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

Turbidity Figure 5: Fortnightly Turbidity Level of Water in Experimental Period Figure 5 shows the turbidity level of water during experimental period. The number of feeding attempts made by tilapia was not affected by turbidity, suggesting that its propensity to initiate feeding may be higher in turbid water while its overall foraging success may be unaffected (Wing et al., 2021). g) Economic Analysis Analysis of variance on Benefit cost ratio indicated significant difference (p<0.05) among the different treatment means. The higher B: C ratio (1.350±0.11) of feed was recorded in T3 followed by T1 and T2. Along with it, relatively lower B: C ratio was found in treatment four. Poot ‐ López and Gasca ‐ Leyva (2009) when fed meal by partially substituting meal with O. niloticus with tree spinach ( Cnidoscolus chayamansa ) also found substantial reduction in cost of management and operating costs without any negative effect on growth of fish. Subedi et al. (2019) states that in tropical fish production food constitute major expense, so replacement of fishmeal by soyabean based meal would minimize the cost of production by optimizing the cost benefit ratio while scaling up the production. Table 3: Economic Analysis of Benefit-Cost Ratio of Different Treatments at the End of the Experiment Treatment B: C Ratio T1 1.323±0.06 b T2 1.31±0.09 b T3 1.350±0.11 a T4 1.30±0.07 c IV. C onclusion The findings of the present study concluded that there was no significant difference in weight gain by replacing fish meal up to 75% and lowest weight gain was obtained by 100 % fish meal replacement. The total feed cost was minimized by replacing soybean meal in fish meal diet. It can be concluded that fish meal can be replaced upto 75% soybean meal in the diets without decreasing the growth performance and survivability at low cost. Soybean grain should be roasted and dehulled before feeding to inactivate the negative effect of different phytoestrogen activity present in it. A cknowledgement We would like to acknowledge Institute of Agriculture and Animal Sciences (IAAS) and Centre for Aquaculture-Agriculture Research and Production Pvt. Ltd. (CAARP), Khairahani-10, Kathar, Chitwan for opportunity and kind cooperation throughout the study. Conflicts of Interest There are no conflicts of interest. R eferences R éférences R eferencias 1. Abdel-Aziz, M. F. A., H. U. Hassan, A. M., Yones, Y. A. Abdel-Tawwab and A. A. A.T. Metwalli. 2021. Assessing the effect of different feeding frequencies combined with stocking density, initial weight, and dietary protein ratio on the growth performance of tilapia, catfish and carp. Scientific African, 12 (e00806). 2. Agbo, N., D. Adjei-Boateng and K. Jauncey. 2011. The potential of groundnut ( Arachis hypogaea L. ) by-products as alternative protein sources in the 0 5 10 15 20 25 30 35 04/07/2021 19/07/2021 03/08/2021 18/08/2021 Depth (cm) Date (dd/mm/yy) Global Journal of Science Frontier Research ( D ) XXIII Issue IV Version I Year 2023 37 © 2023 Global Journals Replacement of Fish Meal with Soybean Meal on Growth Performance of Monosex Nile Tilapia ( Oreochromis Niloticus ) Fish Diet