A taxonomic survey of the diatom flora (Bacillariophyceae) of the stomach contens of Myleus sp. (Pacú), of the Lago do Prato, Arquipélago de Anavilhanas - Rio Negro -Amazônia (60° 45'W and 2° 43'S) is presented. There were identified 32 specific and infra-specific taxa, distributed in 10 genera and 5 families. Eunotia were the best represented genera.
Fresh water Diatoms; Bacillariophyceae; Stomach contents, Fishes