The Enhanced Growth Performance and Antioxidant Capacity of Juvenile <i>Procambarus clarkii</i> Fed with Microbial Antioxidants.

Growth Performance and Whole-Body Proximate Composition After 70 d of feeding using the A1–A5 group diets, the SR of juvenile crayfish in the diet group with added MAs was significantly higher than that of the A1 group, and with an increase in MAs in the diet, FBW, WGR, and SGR showed a trend of increasing and then decreasing, with the highest being in the A4 group, the second highest in the A3 group, and the lowest in the A5 group ( p < 0.05; Table 2 ); the MY was highest in the A4–A5 groups, and the HSI was highest in the A5 group.

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In the hemolymph, the contents of T-AOC, T-SOD, and GSH-PX showed an increasing trend with an increase in MA supplementation, and were all significantly higher in groups A4–A5 than in groups A1–A3 ( p < 0.05; Figure 3 B,D,F); the MDA contents of juvenile crayfish in the MA-supplemented groups were lower than in the control group, and showed a decreasing and then increasing trend, reaching the lowest level in group A4 ( p < 0.05; Figure 3 H). 3.3.

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In the muscles, the LD content and LDH activity began to show a decreasing trend after 14 d of feeding, and were significantly lower in group A5 than in group A1, at 21 d and 28 d ( p < 0.05; Figure 8 D,F); the SDH activity increased significantly at 21 d and 28 d of feeding, and it was significantly higher in group A5 than in group A1, reaching a peak at 21 d ( p < 0.05; Figure 8 H); and there was no significant difference between the two groups for the MDA content ( p > 0.05; Figure 8 B). 4.

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