constituted by cylindrical simple epithelium. Pyloric and cardiac regions were identified, the latter presenting cardiac glands. This organ presented the thicker muscular layer. The mucosae of the intestine was composed by cylindrical simple epithelium, although the mucosae of this region showed greater area of absorption. The serosa layer in all the evaluated regions was very thin. The stomach well defined and the intestine with few pyloric cecae suggest that P. pictus is a fish with omnivorous habits with preference to animal food.