Intensive aquaculture is becoming more affordable leading to higher risks of environmental impacts. Gondwe et al. (2012) and Vezzulli et al. (2008) indicated that aquaculture is the major contributor to the increasing levels of organic waste and toxic compounds. Without proper treatment, aquaculture waste would potentially cause newly emerging diseases due to antibiotic resistance and harmful algal bloom (Hegaret, 2008; Rubert, 2008). Wastewater effluent from aquaculture industry contains dissolved organic carbon which may lead to environmental deterioration at high concentration (Ali et al., 2005). Ammonia (NH3) is the product of fish respiration and decomposition of excess organic matter. Chemoautotrophic bacteria (Nitrosomonas and Nitrobacter) act in oxidizing ammonium ions (NH4
þ) to nitrites (NO2)into nitrate (NO3) ions. In nature, these ions were absorbedby aquatic plants, algae and bacteria as it was assimilated into thebiomass as a source of nitrogen. Nitrogenous compounds present inexcess amount are responsible for generating eutrophication which disrupt the aquatic ecosystem balance and could leads to massive mortality of aquatic fauna