Ammonia (NH3) is the product of fish respiration and decomposition of excess organic matter. Chemoautotrophic bacteria (Nitrosomonas and Nitrobacter) act in oxidizing ammonium ions (NH4þ) to nitrites (NO2) into nitrate (NO3) ions. In nature, these ions were absorbed by aquatic plants, algae and bacteria as it was assimilated into the biomass as a source of nitrogen. Nitrogenous compounds present in excess amount are responsible for generating eutrophication which disrupt the aquatic ecosystem balance and could leads to massive mortality of aquatic fauna.