The LWR was derived from 120 TGGG hybrid grouper samples. The TLs of the samples ranged from 18 to 24 cm and the BWs of the samples ranged from 138 to 270 g. Figure 1 shows the nonlinear fit of the LWR of the TGGG hybrid grouper, whereas Table 1 presents the regression coefficients b of the log-transformed variables and the growth type of the TGGG hybrid grouper. The TGGG hybrid grouper exhibited a negative allometric growth (b < 3) in IM (0 day) at all experimental temperatures and diets, which indicated that the fish became lighter with increasing size. A similar growth pattern was also observed in FM (30 d) under 22°C (p > 0.05, df = 13, S.E. = 0.063) and 34°C (p > 0.05, df = 13, S.E. = 0.101) for both diets. Conversely, in FM, the fish demonstrated an isometric growth (b = 3) at 26 °C when fed on pellet (p < 0.05, df = 13, S.E. = 0.108) and shrimp diets (p < 0.05, df = 13, S.E. = 0.202) and at 30°C when fed on the pellet diet (p < 0.05, df = 13, S.E. = 0.01), thereby indicating that the shape of the fish did not change with increasing weight and length. A positive allometric growth (b > 3) was observed at 30°C for shrimp-fed fish (p < 0.05, df = 13, S.E. = 0.118), which indicated that the fish became heavier as they increased in length and size. ANCOVA analysis showed significant differences (p<0.05) between the slopes of IM and FM only at temperatures of 26°C and 30°C, whereas no significant differences (p>0.05) were observed at other temperatures (Table 1). The regression model fitting in IM and FM showed that TL and BW of the TGGG hybrid grouper were highly correlated (r2 = 0.94–0.99).
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