As shown in Table 5 Hb, Ht, RBCs and WBCs were not
significantly (P >0.05) affected by the graded levels of yeast
extract used in the study. Fish fed the diet supplemented with
synbiotic (0.48 · 106 CFU g1 and 0.5% yeast extract) showed
the highest values of Hb, RBCs and WBCs.