The purpose of this study was to obtain an overview of the biological aspects of food and obtain the data base on some parameters of the gastrointestinal tract of golden puffer fish (Tetraodon fluviatilis) from estuary waters of Bengkalis, Riau. Organisms which were found from the stomach of golden puffer fish were identified using Sachlan(1974) and Kottelat et al. (1993). The ratio of stom…