The hematological indices of the juvenile Nile tilapia fed the experimental diets are shown in Table 5. While there were no significant differences in Hb and Ht among treatment diets, fish fed the diet supplemented with either inulin or JA had significantly higher RBC compared with that of fish fed the control diet (P < 0.05). To study how dietary inulin or JA affects metabolic feed utilization, several blood chemical parameters in experimental fish were examined in Table 6. While dietary supplementation with either inulin or JA did not affect blood triglyceride, cholesterol, BUN, T-bilirubin, D-bilirubin, SGOT, SGPT, and chloride contents, they did modulate several other blood parameters. For instance, both inulin and JA supplementation led to significantly increased blood glucose and albumin levels (P < 0.05) and increased total protein in blood, although significant enhancement in the latter was observed only in fish fed diets supplemented with JA (P < 0.05).