10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 1 2015 (January - March) Fish are a rich source of proteins beneficial to heart and eyes. Being perishable, they are processed immediately after collection. Water consumption in fish-processing industry is very large and high strength wastewaters rich in salts, ammoniacal nitrogen (NH lessThan sub greaterThan 3 lessThan /sub greaterThan -N), organic load are generated which cannot be discharged without any treatment. The present investigation describes development of bioaugmentation process to reduce the concentration of NH lessThan sub greaterThan 3 lessThan /sub greaterThan -N upto the drinking water level from the wastewater arising from an Up flow Anaerobic Sludge Blanket Reactor. Culture of lessThan i greaterThan Bacillus lessThan /i greaterThan sp. was efficient in lowering the NH lessThan sub greaterThan 3 lessThan /sub greaterThan -N content of the wastewater from initial 370 mg/L up to 4 mg/L within 5 days of incubation at ambient temperature (28±2 ºC). At bench scale level, the culture reduced the NH lessThan sub greaterThan 3 lessThan /sub greaterThan -N content upto 60 mg/L from initial 558 mg/L. Thus, lessThan i greaterThan Bacillus lessThan /i greaterThan sp. can be used successfully for developing a bioaugmentation process for removing NH lessThan sub greaterThan 3 lessThan /sub greaterThan -N from wastewater generated in fish processing industry. S.S. SARNAIK, V.V. PHALKE AND P.P. KANEKAR Bioaugmentation process; Fish processing industry; Bacillus sp.; Ammoniacal nitrogen (NH3-N) 1021-1029