Yusuf, Ibrahim, Asmau Rabiu Gamawa, and Musa Haruna. 2023. “Oxidation of Ammonia in Fish Ponds to Nitrates Using Free and Immobilized Nitrifying Bacteria: Enhancing Fish Pond Water Quality With Free and Immobilized Bacteria”. UMYU Journal of Microbiology Research (UJMR) 8 (2):236-45. https://doi.org/10.47430/ujmr.2382.027.