Valuable source of high-quality protein in human diet is fish which is the most wanted food stuff for the popular societies in the world. A study was made up for one year (January 2015- December 2015) to understand the proximate composition in different seasons. Three different fishes such as Oreochromis mossambicus, Mugil cephalus and Lates calcarifer were collected from different regions of the study area and their proximate composition was analyzed in different seasons. Pre-monsoon season proved to be the best in all composition in three species of fishes. Protein content showed highest 20.46±0.26% in Lates calcarifer then 15.65±0.29% in Oreochromis mossambicus and 18.59±0.29% in Mugil cephalus.