International Journal of Aquaculture, 2025, Vol.15, No.3, 155-164 http://www.aquapublisher.com/index.php/ija 161 Figure 7 Comparison of final total length between treatments, carcass composition (Meat yield) Carcass analysis revealed that Treatment 2 (on-farm-made feed) resulted in a higher meat yield (45.5%) compared to Treatment 1 (commercial feed, 37%) (Table 2). Table 2 Carcass yield of O. andersonii reared on commercial and on-farm formulated diets Treatment Initial weight (plus the bones and offal) (%) Final weight (meat yield) (%) T1 62 37 T2 66 45.5 3.3 Feed conversion ratio The analysis revealed significant differences (P≤ 0.05) between the two treatments, Treatment 1 had a better utilization of the feed (1.9) than treatment 2 (1.5). 3.4 Survival rates (%) = ℎ / ℎ × 100 In all the three (3) replicates for treatment 1, a total number of 30 had survived out of 30 fish, therefore, the survival rate was calculated as: Survival rate T1= (30÷30) ×100 = 100%. In all the three (3) replicates for treatment 2, a total number of 30 had survived out of 30 fish, therefore, the survival rate was calculated as:Survival rate T2= (30÷30) ×100 = 100%. 3.5 Specific growth rate SGR was calculated using the formula: SGR = (ln (Final weight (g) － ln (Initial weight (g) ×100) T (In days) SGR for treatment one: SGR = (ln (458.4 (g) － ln (90(g) / 62 × 100=2.6. SGR for treatment two: SGR = (ln (425.8(g) － ln (90(g) / 62 × 100=2.5. 3.6 Mean weight gain MWG for treatment one was: = 425.8 g － 90g ÷ 30 × 100 = 1 120 g. MWG for treatment two: = 458.4 g － 90g ÷ 30 × 100 = 1 228 g. 3.7 Water quality parameters The mean water quality parameters during the entire experimental period (Table 3). Table 3 Mean value (±SD) of water quality parameters sampled four times for each month Months Water temperature (°C) Dissolved oxygen (mg/L) pH March 25.34±0.76 5.92±0.94 8.39±0.06 April 26.56±0.51 6.01±1.03 8.42±0.02 May 24.46±0.82 5.59±1.17 8.50±0.03 Note: the mean values (±SD) were recorded as constant across the two treatments
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