Global Journal of Science Frontier Research, D: Agriculture and Veterinary, Volume 23 Issue 4

pH Figure 3: Fortnightly Mean pH of Pond during Experimental Period Figure 3 shows that pH range was favorable during the entire research period. Bryan et al. (2011) concurs that most fish would do better in ponds with a pH near 7.0 and that ponds with a pH less than 6.0 may result in stunting or reduced fish production. Ammonia Figure 4: Fortnightly Ammonia of Pond during Experimental Period Figure 4 shows that ammonia level was in desirable range during the research period. Tumwesigye et al. (2022) The concentration of Ammonia was higher than the 0.6 mg/L reported to kill fish at short exposure and cause damage to gills and kidney cells on chronic exposure. The high concentration of Ammonia in pond could be associated with over-feeding of the fish, irregular de-silting of ponds, and nutrient enrichment from agricultural fields (runoff). 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 pH Date(mm/dd/yyyy) 0 0.01 0.02 0.03 0.04 0.05 0.06 04/07/2021 19/07/2021 03/08/2021 18/08/2021 Ammonia (mg) Date (dd/mm/yy) Global Journal of Science Frontier Research ( D ) XXIII Issue IV Version I Year 2023 36 © 2023 Global Journals Replacement of Fish Meal with Soybean Meal on Growth Performance of Monosex Nile Tilapia ( Oreochromis Niloticus ) Fish Diet