There are significant differences in the construction and working of the alimentary system concerning species, habitat, and eating habits of any organism. Fish feed behavior is a major element responsible for their nourishment and development, alteration in the environmental opportunité such as eutrophication as well as anthropogenic activities affect fish species differently and also affect food availability. To understand the digestive system, Morphological studies in the digestive tract of fish were performed on Osteobrama vigorsii (Sykes, 1839). The average length of the alimentary canal is 27.57 cm. The relative intestinal index was calculated to be 1.20 ± 0.085. The alimentary canal is separated into the following regions namely, the buccal cavity (mouth) followed by the orobranchial cavity which opens up into the esophagus. The esophagus opens up into the stomach which leads into the intestines and retained the anus. The intestine shows 5 folds coiled and connected with mesenteries. In this current study osteology of the buccal cavity revolved, that the upper jaw and lower jaw are toothless, as well as palatine teeth are absent. Although the lower jaw displays strong dentary, which at the distal end is broader while it appears tapering towards the proximal end. The lower jaw is devoid of teeth. The oropharyngeal cavity was almost triangular made of strainer gill and pharyngeal teeth apparatus. All gill arches indicate the absence of denticles. Ceratobranchial V indicates the presence of a six oval-shaped tooth plate located on the ventral side of the oropharyngeal cavity.
