56 DECEMBER 2024 • WORLD AQUACULTURE • WWW.WAS.ORG • Specific growth rate (SGR, %) = 100 × {ln [final body weight(g)] – ln [initial body weight(g)]} × (number of days).−1 • Length gain = Final length (cm) – Initial length (cm) • Average daily weight gain = [Final weight (g)- Initial weight (g)] × (Days).−1 • Average daily length gain= [Final length (cm)-Initial length (cm)] × (Days).−1 • Survival rate (%) = Number of fish survived × (Initial number of fish).−1 Data were analyzed using one-way ANOVA and statistical differences between the treatments were compared using Tukey’s procedure (TUKEY). The software utilized was the Statistical TABLE 2. Average daily weight and length gains of S. spilurus after 8 weeks rearing under different stocking densities. Treatment group Initial Stocking density (g/day) (cm/day) T1 0.75 PL/L 0.0083±0.0002a 0.0494±0.0002a T2 1.25 PL/L 0.0056±0.0001b 0.0405±0.0008b T3 1.75 PL/L 0.0039±0.0002c 0.0331±0.0011c T4 2.25 PL/L 0.0022±0.0001d 0.0262±0.0008d Results are expressed as mean ± standard deviation of the mean, with all means significantly different (P<0.05). TABLE 3. Specific growth rate of S. spilurus after 8 weeks rearing under different stocking densities. Treatment group Initial Stocking density SGR (%/day) T1 0.75 PL/L 10.96±0.05a T2 1.25 PL/L 10.27±0.05b T3 1.75 PL/L 9.61±0.11c T4 2.25 PL/L 8.60±0.07d Results are expressed as mean ± standard deviation of the mean. Means are significantly different. FIGURE 13. The relationship between stocking density and final mean weight of 61-day old S. spilurus. Means with different letters indicate significant differences between treatments. FIGURE 14. The relationship between stocking density and final mean length of 61-day old S. spilurus. Means with different letters indicate significant differences between treatments. FIGURE 15. The relationship between stocking density and average daily weight gain of S. spilurus fry after 8 weeks rearing. Means with different letters indicate significant differences between treatments. LEFT: FIGURE 16. The relationship between stocking density and average daily length gain of S. spilurus fry after 8 weeks rearing. Means with different letters indicate significant differences between treatments. RIGHT: FIGURE 17. The relationship between stocking density and specific growth rate of S. spilurus fry after 8 weeks rearing. Means with different letters indicate significant differences between treatments.
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