Abstract: The physico-chemistry of two fresh water fish ponds was investigated for a duration of 255 days to see the affect of two different doses of inorganic fertilizers (urea and SSP). Both the ponds were treated with fertilizers at the basis of 0.08 and 0.1 % N of body weight of fish daily. Statistically, ammonia, nitrates and biomass were significant in both the treatments. But, temperature, light penetration, pH, electrical conductivity, dissolved oxygen, total alkalinity and total hardness were non-significant. Environmental changes were observed in the pond ecosystem when fertilized with different doses of inorganic fertilizers.