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

Figure 1: Fortnightly Mean Temperature (°C) during Experimental Period Figure 1 shows that mean temperature at morning, afternoon and evening in pond which was in desirable range. Average temperature requirement for tilapia culture is in range of 20- 32°C. Makori et al. (2017) give a range of between 20 and 35 °C as ideal for tilapia culture. Figure 2: Fortnightly Dissolved Oxygen of Pond during Experimental Period Figure 2 shows that dissolved oxygen level was at desirable range throughout the culture period. Makori et al. (2017) in his research found that tilapia can grow best in level of 5mg/l. Generally, fish growth and yields are greater in ponds with higher DO concentration (Bar- tholomew, 2010). 28 29 30 31 32 33 1 2 3 4 Temperature (ºC) Cultural Period 6am 2pm 6pm 5 5.4 5.8 6.2 6.6 7 7.4 7.8 1 2 3 4 Dissolved Oxygen(mg/l) Cultural Period 6am 2pm 6pm Global Journal of Science Frontier Research ( D ) XXIII Issue IV Version I Year 2023 35 © 2023 Global Journals Replacement of Fish Meal with Soybean Meal on Growth Performance of Monosex Nile Tilapia ( Oreochromis Niloticus ) Fish Diet f) Dissolved Oxygen Dissolved oxygen (DO) is a critical environ- mental indicator in aquaculture. Depleted DO is the leading cause of fish kills, and fish farmers know that low-oxygen conditions are their worst enemy.