The present paper makes a record for the occurrence of a freshwater prawn Macrobrachium dayanum in a wetland ecosystem of Tripura during March 2016 to February 2018. During two year study period, prawn population followed a definite rhythm of seasonal variations showing highest density(76 u/m3) in the winter and lowest (18 u/m3) during summer. Numerical abundance of Macrobrachium dayanum was observed in and around the peripheral root area of Eichhornia crassipes. Notable physico-chemical factors of the studied wetland were also observed and their degree of influence over the seasonal abundance of prawns was noted. The simple correlation coefficient shows that water temperature has negative and significant correlation(r = - 9431, P<0.01) with the abundance of total prawns. However, stepwise multiple regression analysis depicted that water temperature (P<0.01), pH (P<0.05), dissolved oxygen (P<0.05), dissolved organic matter (P<0.01) and phosphate phosphorus (P<0.01) have significant correlation with the abundance of total prawns.
